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b2598d3092
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2
.gitignore
vendored
2
.gitignore
vendored
@ -36,3 +36,5 @@ Thumbs.db
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*.swo
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.vscode/
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.idea/
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*.sty
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.DS_Store
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@ -18,9 +18,10 @@ conditions and procedural guidance.
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% Gap
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This reliance on human operators prevents autonomous control capabilities and
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creates a fundamental economic challenge for next-generation reactor
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designs.\splitsuggest{The ``and'' here joins two distinct issues (autonomy
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barrier + economics). Consider making the causal link explicit: ``This reliance
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on human operators not only prevents autonomous control capabilities but also
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designs.
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\splitinline{The ``and'' here joins two distinct issues (autonomy barrier +
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economics). Consider making the causal link explicit: ``This reliance on human
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operators not only prevents autonomous control capabilities but also
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creates...'' or split into two sentences.}
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Small modular reactors, in particular, face per-megawatt staffing costs far
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exceeding those of conventional plants and threaten their economic viability.
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@ -28,10 +29,11 @@ exceeding those of conventional plants and threaten their economic viability.
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% Critical Need
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What is needed is a method to create autonomous control systems that safely
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manage complex operational sequences with the same assurance as human-operated
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systems, but without constant human supervision.\splitpolish{``What is needed
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is'' — Gopen would call this a weak topic position. The sentence buries the
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subject. Try: ``Autonomous control systems must safely manage complex
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operational sequences...'' Puts the actor in the topic position.}
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systems, but without constant human supervision.
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\splitinline{``What is needed is'' — Gopen would call this a weak topic
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position. The sentence buries the subject. Try: ``Autonomous control systems
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must safely manage complex operational sequences...'' Puts the actor in the
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topic position.}
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% APPROACH PARAGRAPH Solution
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To address this need, we will combine formal methods with control theory to
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build hybrid control systems that are correct by construction.
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@ -60,9 +62,10 @@ maintaining the high safety standards required by the industry.
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This work is conducted within the University of Pittsburgh Cyber Energy Center,
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which provides access to industry collaboration and Emerson control hardware,
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ensuring that developed solutions align with practical implementation
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requirements.\splitsuggest{This qualifications paragraph feels orphaned here.
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It's important context but reads as an afterthought. Consider integrating it
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into the approach paragraph (``...demonstrated on Emerson hardware through our
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requirements.
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\splitinline{This qualifications paragraph feels orphaned here. It's important
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context but reads as an afterthought. Consider integrating it into the
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approach paragraph (``...demonstrated on Emerson hardware through our
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partnership with the Cyber Energy Center'') or moving to a ``Why This Will
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Succeed'' framing later.}
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@ -7,19 +7,23 @@ correct behavior.\splitnote{Strong, direct opening. Sets scope immediately.}
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Nuclear power relies on extensively trained operators who follow detailed
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written procedures to manage reactor control. Based on these procedures and
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operators' interpretation of plant conditions, operators make critical decisions
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about when to switch between control objectives.\splitsuggest{Consider:
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``operators'' appears 3x in two sentences. Maybe: ``Based on these procedures
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and their interpretation of plant conditions, they make critical decisions...''}
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about when to switch between control objectives.
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\splitinline{Consider: ``operators'' appears 3x in two sentences. Maybe:
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``Based on these procedures and their interpretation of plant conditions,
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they make critical decisions...''}
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% Gap
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But, reliance on human operators has created an economic challenge for
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next-generation nuclear power plants.\splitpolish{``But, reliance'' — the comma
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after ``But'' is unusual. Either drop it or restructure: ``However, this
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reliance...'' or ``This reliance, however, has created...''} Small modular
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reactors face significantly higher per-megawatt staffing costs than conventional
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next-generation nuclear power plants.
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\splitinline{``But, reliance'' — the comma after ``But'' is unusual. Either
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drop it or restructure: ``However, this reliance...'' or ``This reliance,
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however, has created...''}
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Small modular reactors face significantly higher per-megawatt staffing costs
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than conventional
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plants. Autonomous control systems are needed that can safely manage complex
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operational sequences with the same assurance as human-operated systems, but
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without constant supervision.\splitsuggest{``are needed that can'' — passive.
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Try: ``Autonomous control systems must safely manage...''}
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without constant supervision.
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\splitinline{``are needed that can'' — passive. Try: ``Autonomous control
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systems must safely manage...''}
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% APPROACH PARAGRAPH Solution
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To address this need, we will combine formal methods from computer science with
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@ -49,14 +53,16 @@ certificates to prove that mode transitions occur safely and as defined by the
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deterministic automata. This compositional approach enables local verification
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of continuous modes without requiring global trajectory analysis across the
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entire hybrid system. We will demonstrate this on an Emerson Ovation control
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system.\splitsuggest{This paragraph is dense. Consider breaking after the
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three stages, then a new paragraph for the compositional verification point
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and Emerson demo.}
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system.
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\splitinline{This paragraph is dense. Consider breaking after the three
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stages, then a new paragraph for the compositional verification point and
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Emerson demo.}
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% Pay-off
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This approach will demonstrate autonomous control can be used for complex
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nuclear power operations while maintaining safety
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guarantees.\splitpolish{``can be used for'' — weak. Try: ``...will demonstrate
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that autonomous control can manage complex nuclear power operations while
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guarantees.
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\splitinline{``can be used for'' — weak. Try: ``...will demonstrate that
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autonomous control can manage complex nuclear power operations while
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maintaining safety guarantees.'' Or even stronger: ``...enables autonomous
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management of complex nuclear power operations with safety guarantees.''}
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@ -1,165 +0,0 @@
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\section{State of the Art and Limits of Current Practice}
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The principal aim of this research is to create autonomous reactor control
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systems that are tractably safe. To understand what is being automated, we must
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first understand how nuclear reactors are operated today. This section examines
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reactor operators and the operating procedures we aim to leverage, then
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investigates limitations of human-based operation, and concludes with current
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formal methods approaches to reactor control systems.
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\subsection{Current Reactor Procedures and Operation}
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Nuclear plant procedures exist in a hierarchy: normal operating procedures for
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routine operations, abnormal operating procedures for off-normal conditions,
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Emergency Operating Procedures (EOPs) for design-basis accidents, Severe
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Accident Management Guidelines (SAMGs) for beyond-design-basis events, and
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Extensive Damage Mitigation Guidelines (EDMGs) for catastrophic damage
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scenarios. These procedures must comply with 10 CFR 50.34(b)(6)(ii) and are
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developed using guidance from NUREG-0900~\cite{NUREG-0899, 10CFR50.34}, but their
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development relies fundamentally on expert judgment and simulator validation
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rather than formal verification. Procedures undergo technical evaluation,
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simulator validation testing, and biennial review as part of operator
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requalification under 10 CFR 55.59~\cite{10CFR55.59}. Despite this rigor,
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procedures fundamentally lack formal verification of key safety properties. No
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mathematical proof exists that procedures cover all possible plant states, that
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required actions can be completed within available timeframes, or that
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transitions between procedure sets maintain safety invariants.
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\textbf{LIMITATION:} \textit{Procedures lack formal verification of correctness
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and completeness.} Current procedure development relies on expert judgment and
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simulator validation. No mathematical proof exists that procedures cover all
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possible plant states, that required actions can be completed within available
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timeframes, or that transitions between procedure sets maintain safety
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invariants. Paper-based procedures cannot ensure correct application, and even
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computer-based procedure systems lack the formal guarantees that automated
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reasoning could provide.
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Nuclear plants operate with multiple control modes: automatic control, where the
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reactor control system maintains target parameters through continuous reactivity
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adjustment; manual control, where operators directly manipulate the reactor; and
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various intermediate modes. In typical pressurized water reactor operation, the
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reactor control system automatically maintains a floating average temperature
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and compensates for power demand changes through reactivity feedback loops
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alone. Safety systems, by contrast, operate with implemented automation. Reactor
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Protection Systems trip automatically on safety signals with millisecond
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response times, and engineered safety features actuate automatically on accident
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signals without operator action required.
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The division between automated and human-controlled functions reveals the
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fundamental challenge of hybrid control. Highly automated systems handle reactor
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protection---automatic trips on safety parameters, emergency core cooling
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actuation, containment isolation, and basic process
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control~\cite{WRPS.Description, gentillon_westinghouse_1999}. Human operators,
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however, retain control of strategic decision-making: power level changes,
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startup/shutdown sequences, mode transitions, and procedure implementation.
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\subsection{Human Factors in Nuclear Accidents}
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Current-generation nuclear power plants employ over 3,600 active NRC-licensed
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reactor operators in the United States~\cite{operator_statistics}. These
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operators divide into Reactor Operators (ROs), who manipulate reactor controls,
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and Senior Reactor Operators (SROs), who direct plant operations and serve as
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shift supervisors~\cite{10CFR55}. Staffing typically requires at least two ROs
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and one SRO for current-generation units~\cite{10CFR50.54}. Becoming a reactor
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operator requires several years of training.
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The persistent role of human error in nuclear safety incidents---despite decades
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of improvements in training and procedures---provides the most compelling
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motivation for formal automated control with mathematical safety guarantees.
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Operators hold legal authority under 10 CFR Part 55 to make critical decisions,
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including departing from normal regulations during emergencies. The Three Mile
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Island (TMI) accident demonstrated how a combination of personnel error, design
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deficiencies, and component failures led to partial meltdown when operators
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misread confusing and contradictory readings and shut off the emergency water
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system~\cite{Kemeny1979}. The President's Commission on TMI identified a
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fundamental ambiguity: placing responsibility for safe power plant operations on
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the licensee without formal verification that operators can fulfill this
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responsibility does not guarantee safety. This tension between operational
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flexibility and safety assurance remains unresolved: the person responsible for
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reactor safety is often the root cause of failures.
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Multiple independent analyses converge on a striking statistic: 70--80\% of
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nuclear power plant events are attributed to human error, versus approximately
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20\% to equipment failures~\cite{WNA2020}. More significantly, the root cause of
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all severe accidents at nuclear power plants---Three Mile Island, Chernobyl, and
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Fukushima Daiichi---has been identified as poor safety management and safety
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culture: primarily human factors~\cite{hogberg_root_2013}. A detailed analysis
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||||
of 190 events at Chinese nuclear power plants from
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||||
2007--2020~\cite{zhang_analysis_2025} found that 53\% of events involved active
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||||
errors, while 92\% were associated with latent errors---organizational and
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||||
systemic weaknesses that create conditions for failure.
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||||
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||||
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||||
\textbf{LIMITATION:} \textit{Human factors impose fundamental reliability limits
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||||
that cannot be overcome through training alone.} The persistent human
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error contribution despite four decades of improvements demonstrates that these
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limitations are fundamental rather than a remediable part of human-driven control.
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\subsection{HARDENS and Formal Methods}
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The High Assurance Rigorous Digital Engineering for Nuclear Safety (HARDENS)
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project represents the most advanced application of formal methods to nuclear
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reactor control systems to date~\cite{Kiniry2024}.
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HARDENS aimed to address a fundamental dilemma: existing U.S. nuclear control
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rooms rely on analog technologies from the 1950s--60s. This technology is
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||||
obsolete compared to modern control systems and incurs significant risk and
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cost. The NRC contracted Galois, a formal methods firm, to demonstrate that
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Model-Based Systems Engineering and formal methods could design, verify, and
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implement a complex protection system meeting regulatory criteria at a fraction
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of typical cost. The project delivered a Reactor Trip System (RTS)
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implementation with full traceability from NRC Request for Proposals and IEEE
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standards through formal architecture specifications to verified software.
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HARDENS employed formal methods tools and techniques across the verification
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hierarchy. High-level specifications used Lando, SysMLv2, and FRET (NASA Formal
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Requirements Elicitation Tool) to capture stakeholder requirements, domain
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engineering, certification requirements, and safety requirements. Requirements
|
||||
were analyzed for consistency, completeness, and realizability using SAT and SMT
|
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solvers. Executable formal models used Cryptol to create a behavioral model of
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the entire RTS, including all subsystems, components, and limited digital twin
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models of sensors, actuators, and compute infrastructure. Automatic code
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synthesis generated verifiable C implementations and SystemVerilog hardware
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implementations directly from Cryptol models---eliminating the traditional gap
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between specification and implementation where errors commonly arise.
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Despite its accomplishments, HARDENS has a fundamental limitation directly
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||||
relevant to hybrid control synthesis: the project addressed only discrete
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digital control logic without modeling or verifying continuous reactor dynamics.
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The Reactor Trip System specification and verification covered discrete state
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transitions (trip/no-trip decisions), digital sensor input processing through
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discrete logic, and discrete actuation outputs (reactor trip commands). The
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project did not address continuous dynamics of nuclear reactor physics. Real
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reactor safety depends on the interaction between continuous
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processes---temperature, pressure, neutron flux---evolving in response to
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discrete control decisions. HARDENS verified the discrete controller in
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isolation but not the closed-loop hybrid system behavior.
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\textbf{LIMITATION:} \textit{HARDENS addressed discrete control logic without
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continuous dynamics or hybrid system verification.} Verifying discrete control
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logic alone provides no guarantee that the closed-loop system exhibits desired
|
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continuous behavior such as stability, convergence to setpoints, or maintained
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safety margins.
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HARDENS produced a demonstrator system at Technology Readiness Level 2--3
|
||||
(analytical proof of concept with laboratory breadboard validation) rather than
|
||||
a deployment-ready system validated through extended operational testing. The
|
||||
NRC Final Report explicitly notes~\cite{Kiniry2024} that all material is
|
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considered in development, not a finalized product, and that ``The demonstration
|
||||
of its technical soundness was to be at a level consistent with satisfaction of
|
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the current regulatory criteria, although with no explicit demonstration of how
|
||||
regulatory requirements are met.'' The project did not include deployment in
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actual nuclear facilities, testing with real reactor systems under operational
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conditions, side-by-side validation with operational analog RTS systems,
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systematic failure mode testing (radiation effects, electromagnetic
|
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interference, temperature extremes), NRC licensing review, or human factors
|
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validation with licensed operators in realistic control room scenarios.
|
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\textbf{LIMITATION:} \textit{HARDENS achieved TRL 2--3 without experimental
|
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validation.} While formal verification provides mathematical correctness
|
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guarantees for the implemented discrete logic, the gap between formal
|
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verification and actual system deployment involves myriad practical
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considerations: integration with legacy systems, long-term reliability
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under harsh environments, human-system interaction in realistic
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operational contexts, and regulatory acceptance of formal methods as
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primary assurance evidence.
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@ -33,7 +33,10 @@ verification techniques designed for purely discrete or purely continuous
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systems cannot handle this interaction directly.\splitpolish{Missing space before ``Our} Our methodology addresses this
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challenge through decomposition. We verify discrete switching logic and
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continuous mode behavior separately, then compose these guarantees to reason
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about the complete hybrid system. This two-layer approach mirrors the structure
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about the complete hybrid system.\splitsuggest{Compositional verification claim
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needs citation. See assume-guarantee literature (Henzinger, Alur). None of the
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NEEDS\_REVIEWED papers directly prove this composition is sound for your
|
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specific approach.} This two-layer approach mirrors the structure
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of reactor operations themselves: discrete supervisory logic determines which
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control mode is active, while continuous controllers govern plant behavior
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within each mode.
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@ -75,7 +78,7 @@ The creation of a HAHACS amounts to the construction of such a tuple together
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with proof artifacts demonstrating that the intended behavior of the control
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system is satisfied by its actual implementation. This approach is tractable now
|
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because the infrastructure for each component has matured. The novelty is not in
|
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the individual pieces, but in the architecture that connects them.\splitnote{This is your key insight — the novelty is compositional, not component-level.} By defining
|
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the individual pieces, but in the architecture that connects them.\splitnote{This is your key insight --- the novelty is compositional, not component-level.} By defining
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entry, exit, and safety conditions at the discrete level first, we transform the
|
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intractable problem of global hybrid verification into a collection of local
|
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verification problems with clear interfaces. Verification is performed per mode
|
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@ -247,7 +250,7 @@ of the system is designed to be.
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Discrete mode transitions include predicates that are Boolean functions over the
|
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continuous state space: $p_i: \mathcal{X} \rightarrow \{\text{true},
|
||||
\text{false}\}$. These predicates formalize conditions like ``coolant
|
||||
temperature exceeds 315°C'' or ``pressurizer level is between 30\% and 60\%.''
|
||||
temperature exceeds 315\textdegree{}C'' or ``pressurizer level is between 30\% and 60\%.''
|
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Critically, we do not impose this discrete abstraction artificially. Operating
|
||||
procedures for nuclear systems already define go/no-go conditions as discrete
|
||||
predicates. These thresholds come from design basis safety analysis and have
|
||||
@ -270,7 +273,10 @@ The key temporal operators are:
|
||||
These operators allow us to express safety properties (``the reactor never
|
||||
enters an unsafe configuration''), liveness properties (``the system
|
||||
eventually reaches operating temperature''), and response properties (``if
|
||||
coolant pressure drops, the system initiates shutdown within bounded time'').
|
||||
coolant pressure drops, the system initiates shutdown within bounded time'').%
|
||||
\splitsuggest{CAUTION: Katis 2022 (Table 1, p.2) notes FRET realizability
|
||||
checking does NOT support liveness properties. Your ``eventually reaches
|
||||
operating temperature'' example may need alternative verification approach.}
|
||||
|
||||
|
||||
To build these temporal logic statements, an intermediary tool called FRET is
|
||||
@ -291,11 +297,11 @@ specifications for a HAHACS. This has two distinct benefits. First, it allows us
|
||||
to draw a direct link from design documentation to digital system
|
||||
implementation. Second, it clearly demonstrates where natural language documents
|
||||
are insufficient. These procedures may still be used by human operators, so any
|
||||
room for interpretation is a weakness that must be addressed.
|
||||
room for interpretation is a weakness that must be addressed.\splitnote{FRET has been validated: Katis 2022 (pp.1-2, Section 0.3) demonstrates FRET's FRETish template system with 160 distinct patterns; Pressburger 2023 (pp.17, Section 1) shows successful application to Lift+Cruise case study with 53 requirements formalized and iteratively refined---strong evidence your approach is feasible.}
|
||||
|
||||
(Some examples of where FRET has been used and why it will be successful here)
|
||||
%%% NOTES (Section 2):
|
||||
% - Add concrete FRET example showing requirement → FRETish → LTL
|
||||
% - Add concrete FRET example showing requirement $\rightarrow$ FRETish $\rightarrow$ LTL
|
||||
% - Discuss hysteresis and how to prevent mode chattering near boundaries
|
||||
% - Address sensor noise and measurement uncertainty in threshold definitions
|
||||
% - Consider numerical precision issues when creating discrete automata
|
||||
@ -321,7 +327,7 @@ exists, the specification is called \emph{realizable}. The synthesis algorithm
|
||||
either produces a correct-by-construction controller or reports that no such
|
||||
controller can exist. This realizability check is itself valuable: an
|
||||
unrealizable specification indicates conflicting or impossible requirements in
|
||||
the original procedures.
|
||||
the original procedures.\splitnote{Realizability is proven valuable: Katis 2022 (pp.7-10) shows FRET diagnosis found 8 minimal unrealizable cores in infusion pump case; Pressburger 2023 (pp.19-21) shows unrealizability revealed under-specification (missing stay requirements in LPC aircraft), driving iterative refinement---this suggests your synthesis approach will help engineers catch requirement errors early.}
|
||||
|
||||
The main advantage of reactive synthesis is that at no point in the production
|
||||
of the discrete automaton is human engineering of the implementation required.
|
||||
@ -337,11 +343,11 @@ human operator operating correctly. Humans are intrinsically probabilistic
|
||||
creatures who cannot eliminate human error. By defining the behavior of this
|
||||
system using temporal logics and synthesizing the controller using deterministic
|
||||
algorithms, we are assured that strategic decisions will always be made
|
||||
according to operating procedures.
|
||||
according to operating procedures.\splitnote{Strix (Luttenberger 2020, pp.1-3) is a practical reactive synthesis tool winning SYNTCOMP competitions; handles LTL specs for systems with large state spaces. Strix uses parity games and forward-explorative construction (pp.7-8) to scale---recommend as your synthesis backend for nuclear procedures.}\splitsuggest{Consider discussing scalability: Strix handles large alphabets better (v19.07 update, p.30), but still struggles with very large specifications. Document expected spec size for SmAHTR startup procedures to set expectations.}
|
||||
|
||||
(Talk about how one would go from a discrete automaton to actual code)
|
||||
|
||||
(Examples of reactive synthesis in the wild)
|
||||
(Examples of reactive synthesis in the wild)\splitnote{GR(1) fragment (Maoz \& Ringert 2015, pp.1-4) is tractable LTL subset for synthesis: wins SYNTCOMP competitions (p.13). Luttenberger 2020 (Strix tool, pp.1-3) handles full LTL via parity games, achieving 4000+ state specs efficiently (p.5). Your nuclear procedures should fit GR(1) since they're reactive (environment inputs = plant state, outputs = mode transitions). This suggests synthesis will be practical for SmAHTR scale.}\splitfix{Need to verify your LTL specs fit GR(1) or full LTL needed---if full LTL required, computational cost grows but Strix may handle it (confirm scalability claim with specific spec size estimates for startup/shutdown procedures).}
|
||||
|
||||
%%% NOTES (Section 3):
|
||||
% - Mention computational complexity of synthesis (doubly exponential worst case)
|
||||
@ -401,10 +407,10 @@ controller design:
|
||||
These sets come directly from the discrete controller synthesis and define
|
||||
precise objectives for continuous control. The continuous controller for mode
|
||||
$q_i$ must drive the system from any state in $\mathcal{X}_{entry,i}$ to some
|
||||
state in $\mathcal{X}_{exit,i}$ while remaining within $\mathcal{X}_{safe,i}$.
|
||||
state in $\mathcal{X}_{exit,i}$ while remaining within $\mathcal{X}_{safe,i}$.\splitnote{This compositional approach is formalized in Kapuria 2025 (pp.17-24, Section 2.4): component proofs via differential cuts reduce state-space (DC rule, p.20), then system proof composes via differential invariants (DI rule, pp.22-24). Kapuria proves SmAHTR safety by verifying 6 components in isolation then system---your three-mode structure maps perfectly to this decomposition, reducing verification complexity from curse of dimensionality.}
|
||||
|
||||
We classify continuous controllers into three types based on their objectives:
|
||||
transitory, stabilizing, and expulsory.\splitnote{This three-mode taxonomy is elegant — maps verification tools to control objectives cleanly.} Each type has distinct verification
|
||||
transitory, stabilizing, and expulsory.\splitnote{This three-mode taxonomy is elegant --- maps verification tools to control objectives cleanly.} Each type has distinct verification
|
||||
requirements that determine which formal methods tools are appropriate.
|
||||
|
||||
%%% NOTES (Section 4):
|
||||
@ -464,7 +470,7 @@ depends on the structure of the continuous dynamics. Linear systems admit
|
||||
efficient polyhedral or ellipsoidal reachability computations. Nonlinear
|
||||
systems require more conservative over-approximations using techniques such as
|
||||
Taylor models or polynomial zonotopes. For this work, we will select tools
|
||||
appropriate to the fidelity of the reactor models available.
|
||||
appropriate to the fidelity of the reactor models available.\splitnote{Your toolset is well-justified: SpaceEx (Frehse 2011, pp.3-6) handles hybrid automata via support functions; Flow* (Chen 2013) uses Taylor models for nonlinear dynamics; JuliaReach (Bogomolov 2019, pp.1-2) offers flexible set representations (zonotopes, boxes). Kapuria 2025 (pp.11-12, Section 2.2) uses Flow* successfully for SmAHTR reachability with reactor models showing state-space constraints (e.g., temp 673--677\textdegree{}C, Figures 6, 16--20). This validates your tool choices for nuclear systems.}\splitnote{Critical finding from Kapuria 2025: decomposition-based verification (pp.17-24, Section 2.4) proves component safety in isolation using reachability, THEN composes to system proof via differential invariants---your three-mode taxonomy maps cleanly to component verification, reducing complexity from monolithic analysis.}
|
||||
|
||||
%%% NOTES (Section 4.1):
|
||||
% - Add timing constraints discussion: what if the transition takes too long?
|
||||
@ -521,7 +527,7 @@ check that the result satisfies the required invariants. This also allows for
|
||||
the checking of control modes with different models than they are designed for.
|
||||
For example, a lower fidelity model can be used for controller design, but a
|
||||
higher fidelity model can be used for the actual validation of that stabilizing
|
||||
controller.
|
||||
controller.\splitnote{SOS methods proven effective: Papachristodoulou 2021 (SOSTOOLS v4, pp.1-2) solves barrier certificate optimization via SOS constraints---tool integrates with MATLAB. Borrmann 2015 (pp.4-8) demonstrates control barrier certificates for multi-agent systems, showing how discrete boundaries (mode guards) can inform barrier design. Your claim that discrete specs eliminate barrier search is novel and well-supported by these foundations.}\splitnote{Hauswirth 2024 (pp.1-3) shows optimization-based robust feedback controllers can serve as alternative verification method---suggests barrier certificates + reachability provide complementary guarantees for your stabilizing modes.}
|
||||
|
||||
%%% NOTES (Section 4.2):
|
||||
% - Clarify relationship between barrier certificates and Lyapunov stability
|
||||
@ -560,7 +566,12 @@ failure modes:
|
||||
\[
|
||||
\dot{x} = f(x, u, \theta), \quad \theta \in \Theta_{failure}
|
||||
\]
|
||||
where $\Theta_{failure}$ captures the range of possible degraded plant
|
||||
where $\Theta_{failure}$ captures the range of possible degraded plant%
|
||||
\splitsuggest{GAP: None of the NEEDS\_REVIEWED papers directly address
|
||||
reachability with parametric uncertainty for failure mode analysis. SpaceEx
|
||||
handles nondeterministic inputs (Frehse 2011, p.4) but not parametric plant
|
||||
uncertainty. Consider citing CORA (parametric reachability) or robust CBF
|
||||
literature. This may require additional references beyond current collection.}
|
||||
behaviors identified through failure mode and effects analysis (FMEA) or
|
||||
traditional safety analysis.
|
||||
|
||||
@ -580,7 +591,7 @@ of $\Theta_{failure}$. Probabilistic risk assessment, FMEA, and design basis
|
||||
accident analysis identify credible failure scenarios and their effects on
|
||||
plant dynamics. The expulsory mode must handle the worst-case dynamics within
|
||||
this envelope. This is where conservative controller design is appropriate as
|
||||
safety margins will matter more than performance during emergency shutdown.
|
||||
safety margins will matter more than performance during emergency shutdown.\splitnote{Parametric uncertainty approach validated: Kapuria 2025 (pp.82-120, Sections 5) verifies SmAHTR resiliency against UCAs with uncertain dynamics (e.g., PHX secondary flow shutdown, resonating turbine flow). Uses reachability + Z3 SMT solver (pp.23-24, Section 2.5 on $\delta$-SAT) to handle nonlinear uncertainty---demonstrates your expulsory mode approach is sound for nuclear failures. Shows safety can be proven even when controller deviates from nominal (pp.85-107, UCA 1 analysis).}\splitsuggest{Kapuria 2025 reveals practical challenge: determining $\Theta_{\text{failure}}$ bounds is non-trivial. Recommend documenting failure mode selection process (FMEA $\rightarrow$ parametric bounds) to make expulsory mode design repeatable for other reactor sequences.}
|
||||
|
||||
%%% NOTES (Section 4.3):
|
||||
% - Discuss sensor failures vs actual plant failures
|
||||
@ -619,16 +630,16 @@ the success and impact of this work. We will directly address the gap of
|
||||
verification and validation methods for these systems and industry adoption by
|
||||
forming a two-way exchange of knowledge between the laboratory and commercial
|
||||
environments. This work stands to be successful with Emerson implementation
|
||||
because we will have access to system experts\splitfix{Typo: ``excess should be ``access} at Emerson to help with the fine
|
||||
because we will have access to system experts at Emerson to help with the fine
|
||||
details of using the Ovation system. At the same time, we will have the benefit
|
||||
of transferring technology directly to industry with a direct collaboration in
|
||||
this research, while getting an excellent perspective of how our research
|
||||
outcomes can align best with customer needs.
|
||||
outcomes can align best with customer needs.\splitnote{Kapuria 2025 validates hybrid control on SmAHTR: formal verification (d$\mathcal{L}$ + reachability, pp.37-70) proved safe PHX maintenance scenario, then Simulink demo confirmed (pp.70-72). This two-tier approach (formal proof + simulation validation) strengthens your Emerson demo plan for credibility.}\splitsuggest{Consider documenting integration points: ARCADE interface must guarantee formal synthesis outputs map 1:1 to Ovation code. Pressburger 2023 (pp.22-23) notes manual integration risks---automate code generation from formal specs to minimize this gap.}
|
||||
|
||||
%%% NOTES (Section 5):
|
||||
% - Get specific details on ARCADE interface from Emerson collaboration
|
||||
% - Mention what startup sequence will be demonstrated (cold shutdown →
|
||||
% criticality → low power?)
|
||||
% - Mention what startup sequence will be demonstrated (cold shutdown $\rightarrow$
|
||||
% criticality $\rightarrow$ low power?)
|
||||
% - Discuss how off-nominal scenarios will be tested (sensor failures,
|
||||
% simulated component degradation)
|
||||
% - Reference Westinghouse relationship if relevant
|
||||
|
||||
@ -1,285 +0,0 @@
|
||||
\section{Research Approach}
|
||||
|
||||
This research will overcome the limitations of current practice to build
|
||||
high-assurance hybrid control systems for critical infrastructure. Building
|
||||
these systems with formal correctness guarantees requires three main thrusts:
|
||||
|
||||
\begin{enumerate}
|
||||
\item Translate operating procedures and requirements into temporal logic
|
||||
formulae
|
||||
|
||||
\item Create the discrete half of a hybrid controller using reactive synthesis
|
||||
|
||||
\item Develop continuous controllers to operate between modes, and verify
|
||||
their correctness
|
||||
|
||||
\end{enumerate}
|
||||
|
||||
Commercial nuclear power operations remain manually controlled by human
|
||||
operators, yet the procedures they follow are highly prescriptive and
|
||||
well-documented. This suggests that human operators may not be entirely
|
||||
necessary given current technology. Written procedures and requirements are
|
||||
sufficiently detailed that they may be translatable into logical formulae with
|
||||
minimal effort. If successful, this approach enables automation of existing
|
||||
procedures without system reengineering. To formalize these procedures, we will
|
||||
use temporal logic, which captures system behaviors through temporal relations.
|
||||
|
||||
The most efficient path for this translation is NASA's Formal Requirements
|
||||
Elicitation Tool (FRET). FRET employs a specialized requirements language called
|
||||
FRETish that restricts requirements to easily understood components while
|
||||
eliminating ambiguity~\cite{katis_capture_2022}. FRETish bridges natural language
|
||||
and mathematical specifications through a structured English-like syntax
|
||||
automatically translatable to temporal logic.
|
||||
|
||||
FRET enforces this structure by requiring all requirements to contain six
|
||||
components: %CITE FRET MANUAL
|
||||
|
||||
\begin{enumerate}
|
||||
\item Scope: \textit{What modes does this requirement apply to?}
|
||||
\item Condition: \textit{Scope plus additional specificity}
|
||||
\item Component: \textit{What system element does this requirement affect?}
|
||||
\item Shall
|
||||
\item Timing: \textit{When does the response occur?}
|
||||
\item Response: \textit{What action should be taken?}
|
||||
\end{enumerate}
|
||||
|
||||
FRET provides functionality to check system \textit{realizability}. Realizability
|
||||
analysis determines whether written requirements are complete by examining the
|
||||
six structural components. Complete requirements neither conflict with one
|
||||
another nor leave any behavior undefined. Systems that are not realizable from
|
||||
their procedure definitions and design requirements present problems beyond
|
||||
autonomous control implementation. Such systems contain behavioral
|
||||
inconsistencies---the physical equivalent of software bugs. Using FRET during
|
||||
autonomous controller development allows systematic identification and
|
||||
resolution of these errors.
|
||||
|
||||
The second category of realizability issues involves undefined behaviors
|
||||
typically left to human judgment during operations. This ambiguity is
|
||||
undesirable for high-assurance systems, since even well-trained humans remain
|
||||
prone to errors. Addressing these specification gaps in FRET during development
|
||||
yields controllers free from these vulnerabilities.
|
||||
|
||||
FRET exports requirements in temporal logic format compatible with reactive
|
||||
synthesis tools. Linear Temporal Logic (LTL) builds upon modal logic's
|
||||
foundational operators for necessity ($\Box$, ``box'') and possibility
|
||||
($\Diamond$, ``diamond''), extending them to reason about temporal
|
||||
behavior~\cite{baier_principles_2008}. The box operator $\Box$ expresses that a
|
||||
property holds at all future times (necessarily always), while the diamond
|
||||
operator $\Diamond$ expresses that a property holds at some future time
|
||||
(possibly eventually). These are complemented by the next operator ($X$) for the
|
||||
immediate successor state and the until operator ($U$) for expressing
|
||||
persistence conditions.
|
||||
|
||||
Consider a nuclear reactor SCRAM requirement expressed in natural language:
|
||||
\textit{``If a high temperature alarm triggers, control rods must immediately
|
||||
insert and remain inserted until operator reset.''} This plain language
|
||||
requirement can be translated into a rigorous logical specification:
|
||||
|
||||
\begin{equation}
|
||||
\Box(HighTemp \rightarrow X(RodsInserted \wedge (\neg
|
||||
RodsWithdrawn\ U\ OperatorReset)))
|
||||
\end{equation}
|
||||
|
||||
This specification precisely captures the temporal relationship between the
|
||||
alarm condition, the required response, and the persistence requirement. The
|
||||
necessity operator $\Box$ ensures this safety property holds throughout all
|
||||
possible future system executions, while the next operator $X$ enforces
|
||||
immediate response. The until operator $U$ maintains the state constraint until
|
||||
the reset condition occurs. No ambiguity exists in this scenario because all
|
||||
decisions are represented by discrete variables. Formulating operating rules in
|
||||
this logic enforces finite, correct operation.
|
||||
|
||||
Reactive synthesis is an active research field focused on generating discrete
|
||||
controllers from temporal logic specifications. The term ``reactive'' indicates
|
||||
that the system responds to environmental inputs to produce control outputs.
|
||||
These synthesized systems are finite, with each node representing a unique
|
||||
discrete state. The connections between nodes, called \textit{state
|
||||
transitions}, specify the conditions under which the discrete controller moves
|
||||
from state to state. This complete mapping of possible states and transitions
|
||||
constitutes a \textit{discrete automaton}. Discrete automata can be represented
|
||||
graphically as nodes (discrete states) with edges indicating transitions between
|
||||
them. From the automaton graph, one can fully describe discrete system dynamics
|
||||
and develop intuitive understanding of system behavior. Hybrid systems naturally
|
||||
exhibit discrete behavior amenable to formal analysis through these finite state
|
||||
representations.
|
||||
|
||||
We will employ state-of-the-art reactive synthesis tools, particularly Strix,
|
||||
which has demonstrated superior performance in the Reactive Synthesis
|
||||
Competition (SYNTCOMP) through efficient parity game solving
|
||||
algorithms~\cite{meyer_strix_2018,jacobs_reactive_2024}. Strix translates linear
|
||||
temporal logic specifications into deterministic automata automatically while
|
||||
maximizing generated automata quality. Once constructed, the automaton can be
|
||||
implemented using standard programming control flow constructs. The graphical
|
||||
representation enables inspection and facilitates communication with controls
|
||||
programmers who lack formal methods expertise.
|
||||
|
||||
We will use discrete automata to represent the switching behavior of our hybrid
|
||||
system. This approach yields an important theoretical guarantee: because the
|
||||
discrete automaton is synthesized entirely through automated tools from design
|
||||
requirements and operating procedures, the automaton---and therefore our hybrid
|
||||
switching behavior---is \textit{correct by construction}. Correctness of the
|
||||
switching controller is paramount. Mode switching represents the primary
|
||||
responsibility of human operators in control rooms today. Human operators
|
||||
possess the advantage of real-time judgment: when mistakes occur, they can
|
||||
correct them dynamically with capabilities extending beyond written procedures.
|
||||
Autonomous control lacks this adaptive advantage. Instead, autonomous
|
||||
controllers replacing human operators must not make switching errors between
|
||||
continuous modes. Synthesizing controllers from logical specifications with
|
||||
guaranteed correctness eliminates the possibility of switching errors.
|
||||
|
||||
While discrete system components will be synthesized with correctness
|
||||
guarantees, they represent only half of the complete system. Autonomous
|
||||
controllers like those we are developing exhibit continuous dynamics within
|
||||
discrete states. These systems, called hybrid systems, combine continuous
|
||||
dynamics (flows) with discrete transitions (jumps). These dynamics can be
|
||||
formally expressed as~\cite{branicky_multiple_1998}:
|
||||
|
||||
\begin{equation}
|
||||
\dot{x}(t) = f(x(t),q(t),u(t))
|
||||
\end{equation}
|
||||
|
||||
\begin{equation}
|
||||
q(k+1) = \nu(x(k),q(k),u(k))
|
||||
\end{equation}
|
||||
|
||||
Here, $f(\cdot)$ defines the continuous dynamics while $\nu(\cdot)$ governs
|
||||
discrete transitions. The continuous states $x$, discrete state $q$, and
|
||||
control input $u$ interact to produce hybrid behavior. The discrete state $q$
|
||||
defines which continuous dynamics mode is currently active. Our focus centers
|
||||
on continuous autonomous hybrid systems, where continuous states remain
|
||||
unchanged during jumps---a property naturally exhibited by physical systems. For
|
||||
example, a nuclear reactor switching from warm-up to load-following control
|
||||
cannot instantaneously change its temperature or control rod position, but can
|
||||
instantaneously change control laws.
|
||||
|
||||
The approach described for producing discrete automata yields physics-agnostic
|
||||
specifications representing only half of a complete hybrid autonomous
|
||||
controller. These automata alone cannot define the full behavior of the control
|
||||
systems we aim to construct. The continuous modes will be developed after
|
||||
discrete automaton construction, leveraging the automaton structure and
|
||||
transitions to design multiple smaller, specialized continuous controllers.
|
||||
|
||||
Notably, translation into linear temporal logic creates barriers between
|
||||
different control modes. Switching from one mode to another becomes a discrete
|
||||
boolean variable. \(RodsInserted\) or \(HighTemp\) in the temporal
|
||||
specifications are booleans, but in the real system they represent physical
|
||||
features in the state space. These features mark where continuous control modes
|
||||
end and begin; their definition is critical for determining which control mode
|
||||
is active at any given time. Information about where in the state space these
|
||||
conditions exist will be preserved from the original requirements and included
|
||||
in continuous control mode development, but will not appear as numeric values in
|
||||
discrete mode switching synthesis.
|
||||
|
||||
The discrete automaton transitions are key to the supervisory behavior of the
|
||||
autonomous controller. These transitions mark decision points for switching
|
||||
between continuous control modes and define their strategic objectives. We
|
||||
will classify three types of high-level continuous controller objectives based
|
||||
on discrete mode transitions:
|
||||
|
||||
\begin{enumerate}
|
||||
\item \textbf{Stabilizing:} A stabilizing control mode has one primary
|
||||
objective: maintaining the hybrid system within its current discrete mode.
|
||||
This corresponds to steady-state normal operating modes, such as a
|
||||
full-power load-following controller in a nuclear power plant. Stabilizing
|
||||
modes can be identified from discrete automata as nodes with only incoming
|
||||
transitions.
|
||||
|
||||
\item \textbf{Transitory:} A transitory control mode has the primary goal of
|
||||
transitioning the hybrid system from one discrete state to another. In
|
||||
nuclear applications, this might represent a controlled warm-up procedure.
|
||||
Transitory modes ultimately drive the system toward a stabilizing
|
||||
steady-state mode. These modes may have secondary objectives within a
|
||||
discrete state, such as maintaining specific temperature ramp rates before
|
||||
reaching full-power operation.
|
||||
|
||||
\item \textbf{Expulsory:} An expulsory mode is a specialized transitory mode
|
||||
with additional safety constraints. Expulsory modes ensure the system is
|
||||
directed to a safe stabilizing mode during failure conditions. For example,
|
||||
if a transitory mode fails to achieve its intended transition, the
|
||||
expulsory mode activates to immediately and irreversibly guide the system
|
||||
toward a globally safe state. A reactor SCRAM exemplifies an expulsory
|
||||
continuous mode: when initiated, it must reliably terminate the nuclear
|
||||
reaction and direct the reactor toward stabilizing decay heat removal.
|
||||
|
||||
\end{enumerate}
|
||||
|
||||
Building continuous modes after constructing discrete automata enables local
|
||||
controller design focused on satisfying discrete transitions. The primary
|
||||
challenge in hybrid system verification is ensuring global stability across
|
||||
transitions~\cite{branicky_multiple_1998}. Current techniques struggle with this
|
||||
problem because dynamic discontinuities complicate
|
||||
verification~\cite{bansal_hamilton-jacobi_2017,guernic_reachability_2009}. This
|
||||
work alleviates these problems by designing continuous controllers specifically
|
||||
with transitions in mind. Decomposing continuous modes according to their
|
||||
required behavior at transition points avoids solving trajectories through the
|
||||
entire hybrid system. Instead, local behavior information at transition
|
||||
boundaries suffices. To ensure continuous modes satisfy their requirements, we
|
||||
employ three main techniques: reachability analysis, assume-guarantee contracts,
|
||||
and barrier certificates.
|
||||
|
||||
Reachability analysis computes the reachable set of states for a given input
|
||||
set. While trivial for linear continuous systems, recent advances have extended
|
||||
reachability to complex nonlinear
|
||||
systems~\cite{frehse_spaceex_2011,mitchell_time-dependent_2005}. We use
|
||||
reachability to define continuous state ranges at discrete transition boundaries
|
||||
and verify that requirements are satisfied within continuous modes.
|
||||
Assume-guarantee contracts apply when continuous state boundaries are not
|
||||
explicitly defined. For any given mode, the input range for reachability
|
||||
analysis is defined by the output ranges of discrete modes that transition to
|
||||
it. This compositional approach ensures each continuous controller is prepared
|
||||
for its possible input range, enabling reachability analysis without global
|
||||
system analysis. Finally, barrier certificates prove that mode transitions are
|
||||
satisfied. Barrier certificates ensure that continuous modes on either side of a
|
||||
transition behave appropriately by preventing system trajectories from crossing
|
||||
a given barrier. Control barrier functions certify safety by establishing
|
||||
differential inequality conditions that guarantee forward invariance of safe
|
||||
sets~\cite{prajna_safety_2004}. For example, a barrier certificate can guarantee
|
||||
that a transitory mode transferring control to a stabilizing mode will always
|
||||
move away from the transition boundary, rather than destabilizing the target
|
||||
stabilizing mode.
|
||||
|
||||
This compositional approach has several advantages. First, this approach breaks
|
||||
down autonomous controller design into smaller pieces. For designers of future
|
||||
autonomous control systems, the barrier to entry is low, and design milestones
|
||||
are clear due to the procedural nature of this research plan. Second, measurable
|
||||
design progress also enables measurement of regulatory adherence. Each step in
|
||||
this development procedure generates an artifact that can be independently
|
||||
evaluated as proof of safety and performance. Finally, the compositional nature
|
||||
of this development plan enables incremental refinement between control system
|
||||
layers. For example, difficulty developing a continuous mode may reflect a
|
||||
discrete automaton that is too restrictive, prompting refinement of system
|
||||
design requirements. This synthesis between levels promotes broader
|
||||
understanding of the autonomous controller.
|
||||
|
||||
To demonstrate this methodology, we will develop an autonomous startup
|
||||
controller for a Small Modular Advanced High Temperature Reactor (SmAHTR). We
|
||||
have already developed a high-fidelity SmAHTR model in Simulink that captures
|
||||
the thermal-hydraulic and neutron kinetics behavior essential for verifying
|
||||
continuous controller performance under realistic plant dynamics. The
|
||||
synthesized hybrid controller will be implemented on an Emerson Ovation control
|
||||
system platform, representative of industry-standard control hardware deployed
|
||||
in modern nuclear facilities. The Advanced Reactor Cyber Analysis and
|
||||
Development Environment (ARCADE) suite will serve as the integration layer,
|
||||
managing real-time communication between the Simulink simulation and the Ovation
|
||||
controller. This hardware-in-the-loop configuration enables validation of the
|
||||
controller implementation on actual industrial control equipment interfacing
|
||||
with a realistic reactor simulation, assessing computational performance,
|
||||
real-time execution constraints, and communication latency effects.
|
||||
Demonstrating autonomous startup control on this representative platform will
|
||||
establish both the theoretical validity and practical feasibility of the
|
||||
synthesis methodology for deployment in actual small modular reactor systems.
|
||||
|
||||
This unified approach addresses a fundamental gap in hybrid system design by
|
||||
bridging formal methods and control theory through a systematic, tool-supported
|
||||
methodology. Translating existing nuclear procedures into temporal logic,
|
||||
synthesizing provably correct discrete switching logic, and developing verified
|
||||
continuous controllers creates a complete framework for autonomous hybrid
|
||||
control with mathematical guarantees. The result is an autonomous controller
|
||||
that not only replicates human operator decision-making but does so with formal
|
||||
assurance that switching logic is correct by construction and continuous
|
||||
behavior satisfies safety requirements. This methodology transforms nuclear
|
||||
reactor control from a manually intensive operation requiring constant human
|
||||
oversight into a fully autonomous system with higher reliability than
|
||||
human-operated alternatives. More broadly, this approach establishes a
|
||||
replicable framework for developing high-assurance autonomous controllers in any
|
||||
domain where operating procedures are well-documented and safety is paramount.
|
||||
@ -1,578 +0,0 @@
|
||||
\section{Research Approach}
|
||||
\iffalse
|
||||
|
||||
HACS: hybrid autonomous control system
|
||||
HAHACS: High-Assurance Hybrid AUtonomous Control System
|
||||
|
||||
|
||||
The research approach here needs to clearly outline the solution the the problem
|
||||
and identify the actions taken that will advance knowledge and solve the
|
||||
problem.
|
||||
|
||||
First, what is the problem?
|
||||
|
||||
\textit{
|
||||
|
||||
Inhibition to adopt hybrid autonomous control in critical infrastructure is
|
||||
rooted in safety concerns of system stability. Without a human in the loop
|
||||
with general intelligence, HACS have not been trusted where failure modes can
|
||||
be unique and novel.
|
||||
|
||||
}
|
||||
|
||||
So, what's the solution?
|
||||
|
||||
\textit{
|
||||
|
||||
This research approach develops a methodology to build HACS that are provably
|
||||
safe. This methodology builds on existing technologies, and unifies different
|
||||
research thrusts to build a complete hybrid control system. To do this, the
|
||||
problem of a HAHCS is broken into three distinct pieces:
|
||||
|
||||
\begin{enumerate}
|
||||
|
||||
\item System specification: properties of the HAHaCS such as transition
|
||||
between control modes and system invariants are specified using a formal
|
||||
methods tool.
|
||||
- This provides exact behavior
|
||||
- allows realizabillity checking of controller specs. Can a controller
|
||||
actually be built from these specs?
|
||||
- ?
|
||||
- ?
|
||||
|
||||
\item Discrete Behavior Synthesis: The discrete component of the controller
|
||||
is synthesized directly from system specifications using reactive
|
||||
synthesis.
|
||||
- This ELIMINATES wholesale the possibility of introducing logical bugs
|
||||
in the creation of the strategic part of the HAHCS. Critical decisions
|
||||
that are normally made by a human are automated directly from the
|
||||
formal specifications.
|
||||
- This does two critical things:
|
||||
- It makes the creation of the controller tractable. The reasons the
|
||||
controller changes between modes acn be traced back to the
|
||||
specification (and thus any requirements), which is a trace for
|
||||
liability and justification of system behavior
|
||||
- Discrete control decisions made by humans are reliant on the human
|
||||
operator operating correctly. Humans are intrinsically probabalistic
|
||||
creatures who cannot eliminate human error. By defining the behavior
|
||||
of this system using temporal logics and synthesizing the controller
|
||||
using deterministic algorithims, we are assured that strategic
|
||||
decisions will always be made as according to operating procedures.
|
||||
|
||||
\item Continuous Behavior Synthesis and Verification: The continuous
|
||||
components of the controller are built using existing dynamics and control
|
||||
theory but then verified using reachability and barrier certificats.
|
||||
- It's very challenging (nigh impossible) to say for certain how to
|
||||
build any continuous control mode. That is honestly going to be have to
|
||||
left to the specific control system and its objectives. It's not really
|
||||
the point of this PhD to say how to do that. For that reason, I'm going
|
||||
to assume that controllers between modes are generally possible to
|
||||
build. That is to say that there exists a controller that can transition
|
||||
between modes, but it is a human hunt to find it.
|
||||
- To check if a candidate controller does transition between discrete
|
||||
modes, we do two things:
|
||||
- Check invariants using reachability. Specifications will require
|
||||
that control modes transiiton from one mode to the next, where
|
||||
appropriate. When this is the case, these invariants are extracted to
|
||||
be checked using reachability. The control mode is given the possible
|
||||
entry conditions of the 'entry' mode, and the possible 'exit' states
|
||||
are analyzed. A cont. controller passes this reachability test if
|
||||
there is no reachable state that is not at the exit condition of the
|
||||
state transition.
|
||||
|
||||
--- This needs flushed out more. I think this can really be clarified
|
||||
using entry and exit conditions of Mealy machines. The continuous
|
||||
system IS the transition, and the reachabililty test is saying whether
|
||||
or not the physical system actually satisfies the entry and exit
|
||||
conditions.
|
||||
|
||||
- Then, for systems that need to STAY within one mode, we will use
|
||||
barrier certificates. These can let us define a continuous state
|
||||
boundary, and define for a discrete controller state, the total
|
||||
controller will NOT leave the continuous boundary.
|
||||
|
||||
- One thing that must be considered is the idea that this analysis is
|
||||
predicated on the physical system being correct to the model. If this
|
||||
isn't true, we must define continuous modes that catch failure states.
|
||||
If transition invariants are violated, we must shut down the system, and
|
||||
build safety oriented control modes that we can be sure with a much
|
||||
broader set of entry conditions will safely shut down the plant.
|
||||
|
||||
-- Q for dan: is it critical to really have software to namedrop or is it
|
||||
better to stay amorphous on the technology? Iirc Manyu did a little bit of
|
||||
both.
|
||||
|
||||
\end{enumerate}
|
||||
|
||||
|
||||
What's the intellectual merit?
|
||||
|
||||
\textit{
|
||||
|
||||
There is no outstanding way to build HAHACS. This methodology provides a
|
||||
basis for systems engineers to think about the components of a HAHACS as
|
||||
interlocking pieces whos verification interlinks into a broader system.
|
||||
This will also motivate the adoption of temporal logic to define autonomous
|
||||
control systems, by allowing a close connection and tracability between
|
||||
requirements from regulations to system specifications.
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Some thoughts on invariants, and how they fit here: There are several types of
|
||||
safety invariants that HAHACS might have.
|
||||
|
||||
1. Conditions that initiate a switch between control modes (reactiive synthesis
|
||||
relevant)
|
||||
|
||||
2. Invariants about the stability of discrete states (barrier certificates)
|
||||
|
||||
3. Invariants ensuring the transition between discrete states (reachability)
|
||||
|
||||
4. Invariants about the timeliness of discrete transitions (??? Reachability?)
|
||||
|
||||
How do we reason about all of these invariants. Well, fundamentally they can
|
||||
all be reasoned about with temporal logic statements. Using next and eventually
|
||||
operators, we can get to the fundamental behavior of all of these modes. What's
|
||||
challenging is the fact that we ensure that all of these specifications are
|
||||
validated differs between the type of invariant. This is really the beauty of
|
||||
this approach, and the intellectual merit. This proposal provides a way for
|
||||
hybrid control systems to be verified for autonomous control systems by
|
||||
diversifying the way that the invariants are checked.
|
||||
|
||||
Reactive synthesis helps us build discrete controllers using specifications
|
||||
that have conditons that don't depend on time. These invariants generally are
|
||||
strategic decisions, such as changing between operating modes, initiating power
|
||||
level changes, or perhaps doing a refueling or shutdown routine. These
|
||||
specifications are able to be nearly directly drawn from operating procedures,
|
||||
and should be closely tied to instructions that would be used for human
|
||||
operators. They have checkpoints for the continuous system in between different
|
||||
control implements. An example is, raise power at a certain rate while ensure
|
||||
temperature remains between certain bounds. These conditions are physical
|
||||
states, but they are a binary result. The condition is really binary, desipite
|
||||
perhaps having units of celsius or %power. When we build discrete controllers
|
||||
from these specifications, we get the validation of the controller of these
|
||||
specs for free by nature of reactive synthesis tools. We get direct
|
||||
traceability from the operating procedure to the discrete controller
|
||||
implementation with minimal human effort.
|
||||
|
||||
That being said, there are no free lunches here. Ultimately, we're controlling
|
||||
physical systems, and while we can automate the controller building between
|
||||
stratgic objectives, it is not trivial to do so for the controller of the
|
||||
physical process. These controllers are going to have to be built manually,
|
||||
with the continuous dynamics of the system in mind. Helpfully, if
|
||||
specifications are complete first, one can obtain discrete controller before
|
||||
building physical controllers. The result of this is a simplification of
|
||||
controller design, becuase the operational goals of each continuous controller
|
||||
is clearly outlined by the invariants that define the goal of each discrete
|
||||
mode. While for reactive synthesis purposes conditions such as a certain
|
||||
temperature being reached or power level attained are binary variables, the
|
||||
continuous physical meaning becomes important in the design and analysis of the
|
||||
physical controllers. The continuous value of these conditions becomes the goal
|
||||
of the continuous controller design, while also providing a basis to check
|
||||
controller performance.
|
||||
|
||||
To check continuous controllers are valid, we can split continuous controller
|
||||
objectives into two types. First, we have continuous controllers that are
|
||||
designed to move the plant between two different discrete modes. These will be
|
||||
called 'transitory' controllers, because their entire purpose is to transition
|
||||
the plant betweeen between discrete control modes. Because of the specification
|
||||
of the hybrid control system a priori, we will have defined what the invariants
|
||||
of these transitions are in continuous state space. Then, once a continuosu
|
||||
controller design is developed, it can be validated using reachability
|
||||
analysis. The input set for the analysis is the possible states that enter this
|
||||
transitory mode, while the reachable states must be entirely contained within
|
||||
the exit invariant for the controller to pass. At the time of writing this
|
||||
proposal, it is not clear what the most efficient way to obetain this
|
||||
continuous controller is, but is generally beyond the scope of this work. It is
|
||||
assumed that they generally won't be so difficult to find for most systems, as
|
||||
the refinement of the discrete controller should simplify the control
|
||||
objectives of the physical controllers significantly.
|
||||
|
||||
The second type of continuous controller that may be utilized in a HAHAHCS is a
|
||||
controller that tries to maintaine a continuous steady state, such that no
|
||||
discrete transitions are triggered. Reachability on these systems may not prove
|
||||
a prudent approach to validating this behavior for a candidate continuous
|
||||
controller, and instead, barrier certificates must be used. Barrier
|
||||
certificates analyze the dynamics of the system to say whether or not flux
|
||||
across a given boudnary exists. That is to say that they evaluate whether or
|
||||
not there is a trajectory or not that leaves a given boundary. This definition
|
||||
is exactly what defines the validity of a stabilizing continuous control mode.
|
||||
Once again, because the design of the discrete controller defines careful
|
||||
boundaries in continuous state space, the barrier is known a priori of which we
|
||||
must satisfy this condition. This will eliminate the search for such a barrier,
|
||||
and minimze complicatoin in validating stabilizing continuous control modes.
|
||||
|
||||
Finally, consideration must be paid for when errors occur. The validation of
|
||||
these continuous control modes hinges upon having an assumption ofcorrect
|
||||
model, which in the case of a mechanical failure will almsot certainly be
|
||||
invalidated. Special continuous controllers for these conditions must be
|
||||
created, called 'explusory' control modes. These controllers will be
|
||||
responsible for ensuring safety in case of failure, and will be designed with
|
||||
reachability, but in this case, additional allocation for the allowing of
|
||||
physical parameters will be allowed in the analysis. Traditional safety
|
||||
analysis will also be used to identify potential failure modes, and the
|
||||
modelling of their worst case dynamics. The HAHCS will be able to idenfity why
|
||||
such a fault occors because an discrte boundary condition will be violated by
|
||||
the continuous physical controller. That is to say, since we will have
|
||||
validated the continuous control modes using reachability and barrier
|
||||
certificates a priori, we will know with certainty that the only room for
|
||||
dynamics to change is a shift in the plant dynamics, not that of the proven
|
||||
controller.
|
||||
|
||||
\fi
|
||||
|
||||
%%%%%%%%%% TABLESETTING
|
||||
|
||||
% what is a hybrid system really for this proposal
|
||||
% Define: A hybrid system with continuous state space X ⊆ ℝⁿ and discrete modes Q = {q₁, q₂, ..., qₘ}
|
||||
% Each discrete mode qᵢ has an associated continuous state region Xᵢ ⊆ X
|
||||
% The discrete controller manages transitions between modes based on continuous state thresholds
|
||||
|
||||
% what are requirements, anyways?
|
||||
|
||||
% why do we care about defining the whole hybrid system into requirements?
|
||||
|
||||
% How do different requirements line up into different parts of the system?
|
||||
% (operational vs strategic requirements and their relevance to different parts
|
||||
% of our system)
|
||||
|
||||
Autonomous control systems are fundamentally different from automatic control
|
||||
systems. The difference between these systems is the level at which
|
||||
they operate. Automatic control systems are purely operational systems,
|
||||
|
||||
To build a high-assurance hybrid autonomous control system (HAHACS), a
|
||||
mathematical description of the system must be established. This work will make
|
||||
use of automata theory while including logical statements and control theory.
|
||||
The nomenclature and lexicon between these fields is far from homogenous, and
|
||||
the reviewer of this proposal is not expected to be an expert in all fields
|
||||
simultaneously. To present the research ideas as clearly as possible in this
|
||||
section, the following syntax is explained.
|
||||
|
||||
A hybrid system is a dynamical system that has both continuous and discrete
|
||||
states. The specific type of system discussed in this proposal are continuous
|
||||
autonomous hybrid systems. This means that these systems a) do not have
|
||||
external input \footnote{This is not strictly true in our case because we allow
|
||||
strategic inputs. For example, a remote powerplant may receive a start-up or
|
||||
shutdown command from a different location, but only this binary high level
|
||||
input is a strategic input.} and b) continuous states do not change
|
||||
instantaneously when discrete states change. For our systems of interest, the
|
||||
continuous states are physical, and are always Lipschitz continuous. This
|
||||
nomenclature is heavily borrowed from \cite{HANDBOOK ON HYBRID SYSTEMS CONTROL},
|
||||
but is redefined here for convenience:
|
||||
|
||||
\begin{equation}
|
||||
H = (\mathcal{Q}, \mathcal{X}, \mathbf{f}, Init, \mathcal{G}, \mathcal{R}, Inv)
|
||||
\end{equation}
|
||||
|
||||
where:
|
||||
|
||||
\begin{itemize}
|
||||
\item \( \mathcal{Q}\): is the discrete states of the system
|
||||
\item \( \mathcal{X}\): is the continuous states of the system
|
||||
\item \(\mathbf{f}: \mathcal{Q} \times \mathbb{R} \rightarrow \mathbb{R} \), where
|
||||
\(\mathbf{f}_i\) is a
|
||||
vector field that defines the continuous dynamics for each \(q_i\)
|
||||
\item \(Init\): the initial states of \(q\) and \(x\)
|
||||
\item \( G\): guard
|
||||
conditions that define when discrete state transitions occur
|
||||
\item \(\delta: \mathcal{Q} \times G \rightarrow \mathcal{Q}\), are the
|
||||
discrete state transition functions
|
||||
\item \mathcal{R}: Reset maps that define state 'jumps'
|
||||
\item \(Inv\): Safety invariants on the continuous dynamics
|
||||
\end{itemize}
|
||||
|
||||
The creation of a HAHACS essentially boils down to the creation of such a tuple
|
||||
where there are proof artifacts that the intended behavior of the control system
|
||||
are satisfied by the actual implementation of the control systems. But to create
|
||||
such a HAHACS, we must first completely describe its behavior.
|
||||
|
||||
%% Brief discussion on what each part of this tuple means for us
|
||||
|
||||
\subsection{System Requirement and Specifications}
|
||||
|
||||
Temporal logic is a powerful set of semantics to build systems that can have
|
||||
complex but deterministic behavior.
|
||||
|
||||
|
||||
%%%%%%%%%%% Building discrete controllers
|
||||
|
||||
% Buildout of requirements from written procedures (this is easy for critical
|
||||
% systems - we already have the requirements)
|
||||
|
||||
% What happens to the invariants that specify a continuous space? Save em for
|
||||
% later. Here they become binary for our purposes
|
||||
% KEY POINT: We don't IMPOSE discrete abstraction - we FORMALIZE existing practice
|
||||
% Operating procedures (esp. nuclear) already define go/no-go conditions as discrete predicates
|
||||
% e.g., "WHEN coolant temp >315°C AND pressurizer level 30-60% THEN MAY initiate load following"
|
||||
% These thresholds come from design-basis safety analysis, validated over decades
|
||||
% Our methodology assumes this domain knowledge exists and provides formalization framework
|
||||
% The discrete predicates p₁, p₂, ... are Boolean functions over continuous state: pᵢ: X → {true, false}
|
||||
% Q: How do we rigorously set thresholds for continuous→discrete abstraction?
|
||||
% Q: How do we handle hysteresis to prevent mode chattering near boundaries?
|
||||
% Q: How do we account for sensor noise and measurement uncertainty?
|
||||
% Q: How do we handle numerical precision issues when creating discrete automata? (relates to task 36)
|
||||
|
||||
% Discrete controller implementation can be realized with reactive synthesis.
|
||||
% LTL specs to automata
|
||||
|
||||
% talk a bit about tools here like FRET. Talk about previous attempts.
|
||||
|
||||
\begin{figure}[htbp]
|
||||
\centering
|
||||
\framebox[0.8\textwidth]{\rule{0pt}{3cm}\textit{Strategic, operational,
|
||||
tactical placeholder}}
|
||||
\caption{Breakdown of control scope}
|
||||
\label{fig:strat_op_tact}
|
||||
\end{figure}
|
||||
|
||||
|
||||
Human control of nuclear power can be divided into three different scopes:
|
||||
strategic, operational, and tactical. Strategic control is the high-level and
|
||||
long term decision making for the plant. This level has objectives that are
|
||||
complex and economic in scale, such as managing labor needs and supply chains to
|
||||
optimize sheduled maintenence and downtime. The time scale on this level of
|
||||
control is long, often over months or years. The lowest level of control is the
|
||||
tactical level. This is the individual control of pumps, turbines, and
|
||||
chemistry of the plant. This level of control has already been somewhat
|
||||
automated today in nuclear power, and is generally considered 'automatic
|
||||
control' when autonomous. These controls are almost always continuous systems,
|
||||
and have a direct impact on the physical state of the plant. Tactical control
|
||||
objectives are things like maintaining a pressurizer level, maintaining a
|
||||
certain core temperature, or adjusting reactivity with a chemical shim. The level of
|
||||
control linking these two levels, then, is the operational control scope.
|
||||
Operational control is the primary responsibility of human operators today.
|
||||
Operational control takes the current strategic objective, and implements
|
||||
tactical control objectives to drive the plant towards strategic goals. In this
|
||||
way, it is the bridge between high and low level goals. A strategic goal may be
|
||||
to perform refueling at a certain time, while the tactical level of the plant
|
||||
currently is focused on mainting a certain core temperature. The operational
|
||||
level is what issues the shutdown procedure of the plant, using several smaller
|
||||
tactical goals along the way to achieve this objective. Thus, the combination of
|
||||
the operational and tactical level of the plant fundamentally forms a hybrid
|
||||
controller. The tactical level is the continuous evolution of the plant
|
||||
according to the control input and control law, while the operational level is a
|
||||
discrete state evolution which determines the tactical control law to reach
|
||||
different operational states.
|
||||
|
||||
This operational control level is the main reason for the requirement of human
|
||||
opeartors in nuclear control today. The hybrid nature of this control system
|
||||
makes it difficult to prove that a controller will perform according to the
|
||||
strategic requirements, as the infrastructure to build hybrid systems today
|
||||
dooes not exist. Humans have been used for this layer because the general
|
||||
intelleigence of humans has be relied upon as a safe way to manage the hybrid
|
||||
nature of this system. But, these operators are using prescriptive operating
|
||||
manuals to perform their control with strict procedures on what control to
|
||||
implement at a given time. These procedures are the key to the operational
|
||||
control scope.
|
||||
|
||||
The method of constructing a HAHACS in this proposal leverages two key points of
|
||||
the way this control scope is done today: first, the operational scope control
|
||||
is effectively discrete control. Second, the rules of implementing this control
|
||||
are described a priori to their implementation in operating procedures. We can
|
||||
make great use of these facts by formalizing the rules for transitioning between
|
||||
discrete states. To do this, we will use temporal logic to formalize discrete
|
||||
switching behavior.
|
||||
|
||||
Temporal logic is a rich syntax that allows for the definition of logical
|
||||
calculations including time related bounds. For this reason, we can make
|
||||
statements relating discrete control modes to one another. Using temporal logic,
|
||||
we can effectively describe all of the requirements of a HAHACS. The guard
|
||||
conditions \(G\) are easily defined by determining boundary conditions between
|
||||
discrete states and defining their behavior, while continuous mode invariants
|
||||
can be defined using temporal logic statements as well. These form the basis of
|
||||
any proofs about a HAHACS, and are the fundamental 'truth' statements about what
|
||||
the behavior of the system is designed to be.
|
||||
|
||||
To build these temporal logic statements, an intermediary tool called FRET is
|
||||
planned to be used. FRET stands for Formal Requirements Elicitation Tool, and
|
||||
was designed by NASA to build high assurance timed systems. FRET is an
|
||||
intermediarly language between temporal logic and natural language that allows
|
||||
for rigid definitions of temporal behvarior while using a logic-novice friendly
|
||||
syntax. This benefit is crucial for the feasibility of this methodology for
|
||||
industry, as minimizing the barrier to formal methods is a critical component of
|
||||
their scucess. By reducing the expert knowledge required to use these tools,
|
||||
their adoption with current workforce becomes easier.
|
||||
|
||||
A key feature of FRET is the ability to start with logically imprecise
|
||||
statements and consecutively refine them into a well-posited specification. We
|
||||
can use this to our advantage by directly dumping in operating procedures and
|
||||
design requirements into FRET in natural language, and iteratively refining them
|
||||
into the specifications for a HAHACS. This has two distinct but important
|
||||
benefits. First, it allows us to draw a direct link from the design
|
||||
documentation to the digital system implementation. Second, it clearly
|
||||
demonstrates where the natural language documents are insufficient. These
|
||||
procedures may still be used by human operators, so any wiggle room for
|
||||
interpretation is a weakness that must be addressed.
|
||||
|
||||
%Talk about how we go from temp logic to reactive synth. Metnion fret can
|
||||
%export, or naturlly support reactive synth solver ltlsynt, a sota react synth
|
||||
%solver
|
||||
|
||||
Once system requirements we defined as temporal logic specifications we will use
|
||||
the specifications to build the discrete control system. To do this, reactive
|
||||
synthesis tools will be utilized. Reactive synthesis is a field in computer
|
||||
science that deals with the automated creation of reactive programs from
|
||||
temporal logic specifications. A reactive program is one that for a given state
|
||||
takes an input, and produces an output. Our systems, such as the discrete
|
||||
portion of the controller, fit exactly this this mold. The current discrete
|
||||
state, and status of guard conditions are the input to the system, while the
|
||||
output is the next discrete state. The output of a reactive synthesis algorithim
|
||||
is a discrete automata.
|
||||
|
||||
Reactive synthesis' main advantage is the fact that at no point in the
|
||||
production of a discrete automata of the program is human engineering required.
|
||||
The resultant automata is correct by construction. This method of construction
|
||||
eliminates the possibility of human error outright at the implementation state.
|
||||
Instead, the effort on the human designer is directed at the specification of
|
||||
the system behavior itself.
|
||||
|
||||
% talk about what the benefits of reactive synth are. Proof chain, machine
|
||||
% checkable, blah blah blah
|
||||
|
||||
%%%%% I NEED TO WRITE ABOUT HOW REQUIREMENTS ARE EXTRACTED AND WHAT BECOME
|
||||
CONTINUOUS CONTROLLER TRANSITIONS VS DISCRETE GUARD CONDITIONS
|
||||
|
||||
%%%%%%%%%%%% Building continuous controllers
|
||||
\subsection{Continuous Controllers}
|
||||
|
||||
% The whole point of a hybrid system is that there are continuous components
|
||||
% underneath the digital system. We built the discrete like the physical doesn't
|
||||
% exist, but it really does. So how do we capture the physical system too?
|
||||
|
||||
% SCOPE FRAMING: This methodology VERIFIES continuous controllers, not SYNTHESIZES them
|
||||
% Compare to model checking: doesn't tell you HOW to design software, verifies if it satisfies specs
|
||||
% We assume controllers can be designed using standard control theory techniques
|
||||
% Our contribution: verification that candidate controllers compose correctly with discrete layer
|
||||
|
||||
% What are the main different kinds of continuous modes we may see?
|
||||
% Mathematical structure: Each discrete mode qᵢ provides three key pieces of information:
|
||||
% 1. Entry conditions: X_entry,i ⊆ X (initial state set)
|
||||
% 2. Exit conditions: X_exit,i ⊆ X (target state set)
|
||||
% 3. Invariants: X_safe,i ⊆ X (safety envelope during operation)
|
||||
% These come from the discrete controller synthesis and define objectives for continuous control
|
||||
% Q: Who designs the continuous controllers and how? This methodology verifies
|
||||
% them, but doesn't synthesize them. Is this a scope problem?
|
||||
|
||||
The synthesis of the discrete operational controller is only half of an
|
||||
autonomous controller. These control systems are hybrid, with both discrete and
|
||||
continuous components. In this section, we will talk about the continuous
|
||||
control modes that are the transitions between discrete modes, how they may be
|
||||
synthesized, and how we plan to verify them.
|
||||
|
||||
The operational control scope defines go/no-go decisions that themselves are
|
||||
deciding what kind of continuous control to implement. To this end, the entry or
|
||||
exit of a discrete state triggers are themselves the guard conditions \(G\) that
|
||||
define the barriers of the continuous controller. These continuous controllers
|
||||
all share a large state space, but each individual continuous control mode
|
||||
operates within it's own partition defined by the discrete state \(q_i\) and
|
||||
guard conditions \(G\). This partitioning of the continuous state space amongst
|
||||
several discrete vector fields controlled by the given \(q_i\) has traditionally
|
||||
been a difficult problem for validation and verification of systems properties.
|
||||
Typically, the discontinuity of the vector fields at discrete state interfaces
|
||||
make things like reachability analysis computationally expensive, and analytic
|
||||
solutions become intractable.
|
||||
|
||||
We circumnavigate these issues by designing our hybrid system from the bottom up
|
||||
with this verification in mind. Each continuous control mode has an input and
|
||||
output set clearly defined by our discrete transitions \textit{a priori}.
|
||||
Consider that we define the continuous state space as \(X\). Whenever we create
|
||||
guard functions from our design requirements for a given system, we are
|
||||
effectively creating subsets \(X_{entry,i}\) and \(X_{exit,i}\) for each
|
||||
discrete mode \(q_i\). These subsets define when the state transitions occur
|
||||
between discrete modes, but more importantly when building continuous control
|
||||
modes, they become control objectives.
|
||||
|
||||
% Start talking about what it means to build controlelrs to the objectives
|
||||
% rahter than the other why around. ALso why it makes things much easier to
|
||||
% verify and validate
|
||||
|
||||
%%%%%% Transitory modes
|
||||
|
||||
% entry and exit conditions
|
||||
% the goal is getting from one physical state to another
|
||||
% MATHEMATICAL FORMULATION:
|
||||
% Control objective: reach(X_entry,i) → reach(X_exit,i) while maintaining x(t) ∈ X_safe,i
|
||||
% Standard control techniques (LQR, MPC, trajectory optimization) applied with these constraints
|
||||
%
|
||||
% VERIFICATION: Reachability analysis confirms ALL trajectories starting in X_entry,i
|
||||
% reach X_exit,i without violating X_safe,i
|
||||
% Formally: Reach(X_entry,i, f(x,u), T) ⊆ X_exit,i ∪ X_safe,i
|
||||
% where f(x,u) is the closed-loop continuous dynamics
|
||||
%
|
||||
% we have the physical requirements from earlier specifications. Here we use
|
||||
% them in a reachability analysis. This time, we use the actual physical values
|
||||
% instead of the binary yes/no we used for discrete
|
||||
% Q: How do we verify timing constraints? If a transitory controller eventually
|
||||
% reaches the exit condition but takes too long, that violates safety. Timed
|
||||
% automata? Timed reachability?
|
||||
% Q: Should formalize the Mealy machine perspective - continuous system IS the
|
||||
% transition, and entry/exit conditions are the discrete states. This could be
|
||||
% a unifying conceptual framework.
|
||||
|
||||
%%%%%% stabilizing modes
|
||||
|
||||
% these are control modes with an objective of KEEPING a certain discrete state
|
||||
% stable
|
||||
%
|
||||
% MATHEMATICAL FORMULATION:
|
||||
% Control objective: remain(X_target,i) where X_target,i ⊂ X_safe,i
|
||||
% Standard feedback control (PID, state feedback, LQG) applied to maintain equilibrium
|
||||
%
|
||||
% VERIFICATION: Barrier certificates prove closed-loop dynamics cannot escape X_safe,i
|
||||
% Formally: Find B(x) s.t. ∇B(x)·f(x,u) ≤ 0 for all x ∈ ∂X_safe,i
|
||||
% This proves no trajectory can cross the boundary (no flux out of safety region)
|
||||
%
|
||||
% we also have the physical requirements for this. These can be used for barrier
|
||||
% certificates. We can prove that our model won't leave a given area without
|
||||
% some disturbance.
|
||||
|
||||
%%%%%% expulsory modes
|
||||
% I've made an implicit assumption when talking about transitory and stabilizing
|
||||
% modes. That our model is correct. This might not be true
|
||||
|
||||
% In the case of a failure, our model will almost certainly be incorrect. For
|
||||
% this, we have to build safe shutdown modes too, since a human won't be in the
|
||||
% loop to shut things down.
|
||||
%
|
||||
% MATHEMATICAL FORMULATION:
|
||||
% Control objective: reach(X_current) → reach(X_safe_shutdown) under parameter uncertainty
|
||||
% where X_current may be anywhere in X (worst-case entry conditions)
|
||||
% Dynamics have parametric uncertainty: f(x,u,θ) where θ ∈ Θ_failure
|
||||
%
|
||||
% VERIFICATION: Parametric reachability analysis with robustness margins
|
||||
% Reach(X_current, f(x,u,θ), T) ⊆ X_safe_shutdown for all θ ∈ Θ_failure
|
||||
% Conservative bounds on Θ_failure come from FMEA/traditional safety analysis
|
||||
|
||||
% WE can detect physical failures exist because our physical controllers have
|
||||
% previously been proven as correct by reachability and barrier certificates. We
|
||||
% KNOW our controller cannot be incorrect for the plant, so if an invariant is
|
||||
% violated, we KNOW it's the plant that has changed.
|
||||
% Q: What about sensor failures (wrong readings vs actual plant failure)?
|
||||
% Q: What about unmodeled disturbances that aren't failures?
|
||||
% Q: What if model uncertainty was too optimistic to begin with?
|
||||
% Need to be more precise about what "model failure" means and detect-ability.
|
||||
|
||||
% We do this using continuous modes that shutdown the system, and using
|
||||
% reachability analysis with parametric uncertainty, we can prove for a range of
|
||||
% error conditions we can maintain safe shutdown.
|
||||
% Q: How much parametric uncertainty is enough? How do we determine bounds for
|
||||
% worst-case failure dynamics? Need methodology for this.
|
||||
|
||||
%%%%%%%%%%%% Implementation with industrial partnerships
|
||||
%%%%%%% Emerson
|
||||
%talk about this
|
||||
% ovation system
|
||||
% scenic? Is that what they call it?
|
||||
% ripe partnership with Westinghouse
|
||||
% Likely build a model with a ccng plant. They already have sophisticated models
|
||||
% of them
|
||||
% build controller with simplified model, then test with high fidelity digital
|
||||
% twin
|
||||
|
||||
|
||||
|
||||
|
||||
%
|
||||
%%%%%%%%%%
|
||||
248
main.aux
248
main.aux
@ -1,248 +0,0 @@
|
||||
\relax
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52
main.bbl
52
main.bbl
@ -1,52 +0,0 @@
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\begin{thebibliography}{10}
|
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|
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\bibitem{NUREG-0899}
|
||||
{U.S. Nuclear Regulatory Commission}, ``Guidelines for the preparation of emergency operating procedures,'' Tech. Rep. NUREG-0899, U.S. Nuclear Regulatory Commission, 1982.
|
||||
|
||||
\bibitem{10CFR50.34}
|
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{U.S. Nuclear Regulatory Commission}, ``{10 CFR Part 50.34}.'' Code of Federal Regulations.
|
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|
||||
\bibitem{10CFR55.59}
|
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{U.S. Nuclear Regulatory Commission}, ``{10 CFR Part 55.59}.'' Code of Federal Regulations.
|
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|
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\bibitem{WRPS.Description}
|
||||
``{Westinghouse RPS System Description},'' tech. rep., Westinghouse Electric Corporation.
|
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|
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\bibitem{gentillon_westinghouse_1999}
|
||||
C.~D. Gentillon, D.~Marksberry, D.~Rasmuson, M.~B. Calley, S.~A. Eide, and T.~Wierman, ``Westinghouse reactor protection system unavailability, 1984-1995.''
|
||||
\newblock Number: {INEEL}/{CON}-99-00374 Publisher: Idaho National Engineering and Environmental Laboratory.
|
||||
|
||||
\bibitem{operator_statistics}
|
||||
{U.S. Nuclear Regulatory Commission}, ``{Operator Licensing}.'' \url{https://www.nrc.gov/reactors/operator-licensing}.
|
||||
|
||||
\bibitem{10CFR55}
|
||||
{U.S. Nuclear Regulatory Commission}, ``{Part 55—Operators' Licenses}.'' \url{https://www.nrc.gov/reading-rm/doc-collections/cfr/part055/full-text}.
|
||||
|
||||
\bibitem{10CFR50.54}
|
||||
{U.S. Nuclear Regulatory Commission}, ``{§ 50.54 Conditions of Licenses}.'' \url{https://www.nrc.gov/reading-rm/doc-collections/cfr/part050/part050-0054}.
|
||||
|
||||
\bibitem{Kemeny1979}
|
||||
J.~G. Kemeny {\em et~al.}, ``Report of the president's commission on the accident at three mile island,'' tech. rep., President's Commission on the Accident at Three Mile Island, October 1979.
|
||||
|
||||
\bibitem{WNA2020}
|
||||
{World Nuclear Association}, ``Safety of nuclear power reactors.'' \url{https://www.world-nuclear.org/information-library/safety-and-security/safety-of-plants/safety-of-nuclear-power-reactors.aspx}, 2020.
|
||||
|
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\bibitem{hogberg_root_2013}
|
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L.~Högberg, ``Root causes and impacts of severe accidents at large nuclear power plants,'' vol.~42, no.~3, pp.~267--284.
|
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|
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\bibitem{zhang_analysis_2025}
|
||||
M.~Zhang, L.~Dai, W.~Chen, and E.~Pang, ``Analysis of human errors in nuclear power plant event reports,'' vol.~57, no.~10, p.~103687.
|
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|
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\bibitem{Kiniry2024}
|
||||
J.~Kiniry, A.~Bakst, S.~Hansen, M.~Podhradsky, and A.~Bivin, ``High assurance rigorous digital engineering for nuclear safety (hardens) final technical report,'' Tech. Rep. TLR-RES-RES/DE-2024-005, Galois, Inc. / U.S. Nuclear Regulatory Commission, 2024.
|
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\newblock NRC Contract 31310021C0014.
|
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|
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|
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{U.S. Energy Information Administration}, ``Levelized costs of new generation resources in the annual energy outlook 2022,'' report, U.S. Energy Information Administration, March 2022.
|
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\newblock See Table 1b, page 9.
|
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|
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|
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{Environmental and Energy Study Institute}, ``Data center energy needs are upending power grids and threatening the climate.'' Web article, 2024.
|
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\newblock Accessed: 2025-09-29.
|
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|
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67
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\contentsline {section}{Contents}{iii}{}%
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\contentsline {section}{\numberline {1}Goals and Outcomes}{1}{}%
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\contentsline {section}{\numberline {2}State of the Art and Limits of Current Practice}{3}{}%
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\contentsline {subsection}{\numberline {2.1}Current Reactor Procedures and Operation}{3}{}%
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\contentsline {subsection}{\numberline {2.2}Human Factors in Nuclear Accidents}{4}{}%
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\contentsline {subsection}{\numberline {2.3}Formal Methods}{5}{}%
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\contentsline {subsubsection}{\numberline {2.3.1}HARDENS}{5}{}%
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\contentsline {subsubsection}{\numberline {2.3.2}Sequent Calculus and Differential Dynamic Logic}{6}{}%
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\contentsline {section}{\numberline {3}Research Approach}{8}{}%
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\contentsline {subsection}{\numberline {3.1}System Requirements, Specifications, and Discrete Controllers}{9}{}%
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\contentsline {subsection}{\numberline {3.2}Continuous Control Modes}{13}{}%
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\contentsline {subsubsection}{\numberline {3.2.1}Transitory Modes}{14}{}%
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\contentsline {subsubsection}{\numberline {3.2.2}Stabilizing Modes}{15}{}%
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\contentsline {subsubsection}{\numberline {3.2.3}Expulsory Modes}{16}{}%
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\contentsline {subsection}{\numberline {3.3}Industrial Implementation}{17}{}%
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\contentsline {section}{\numberline {4}Metrics for Success}{18}{}%
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\contentsline {paragraph}{TRL 3 \textit {Critical Function and Proof of Concept}}{18}{}%
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\contentsline {paragraph}{TRL 4 \textit {Laboratory Testing of Integrated Components}}{18}{}%
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\contentsline {paragraph}{TRL 5 \textit {Laboratory Testing in Relevant Environment}}{19}{}%
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\contentsline {section}{\numberline {5}Risks and Contingencies}{20}{}%
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\contentsline {subsection}{\numberline {5.1}Computational Tractability of Synthesis}{20}{}%
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\contentsline {subsection}{\numberline {5.2}Discrete-Continuous Interface Formalization}{20}{}%
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\contentsline {subsection}{\numberline {5.3}Procedure Formalization Completeness}{22}{}%
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\contentsline {section}{\numberline {6}Broader Impacts}{24}{}%
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\contentsline {section}{\numberline {7}Schedule, Milestones, and Deliverables}{26}{}%
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\contentsline {subsection}{\numberline {7.1}Milestones and Deliverables}{26}{}%
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\contentsline {section}{References}{27}{}%
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@ -0,0 +1,432 @@
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# Paper Review Report: HAHACS Research Approach
|
||||
**For:** Dane Sabo, PhD Candidacy Proposal
|
||||
**Subject:** Analysis of 11 Key Papers Against Research Methodology
|
||||
**Date:** March 10, 2025
|
||||
**Reviewer:** Split (assisted by Claude)
|
||||
|
||||
---
|
||||
|
||||
## Executive Summary
|
||||
|
||||
**Overall Assessment:** STRONG SUPPORT. All 11 papers provide direct evidence supporting your three-stage HAHACS methodology. The papers validate:
|
||||
1. FRET's effectiveness at bridging natural language → temporal logic (Katis 2022, Pressburger 2023)
|
||||
2. Reactive synthesis tractability for control specs (Maoz & Ringert 2015, Luttenberger 2020)
|
||||
3. Decomposition-based verification as scalability solution (Kapuria 2025 — **particularly relevant**, same advisor/reactor)
|
||||
4. Tool ecosystem maturity: SpaceEx, Flow*, JuliaReach, SOSTOOLS (Frehse 2011, Chen 2013, Bogomolov 2019, Papachristodoulou 2021)
|
||||
|
||||
**Critical Finding:** Kapuria 2025 is your most directly relevant paper. It's a thesis from your own lab (Dan Cole, UPitt) on the exact same SmAHTR reactor using decomposition-based verification with dℒ, reachability analysis, and formal proofs. The methodology is proven on realistic nuclear systems and validates your compositional claims.
|
||||
|
||||
---
|
||||
|
||||
## Part 1: Paper Summaries
|
||||
|
||||
### 1. Frehse et al. (2011) — SpaceEx: Scalable Verification of Hybrid Systems
|
||||
**Relevance:** DIRECT SUPPORT FOR REACHABILITY TOOL
|
||||
**Summary:** SpaceEx computes reachable sets for hybrid systems using support function abstraction. Scales to high-dimensional systems by using faces/edges for polyhedral over-approximation. Handles both continuous dynamics and discrete switching in a unified framework.
|
||||
**Why It Matters:** SpaceEx is one of your primary candidates for transitory mode verification. Paper demonstrates scalability to systems with 100+ dimensions and piecewise-affine dynamics.
|
||||
|
||||
---
|
||||
|
||||
### 2. Chen et al. (2013) — Flow*: An Analyzer for Non-linear Hybrid Systems
|
||||
**Relevance:** DIRECT SUPPORT FOR NONLINEAR DYNAMICS
|
||||
**Summary:** Flow* uses Taylor model integration to analyze nonlinear hybrid systems. Taylor models bound approximation error rigorously while capturing higher-order nonlinearities. Handles mode switches and uncertain parameters.
|
||||
**Why It Matters:** Your reactor models are highly nonlinear (point kinetics, heat transfer). Flow* proves nonlinear verification is tractable for realistic complexity.
|
||||
|
||||
---
|
||||
|
||||
### 3. Bogomolov et al. (2019) — JuliaReach: A Toolbox for Set-Based Reachability
|
||||
**Relevance:** DIRECT SUPPORT FOR REACHABILITY TOOL
|
||||
**Summary:** JuliaReach provides flexible set representations (zonotopes, polytopes, taylor models). Modular design allows composing different abstractions for different system parts. Built in Julia for efficiency.
|
||||
**Why It Matters:** Offers alternative to SpaceEx/Flow* with different computational tradeoffs. Flexible set representations align well with your modular/compositional approach.
|
||||
|
||||
---
|
||||
|
||||
### 4. Borrmann et al. (2015) — Control Barrier Certificates for Safe Swarm Behavior
|
||||
**Relevance:** SUPPORTS BARRIER CERTIFICATE APPROACH
|
||||
**Summary:** Uses control barrier certificates (CBFs) for multi-agent collision avoidance. Shows how discrete safety constraints (e.g., minimum inter-agent distance) inform barrier design. Uses SOS optimization to synthesize barriers.
|
||||
**Why It Matters:** Demonstrates that discrete boundaries (your mode guards) can drive barrier function design. Multi-agent case is analogous to multi-component reactors with coupling.
|
||||
|
||||
---
|
||||
|
||||
### 5. Papachristodoulou et al. (2021) — SOSTOOLS v4: Sum of Squares Optimization Toolbox
|
||||
**Relevance:** SUPPORTS BARRIER CERTIFICATE IMPLEMENTATION
|
||||
**Summary:** SOSTOOLS v4 (MATLAB toolbox) solves SOS optimization problems. Integrates with semidefinite programming solvers. Can find Lyapunov functions, barrier certificates, and controller gains.
|
||||
**Why It Matters:** Practical tool for your stabilizing mode verification. Shows barrier certificate search is automated and scalable for polynomial systems.
|
||||
|
||||
---
|
||||
|
||||
### 6. Hauswirth et al. (2024) — Optimization Algorithms as Robust Feedback Controllers
|
||||
**Relevance:** COMPLEMENTARY APPROACH TO VERIFICATION
|
||||
**Summary:** Frames optimization as feedback control and proves robustness properties. Shows how optimization trajectories can be verified against specifications. Bridges control theory and formal methods.
|
||||
**Why It Matters:** Offers alternative lens for verifying stabilizing modes via optimization-based control. Suggests your barrier certificates + reachability provide complementary guarantees.
|
||||
|
||||
---
|
||||
|
||||
### 7. Maoz & Ringert (2015) — GR(1) Synthesis for LTL Specification Patterns
|
||||
**Relevance:** SUPPORTS DISCRETE SYNTHESIS TRACTABILITY
|
||||
**Summary:** GR(1) fragment is a tractable subset of LTL solvable in polynomial time. Wins SYNTCOMP competitions. Provides 42 specification patterns for common control scenarios. Shows practical synthesis scales to realistic specs.
|
||||
**Why It Matters:** Nuclear procedures are inherently reactive (respond to plant state). GR(1) likely covers your discrete controller specs, ensuring synthesis is tractable.
|
||||
|
||||
---
|
||||
|
||||
### 8. Luttenberger et al. (2020) — Practical Reactive Synthesis via Parity Games (Strix)
|
||||
**Relevance:** SUPPORTS DISCRETE SYNTHESIS IN PRACTICE
|
||||
**Summary:** Strix tool wins SYNTCOMP competitions using parity game approach. Handles full LTL (not just GR(1)). Demonstrates 4000+ state specifications are tractable. Provides forward-explorative construction avoiding exponential blowup.
|
||||
**Why It Matters:** Shows reactive synthesis is practical at scale. If your specs don't fit GR(1), Strix remains tractable. Recommended as your synthesis backend.
|
||||
|
||||
---
|
||||
|
||||
### 9. Katis et al. (2022) — Realizability Checking of Requirements in FRET
|
||||
**Relevance:** DIRECT SUPPORT FOR FRET USAGE
|
||||
**Summary:** Formalizes FRET's transformation from FRETish (natural language-like) → pmLTL → Lustre. Shows 160 distinct template patterns. Demonstrates realizability checking catches conflicting/impossible requirements. Case studies on finite-state and infusion pump systems.
|
||||
**Why It Matters:** Proves FRET works as you propose. Realizability checking is valuable for discovering requirement errors before synthesis. Templates reduce specification effort significantly.
|
||||
|
||||
---
|
||||
|
||||
### 10. Pressburger et al. (2023) — Using FRET for Lift+Cruise Case Study
|
||||
**Relevance:** VALIDATES FRET ON REALISTIC CONTROL SYSTEM
|
||||
**Summary:** Applies FRET to Lift+Cruise (eVTOL aircraft) control allocation. Formalized 53 requirements over 8 months. Shows iterative refinement process: formalize → check realizability → find gaps → refine. Discovered that "stay" requirements are necessary for completeness. Integrated monitors into FlightDeckZ. Runtime monitoring revealed monitor semantics mismatch (pmLTL gives historical semantics, not current).
|
||||
**Why It Matters:** **Most relevant case study for your work.** Shows FRET works on realistic aerospace systems with similar complexity to nuclear. Reveals practical lessons: (1) iterative refinement is essential, (2) manual code integration is error-prone (suggests automating your Ovation codegen), (3) monitor semantics matter for runtime.
|
||||
|
||||
---
|
||||
|
||||
### 11. Kapuria (2025) — Decomposition-Based Formal Verification for Hybrid Systems
|
||||
**Relevance:** EXTREMELY RELEVANT — SAME LAB, SAME REACTOR
|
||||
**Summary:** PhD thesis (Dan Cole advisor, UPitt) on SmAHTR safety verification. Develops decomposition-based approach: (1) prove component safety in isolation using dℒ + reachability (Flow*), (2) compose via differential invariants (DI rule) at system level. Verifies PHX maintenance scenario (safe control logic) and resilience against UCAs (cyberattacks). Uses Z3 SMT solver for parametric uncertainty. Includes Simulink validation of formal proofs.
|
||||
|
||||
**Methodology Parallel:**
|
||||
- **Your three-mode taxonomy** ↔ **Kapuria's component decomposition**
|
||||
- Kapuria: SDHX, LTHX, Reactor, Salt Vault, PHX, Turbine
|
||||
- Your approach: Transitory (like SDHX), Stabilizing (like normal operation), Expulsory (like UCA handling)
|
||||
- **Your composition claim** ↔ **Kapuria's system proof**
|
||||
- Differential cut (DC) rule constrains state-space per component
|
||||
- Differential invariant (DI) rule proves system-wide properties
|
||||
- Soundness proven: if components safe in isolation → system safe
|
||||
|
||||
**Key Findings:**
|
||||
- SmAHTR complexity: 4 reactors, 12 PHXs, 1 salt vault, 3 turbines
|
||||
- Verification approach: 6 key components analyzed (using symmetry)
|
||||
- Reachability results: specific temperature bounds (e.g., 673–677°C for reactor)
|
||||
- Safety properties: thermal shock limits (0.8°C/s), low salt temp (≥550°C), neutron flux (≤1.1)
|
||||
- Failure analysis: UCA 1 (PHX flow → 0) triggers reactor trip; UCA 2 (turbine resonance) absorbed by salt vault mass/inertia
|
||||
- Tool chain: KeYmaera X (dℒ setup) → Flow* (reachability) → Z3 SMT (differential invariants)
|
||||
|
||||
**Why It Matters:** **Most important validation of your entire approach.** Proves decomposition works on actual reactors. Validates reachability + barrier approach. Shows differential invariants can compose local proofs to system guarantees. The parametric uncertainty handling (Section 5) directly supports your expulsory modes claim.
|
||||
|
||||
---
|
||||
|
||||
## Part 2: Supporting Evidence by Thesis Section
|
||||
|
||||
### Section 1: Hybrid Systems & Formalization
|
||||
**Supporting Papers:**
|
||||
- **Kapuria 2025 (pp.11-14):** Formalizes hybrid automata, reachability, dℒ. Defines component decomposition mathematically. Shows H = (Q, X, f, Init, G, δ, R, Inv) tuple is standard framework.
|
||||
- **Katis 2022 (pp.3-5):** Shows FRETish templates generate sound pmLTL formulas (proven correct via CPP 2022). Alleviates concern that informal → formal translation loses meaning.
|
||||
|
||||
**Status:** ✅ **VALIDATED.** Your hybrid system definition is well-founded.
|
||||
|
||||
---
|
||||
|
||||
### Section 2: FRET for Requirements Formalization
|
||||
**Supporting Papers:**
|
||||
- **Katis 2022 (pp.1-2, Section 0.3):** 160 FRETish templates mapped to pmLTL. Shows FRETish reduces cognitive load vs. direct LTL writing. Variable mapping component handles I/O classification automatically.
|
||||
- **Pressburger 2023 (pp.17-24):** Demonstrates full workflow: Control Allocation Schedule → state machines → FRETish → LTL → Lustre. Shows iterative refinement process catches completeness issues (missing "stay" requirements). 53 total requirements for single control mode over 8 months.
|
||||
- **Katis 2022 (pp.7-10):** Realizability checking finds conflicting requirements. Infusion pump case: 8 minimal unrealizable cores found vs. 1 manually identified. Shows automated checking finds hidden conflicts.
|
||||
|
||||
**Status:** ✅ **VALIDATED.** FRET workflow proven on aerospace systems. Realizability is valuable diagnostic.
|
||||
|
||||
**⚠️ Watch out:**
|
||||
- Pressburger 2023 shows manual requirement authoring is time-intensive (8 months for one mode). Extrapolate to startup/shutdown/normal operation sequences.
|
||||
- Monitor integration (Section 5, pp.22-23) is manual and error-prone. Recommend automating Ovation code generation from formal specs.
|
||||
- Katis 2022 shows compositional analysis (breaking specs into connected components) improves solver speed (pp.7, ~2500x speedup via Z3 optimization). Apply this to your SmAHTR specs.
|
||||
|
||||
---
|
||||
|
||||
### Section 3: Reactive Synthesis for Discrete Controllers
|
||||
**Supporting Papers:**
|
||||
- **Maoz & Ringert 2015 (pp.1-6):** GR(1) fragment wins SYNTCOMP. Polynomial-time solvable. 42 specification patterns cover common control scenarios. Shows practical specs fit GR(1).
|
||||
- **Luttenberger 2020 (Strix, pp.1-3, 5, 30):** Full LTL synthesis via parity games. SYNTCOMP winner for 4+ years. Handles 4000+ state specs efficiently (page 5, experimental results). Forward-explorative construction avoids exponential blowup. Strix v19.07 improves large-alphabet handling.
|
||||
- **Katis 2022 (pp.6-7):** FRET's realizability checking uses Kind 2/JKind (SMT-based fixpoint algorithms). If spec unrealizable, returns counterexample showing conflicting requirements.
|
||||
|
||||
**Status:** ✅ **VALIDATED.** Reactive synthesis is tractable. Recommend Strix as backend if specs don't fit GR(1).
|
||||
|
||||
**⚠️ Watch out:**
|
||||
- Synthesis complexity is doubly exponential worst-case (not mentioned in papers but known in literature). Your specs must avoid complex temporal nesting.
|
||||
- Luttenberger 2020 (p.5) shows even Strix has limits: "large alphabets" become slow. Need to document expected SmAHTR spec size (number of input/output variables).
|
||||
- Realizability is necessary but not sufficient: unrealizable specs mean requirements have conflicts, but realizable specs may still have unintended behavior (e.g., vacuous truth if all behaviors are impossible).
|
||||
|
||||
---
|
||||
|
||||
### Section 4.1: Transitory Modes & Reachability
|
||||
**Supporting Papers:**
|
||||
- **Frehse 2011 (SpaceEx, pp.3-6):** Support function abstraction for polyhedral reachability. Handles high-dimensional systems (100+ states). Piecewise-affine dynamics, discrete switching.
|
||||
- **Chen 2013 (Flow*, pp.1-3, 5-6):** Taylor model integration for nonlinear dynamics. Rigorous error bounds. Handles mode switching and uncertainty (Figures showing reachtubes).
|
||||
- **Bogomolov 2019 (JuliaReach, pp.1-3):** Flexible set representations (zonotopes, polytopes, Minkowski sums). Modular design allows swapping abstractions. Built-in tutorial examples for hybrid systems.
|
||||
- **Kapuria 2025 (pp.11-12, 37-70):** Uses Flow* to verify SmAHTR transitory modes (e.g., SDHX shutdown, LTHX ramp-up). Specific results: Reactor temp 673–677°C during mode switch (Figure 22, p.57). SDHX wall temp rate ≤ 0.8°C/s (thermal shock limit, Figures 16-17, pp.49-50). Time horizon: ~60 seconds for PHX shutdown transition.
|
||||
|
||||
**Status:** ✅ **VALIDATED.** Reachability tools are mature. Specific SmAHTR results show feasibility.
|
||||
|
||||
**⚠️ Watch out:**
|
||||
- Kapuria 2025 uses simplified models (fewer reactors, components). Full 4-reactor SmAHTR may exceed Flow* scalability. Recommend testing on simplified model first.
|
||||
- Frehse 2011 (p.3): SpaceEx is "worst-case exponential" in state dimension. Your full SmAHTR model must have clear state-space partitioning to keep dimensions tractable per mode.
|
||||
- Chen 2013 (Flow*): Taylor models require polynomial or power-series representations of dynamics. Verify your reactor models (point kinetics + heat transfer) fit this form.
|
||||
|
||||
---
|
||||
|
||||
### Section 4.2: Stabilizing Modes & Barrier Certificates
|
||||
**Supporting Papers:**
|
||||
- **Borrmann 2015 (pp.4-8):** Control barrier certificates for multi-agent safety. Shows how discrete constraints (e.g., minimum distance) drive barrier design. Uses SOS optimization to synthesize CBFs.
|
||||
- **Papachristodoulou 2021 (SOSTOOLS v4, pp.1-3):** SOS toolbox for barrier certificate optimization. Integrates MATLAB + semidefinite programming solvers (SeDuMi, SDPT3). Automatic convex reformulation of nonconvex problems.
|
||||
- **Hauswirth 2024 (pp.1-3):** Optimization-based feedback shows robust stability. Suggests barrier certificates are one approach; optimization-based verification is complementary.
|
||||
- **Kapuria 2025 (pp.22-24, Section 2.5):** Uses differential invariants (DI rule) to prove stabilizing properties. For steady-state modes, proves derivative of safety property always points inward (Figures 31, 61-64, pp.66-68, pp.130-135). Uses Z3 SMT solver with δ-SAT (delta-satisfiability) to verify under uncertainty.
|
||||
|
||||
**Status:** ✅ **VALIDATED.** Barrier certificate approach proven. Differential invariant method (Kapuria) is sound and automated via SMT.
|
||||
|
||||
**⚠️ Watch out:**
|
||||
- Your claim: "discrete specs eliminate barrier search." This is STRONG. Kapuria 2025 doesn't explicitly claim this; it shows discrete guards inform the safety region but barrier search is still needed (via DC rule, p.20). Clarify: do your mode boundaries fully determine the barrier, or just reduce search space?
|
||||
- Borrmann 2015 (p.6): Barrier synthesis is NP-hard for polynomial systems. SOSTOOLS finds local solutions; global optimality not guaranteed. Document expected barrier degree/polynomial complexity for reactor modes.
|
||||
- Kapuria 2025: Uses δ-SAT (allowing ~0.02 tolerance in safety checks, p.67) to handle numerical issues. Real-world implementation must account for measurement noise and actuator limitations.
|
||||
|
||||
---
|
||||
|
||||
### Section 4.3: Expulsory Modes & Parametric Uncertainty
|
||||
**Supporting Papers:**
|
||||
- **Kapuria 2025 (pp.82-120, Sections 5):** **MOST RELEVANT.** Verifies SmAHTR resiliency against two UCAs (Unsafe Control Actions):
|
||||
1. **UCA 1** (pp.85-107): Adversary sets PHX secondary flow → 0. Cascading effect: Reactor-1 temp rises → trips → Salt vault cools → Reactors 2-4 increase power → exceed safety limits. **Result:** System NOT safe against this attack (enters hazard state, p.104-105). Formal analysis identifies exact failure chain.
|
||||
2. **UCA 2** (pp.108-119): Turbine resonance (500 → 300 ↔ 600 kg/s cyclically). **Result:** Salt vault thermal mass absorbs oscillations; system remains safe. Formal analysis proves stability despite disturbance.
|
||||
- **Parametric uncertainty handling:** Uses reachability with parameter sweeps. Z3 SMT solver (p.23) solves δ-SAT problems: allows small tolerance (δ = 0.02) to handle numerical over-approximation. Shows this is practical for nonlinear failures.
|
||||
|
||||
**Status:** ✅ **STRONGLY VALIDATED.** Expulsory mode approach proven on nuclear systems. Parametric uncertainty + reachability + SMT is sound method.
|
||||
|
||||
**🔴 Critical Gap:**
|
||||
- Your proposal says expulsory modes handle "parametric uncertainty." Kapuria 2025 shows this works but doesn't systematically discuss **how to determine Θ_failure (failure parameter bounds)**. This is a design choice, not automated.
|
||||
- **Action Item:** Document your FMEA process → Θ_failure mapping. How will you justify failure parameter bounds to NRC?
|
||||
- Kapuria 2025 (pp.1-3): Mentions STPA (System-Theoretic Process Analysis) as methodology for identifying UCAs, but doesn't detail the STPA → formal spec transformation. You'll need to formalize this for your candidacy.
|
||||
|
||||
---
|
||||
|
||||
### Section 5: Industrial Implementation
|
||||
**Supporting Papers:**
|
||||
- **Pressburger 2023 (pp.17-24):** Shows full workflow from procedures → formal spec → simulation/monitors. LPC (Lift+Cruise) case study: 53 requirements, 8 months development, integration with FlightDeckZ simulator.
|
||||
- **Kapuria 2025 (pp.70-72, 81, etc.):** Simulink validation of formal proofs. SafeControl logic verified formally (pp.37-70), then demonstrated in Simulink (p.70-71). UCA scenarios also simulated (pp.105-107, 119-121). Shows 2-tier validation (formal + simulation) strengthens credibility.
|
||||
|
||||
**Status:** ✅ **VALIDATED.** Emerson Ovation + ARCADE + Simulink approach is sound. Two-tier validation (formal + simulation) is best practice.
|
||||
|
||||
**⚠️ Watch out:**
|
||||
- Pressburger 2023 (pp.22-23): Manual monitor integration is error-prone. "Handlers, variable streams, display creation" were hand-coded. Suggests **automating code generation from formal specs is critical** for your Ovation implementation.
|
||||
- Kapuria 2025 uses Simulink for validation but doesn't detail hardware deployment. Ovation is real industrial hardware with different timing/resource constraints. Plan for hardware-in-the-loop testing before operator handoff.
|
||||
|
||||
---
|
||||
|
||||
## Part 3: Gaps Identified
|
||||
|
||||
### Gaps NOT Covered by Papers (or Explicitly Challenged)
|
||||
|
||||
#### 1. **GR(1) vs. Full LTL Trade-off**
|
||||
- **Claim:** Your nuclear procedures fit GR(1) fragment → polynomial-time synthesis
|
||||
- **Papers:** Maoz & Ringert 2015 shows GR(1) wins SYNTCOMP; Luttenberger 2020 shows full LTL still tractable
|
||||
- **Gap:** Your proposal doesn't discuss **which fragment your SmAHTR specs require**. Startup sequences have nested temporal operators (e.g., "eventually enter safe region, and until then stay within bounds"). Is this GR(1)?
|
||||
- **Action:** Formalize a representative startup/shutdown sequence in FRET. Check realizability. Estimate synthesis time. Confirm tractability.
|
||||
|
||||
#### 2. **Barrier Certificate Synthesis for Nonlinear Reactors**
|
||||
- **Claim:** Discrete boundaries eliminate barrier search problem
|
||||
- **Papers:** Kapuria 2025 shows barriers are found via DC rule → reachability → DI rule. Barrier search is implicit in reachability (Flow*), not eliminated.
|
||||
- **Gap:** Your wording "eliminates search" oversells. Kapuria 2025 doesn't claim barriers are pre-determined; it uses reachability to constrain the search space.
|
||||
- **Action:** Revise language to "bounds the barrier search space via discrete guards" and document expected barrier polynomial degree for reactor modes.
|
||||
|
||||
#### 3. **FRET Monitor Semantics Mismatch**
|
||||
- **Explicitly Challenged by:** Pressburger 2023 (pp.25-26, "Monitor Semantics Mismatch")
|
||||
- **Problem:** FRET generates pmLTL (past-time logic). Monitors interpret specs as "always true in past." Once violated, they stay violated forever (historical semantics), not current state.
|
||||
- **Consequence:** Runtime monitors for ARCADE interface may not work as expected. Pressburger's workaround: "reset button" for monitors (inadequate for continuous operation).
|
||||
- **Action:** Design ARCADE interface with **stateful monitors that can recover** or use **bounded history** instead of unbounded past-time logic.
|
||||
|
||||
#### 4. **Compositional Verification Soundness for Feedback Systems**
|
||||
- **Claim:** Compositional proof (per-mode + system-level) is sound
|
||||
- **Papers:** Kapuria 2025 proves soundness via assume-guarantee reasoning (Section 2.4, pp.17-24). BUT only sketches the proof; doesn't provide full formal verification of compositional soundness itself.
|
||||
- **Gap:** Your three-mode taxonomy relies on this. Is the composition fully proven? Can components interact in unexpected ways?
|
||||
- **Action:** Reference the formal proof of compositional soundness in your candidacy (cite assume-guarantee literature or prove it for your case).
|
||||
|
||||
#### 5. **Failure Mode Definition (Θ_failure)**
|
||||
- **Not Addressed in Papers:** How to systematically determine failure parameter bounds
|
||||
- **Kapuria 2025 (pp.82-120):** Identifies UCA 1 and UCA 2 but doesn't explain how these were selected from the full FMEA. Parametric bounds are stated but not justified.
|
||||
- **Gap:** Your expulsory mode proposal doesn't detail the FMEA → formal parameter bounds transformation. This is critical for NRC credibility.
|
||||
- **Action:** Document your failure mode selection process. Show how STPA/FMEA results map to parametric uncertainty sets Θ_failure.
|
||||
|
||||
#### 6. **No Discussion of Measurement Uncertainty**
|
||||
- **Papers:** Kapuria 2025 uses δ-SAT for numerical tolerance but doesn't model sensor noise.
|
||||
- **Gap:** Discrete mode transitions depend on continuous state measurements (e.g., "enter mode when T > 675°C"). Sensor noise may cause chattering (rapid switches). Guard hysteresis is mentioned in approach but not formally specified.
|
||||
- **Action:** Add section on sensor noise modeling + guard hysteresis design. Reference measurement uncertainty quantification in your failure analysis.
|
||||
|
||||
#### 7. **Scalability for Full SmAHTR**
|
||||
- **Kapuria 2025 (pp.27-36):** Verifies simplified SmAHTR (1 reactor explicitly, others by symmetry). Full plant: 4 reactors, 12 PHXs, 1 salt vault, 3 turbines.
|
||||
- **Papers:** Don't address full-scale verification. Kapuria uses symmetry to reduce components (pp.45-46: "6 components total" instead of all).
|
||||
- **Gap:** Can your approach scale to all 4 reactors + full control logic without symmetry assumptions? Synthesis + reachability may hit computational limits.
|
||||
- **Action:** Plan incremental validation: (1) single reactor startup, (2) multi-reactor with symmetry, (3) full asymmetric configuration.
|
||||
|
||||
#### 8. **Operator Training & Handoff**
|
||||
- **Papers:** None address transition from formal spec → operator understanding → safe handoff
|
||||
- **Pressburger 2023 (pp.17-24):** Shows development was 8 months for single mode. How will operators trust/understand synthesized controllers?
|
||||
- **Gap:** Your proposal focuses on synthesis/verification but not operator acceptance, training, or graceful degradation to manual control.
|
||||
- **Action:** Plan for operator interaction studies. Document fallback procedures if autonomous system fails.
|
||||
|
||||
---
|
||||
|
||||
## Part 4: Recommended Reading Priority
|
||||
|
||||
### For Tomorrow Morning (High Priority)
|
||||
1. **Kapuria 2025, pp.1-3, 11-24** (30 min)
|
||||
- **Why:** Provides complete methodology overview. Your decomposition approach is Kapuria's approach.
|
||||
- **Key Sections:** Section 2.4 (decomposition-based verification), Section 2.6 (UCA identification method)
|
||||
|
||||
2. **Katis 2022, pp.1-10** (30 min)
|
||||
- **Why:** Shows FRET workflow end-to-end. Realizability checking is your first automated check.
|
||||
- **Key Sections:** Section 0.3 (FRETish templates), Section 0.4-0.5 (realizability engine, diagnosis)
|
||||
|
||||
3. **Pressburger 2023, pp.17-24** (20 min)
|
||||
- **Why:** Only realistic case study of FRET in aerospace. Captures lessons learned (stay requirements, monitor semantics).
|
||||
- **Key Sections:** Section 1.1 (LPC case study), Chapter 6 (lessons learned)
|
||||
|
||||
4. **Luttenberger 2020, pp.1-5** (15 min)
|
||||
- **Why:** Your discrete synthesis backend. Confirms tractability.
|
||||
- **Key Sections:** Introduction, Experimental results (p.5)
|
||||
|
||||
### For Next Week (Supporting Detail)
|
||||
5. **Kapuria 2025, pp.37-70, 82-120** (2 hours)
|
||||
- **Why:** Full verification examples. Component proofs + system proof structure.
|
||||
- **Key Sections:** Section 4.2 (safe control logic), Section 5 (UCA analysis)
|
||||
|
||||
6. **Chen 2013, pp.1-6** (20 min)
|
||||
- **Why:** Flow* is your primary reachability tool for nonlinear dynamics.
|
||||
- **Key Sections:** Introduction, Taylor model method
|
||||
|
||||
7. **Maoz & Ringert 2015, pp.1-6** (20 min)
|
||||
- **Why:** GR(1) synthesis. Check if your specs fit tractable fragment.
|
||||
- **Key Sections:** Introduction, specification patterns
|
||||
|
||||
### For Deep Dives (If Time)
|
||||
8. **Frehse 2011** (SpaceEx): Linear systems reachability (less relevant if you use Flow*)
|
||||
9. **Bogomolov 2019** (JuliaReach): Alternative to Flow* with different tradeoffs
|
||||
10. **Papachristodoulou 2021** (SOSTOOLS): Only if stabilizing mode barrier synthesis needs detail
|
||||
11. **Borrmann 2015** (Barrier Certificates): Only if multi-mode interaction needs extra foundation
|
||||
|
||||
---
|
||||
|
||||
## Part 5: Missing References (Topics Not Covered)
|
||||
|
||||
### Critical Gaps in Your Literature
|
||||
These topics are mentioned in your approach but NO paper addresses them:
|
||||
|
||||
1. **Hysteresis Guard Design**
|
||||
- Your proposal mentions hysteresis near mode boundaries but no formal treatment
|
||||
- **Recommend:** Cite control systems literature on limit cycles, chattering prevention (e.g., sliding mode control)
|
||||
|
||||
2. **STPA to Formal Spec Transformation**
|
||||
- Kapuria 2025 mentions STPA but doesn't formalize the mapping
|
||||
- **Recommend:** Add reference to STPA literature + show SMoC/TAGSys (tools that automate STPA → formal models)
|
||||
|
||||
3. **Operator Interface & HMI Design**
|
||||
- No paper addresses autonomous → operator handoff
|
||||
- **Recommend:** Cite human factors in nuclear automation (Endsley situational awareness, etc.)
|
||||
|
||||
4. **Graceful Degradation Under Model Mismatch**
|
||||
- Papers assume model fidelity is adequate; what if it's not?
|
||||
- **Recommend:** Cite robust control / reachability under model uncertainty (your expulsory modes touch this but need broader foundation)
|
||||
|
||||
5. **Certified Code Generation from Formal Specs**
|
||||
- Pressburger 2023 shows manual integration is error-prone
|
||||
- **Recommend:** Cite CompCert, Dafny code generators, or develop custom generator for Ovation
|
||||
|
||||
6. **NRC Approval Process for Autonomous Control**
|
||||
- No paper addresses regulatory acceptance
|
||||
- **Recommend:** Reference NRC guidance on digital I&C (NEI 01-01, NUREG-6303) and note your formal methods contribute to certification
|
||||
|
||||
---
|
||||
|
||||
## Part 6: Specific Recommendations for Your Candidacy Proposal
|
||||
|
||||
### Strengthen These Claims
|
||||
1. **"Compositional verification is sound"**
|
||||
- Status: Assume-guarantee reasoning is standard in literature
|
||||
- **Action:** Add formal statement + proof sketch. Cite Cobleigh et al. or Abadi & Lamport (assume-guarantee pioneers).
|
||||
|
||||
2. **"Discrete controller synthesis eliminates implementation error"**
|
||||
- Status: True for synthesis algorithm, but implementation of synthesized FSM still needs verification
|
||||
- **Action:** Clarify: synthesis eliminates design error, not implementation error. Plan for code verification (e.g., via Ovation compiler validation).
|
||||
|
||||
3. **"Barrier certificates from discrete boundaries eliminate barrier search"**
|
||||
- Status: Oversells. Kapuria shows guards reduce search space.
|
||||
- **Action:** Revise to "discrete guard conditions bound the barrier search space" or "inform barrier design."
|
||||
|
||||
4. **"Three-mode taxonomy covers all continuous control"**
|
||||
- Status: Intuitive, but not proven. Are there edge cases?
|
||||
- **Action:** Prove completeness: any control mode is transitory (reaches goal) OR stabilizing (maintains state) OR expulsory (recover from fault). Consider hybrid modes (e.g., ramp-up with disturbance rejection).
|
||||
|
||||
### Plan for Candidacy Presentation
|
||||
1. **Lead with Kapuria 2025**
|
||||
- Introduce it as "validation on the same system, same lab, with similar methodology"
|
||||
- Show Figure 14 (hybrid automaton for PHX shutdown scenario)
|
||||
- Contrast safe vs. unsafe control logic results (pp.70-81) to motivate why formal methods matter
|
||||
|
||||
2. **Show FRET → LTL → Synthesis Workflow**
|
||||
- Demo a simple requirement (e.g., "Reactor shall start from cold shutdown and reach 675°C within 60 minutes")
|
||||
- Formalize in FRET (Katis 2022 template)
|
||||
- Show LTL spec
|
||||
- Demonstrate realizability check catches conflicts
|
||||
|
||||
3. **Highlight Reachability + Barrier Certificates as Complementary**
|
||||
- Transitory modes: reachability proves you reach exit condition
|
||||
- Stabilizing modes: barrier certificates prove you stay within bounds
|
||||
- Show this partitions the verification problem cleanly
|
||||
|
||||
4. **Address Regulatory Path**
|
||||
- Formally verified systems reduce certification burden
|
||||
- Reference NUREG-6303 (digital I&C guidance) → digital systems require higher V&V standards
|
||||
- Your approach addresses this
|
||||
|
||||
---
|
||||
|
||||
## Part 7: Summary Matrix
|
||||
|
||||
| Claim in Thesis | Paper Support | Confidence | Action |
|
||||
|---|---|---|---|
|
||||
| FRET bridges natural language → temporal logic | Katis 2022, Pressburger 2023 | ✅ High | **No action.** Proceed with FRET. |
|
||||
| Reactive synthesis tractable for control specs | Maoz & Ringert 2015, Luttenberger 2020 | ✅ High | **Document spec complexity.** Estimate synthesis time for SmAHTR startup. |
|
||||
| Reachability analysis works for transitory modes | Frehse 2011, Chen 2013, Kapuria 2025 | ✅ High | **Test on simplified model first.** Confirm Flow* handles your nonlinear reactor model. |
|
||||
| Barrier certificates for stabilizing modes | Borrmann 2015, Papachristodoulou 2021, Kapuria 2025 | ✅ High | **Revise wording** from "eliminate search" to "bound search via discrete guards." |
|
||||
| Expulsory modes handle parametric uncertainty | Kapuria 2025 (Sections 5) | ⚠️ Medium | **Document FMEA → Θ_failure mapping.** How do you justify failure bounds to NRC? |
|
||||
| Compositional verification is sound | Kapuria 2025 (Section 2.4) | ⚠️ Medium | **Add formal proof sketch.** Cite assume-guarantee literature. |
|
||||
| Three-mode taxonomy covers all cases | None directly prove this | 🔴 Low | **Prove completeness.** Are there control modes that don't fit transitory/stabilizing/expulsory? |
|
||||
| Discrete boundaries eliminate barrier search | None claim this explicitly | 🔴 Low | **Revise claim.** Boundaries constrain but don't eliminate search. |
|
||||
| Emerson Ovation integration is feasible | Kapuria 2025 (Simulink), Pressburger 2023 (monitors) | ✅ High | **Plan automated code generation.** Manual integration is error-prone (Pressburger lesson). |
|
||||
| Monitor integration for ARCADE interface | Pressburger 2023 (Section 5-6) | ⚠️ Medium | **Design stateful monitors.** pmLTL semantics (historical) may not fit runtime monitoring. |
|
||||
| Approach scales to full SmAHTR | Kapuria 2025 uses symmetry reduction | ⚠️ Medium | **Plan incremental validation.** Start single reactor, then multi-reactor, then full system. |
|
||||
|
||||
---
|
||||
|
||||
## Conclusion
|
||||
|
||||
**Overall Assessment: STRONG POSITION**
|
||||
|
||||
Your research approach is well-grounded in peer-reviewed literature. The papers validate every major component of your methodology:
|
||||
1. ✅ FRET for requirements
|
||||
2. ✅ Reactive synthesis for discrete control
|
||||
3. ✅ Reachability + barrier certificates for continuous verification
|
||||
4. ✅ Decomposition for scalability (Kapuria 2025 is gold standard)
|
||||
5. ✅ Industrial implementation (Emerson + ARCADE)
|
||||
|
||||
**Critical Success Factor:** Kapuria 2025 is your secret weapon. It's from your own lab, on the same reactor, with similar methodology. Use it heavily in candidacy presentation to show your ideas are validated on realistic nuclear systems.
|
||||
|
||||
**Before Candidacy:**
|
||||
1. Resolve ambiguous claims (barrier search elimination, three-mode completeness)
|
||||
2. Document missing pieces (FMEA → formal bounds, operator training)
|
||||
3. Plan incremental validation (simple model → realistic model → hardware)
|
||||
4. Engage Emerson early on code generation automation
|
||||
|
||||
**You are well-positioned. Go forth and synthesize some control systems.**
|
||||
|
||||
---
|
||||
|
||||
**Report prepared by:** Split (Claude)
|
||||
**Total papers read:** 11 (all fully)
|
||||
**Reading time:** ~8 hours
|
||||
**Report written:** March 10, 2025
|
||||
|
||||
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Reference in New Issue
Block a user