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Three-pass editorial review: TACTICAL (sentence-level): - Applied Gopen's Sense of Structure principles - Improved topic-stress positioning (key info at sentence end) - Strengthened verb choices and tightened passive constructions - Enhanced topic strings for better flow between related sentences - Consolidated choppy passages into smoother prose OPERATIONAL (paragraph/section): - Improved transitions between subsections - Enhanced coherence within sections - Tightened paragraph-level flow - Reorganized content for clearer logical progression - Strengthened section endings and beginnings STRATEGIC (document-level): - Made Heilmeier questions explicit at section openings - Improved alignment between section content and assigned questions - Enhanced summary paragraphs answering Heilmeier questions - Clarified how sections link to overall proposal structure - Strengthened transitions between major sections All changes maintain technical accuracy while improving clarity and impact.
54 lines
4.0 KiB
TeX
54 lines
4.0 KiB
TeX
% GOAL PARAGRAPH
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This research develops autonomous control systems with mathematical guarantees of safe and correct behavior.
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% INTRODUCTORY PARAGRAPH Hook
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Today's nuclear reactors depend on human operators with extensive training. These operators follow detailed written procedures and switch between control objectives based on plant conditions.
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% Gap
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Small modular reactors face a fundamental economic challenge: their per-megawatt staffing costs significantly exceed those of conventional plants, threatening their economic viability. Autonomous control systems could manage complex operational sequences without constant supervision—but only with assurance equal to or exceeding human-operated systems.
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% APPROACH PARAGRAPH Solution
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This research produces hybrid control systems correct by construction, combining formal methods from computer science with control theory.
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% Rationale
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Human operators already work this way: discrete logic switches between continuous control modes. Formal methods alone fail because they generate provably correct switching logic but cannot handle the continuous dynamics governing transitions. Control theory alone also fails because it verifies continuous behavior but cannot prove discrete switching correctness. Achieving end-to-end correctness requires both approaches working together.
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% Hypothesis and Technical Approach
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Three stages bridge this gap. First, NASA's Formal Requirements Elicitation Tool (FRET) translates written operating procedures into temporal logic specifications, structuring requirements by scope, condition, component, timing, and response. Realizability checking exposes conflicts and ambiguities before implementation begins. Second, reactive synthesis generates deterministic automata provably correct by construction. Third, reachability analysis verifies that continuous controllers satisfy the requirements each discrete mode imposes. Standard control theory techniques design these continuous controllers.
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Control objectives classify continuous modes into three types: transitory modes drive the plant between conditions, stabilizing modes maintain operation within regions, and expulsory modes ensure safety under failures. Barrier certificates and assume-guarantee contracts prove safe mode transitions, enabling local verification without global trajectory analysis. An Emerson Ovation control system will demonstrate the methodology.
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% Pay-off
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This approach manages complex nuclear power operations autonomously while maintaining safety guarantees, directly addressing the economic constraints threatening small modular reactor viability.
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% OUTCOMES PARAGRAPHS
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This research, if successful, produces three concrete outcomes:
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\begin{enumerate}
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% OUTCOME 1 Title
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\item \textit{Synthesize written procedures into verified control logic.}
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% Strategy
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A methodology converts written operating procedures into formal specifications.
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Reactive synthesis tools then generate discrete control logic from these specifications.
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% Outcome
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Control engineers generate mode-switching controllers directly from regulatory
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procedures. Minimal formal methods expertise required. This reduces barriers to
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high-assurance control systems.
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% OUTCOME 2 Title
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\item \textit{Verify continuous control behavior across mode transitions.}
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% Strategy
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Reachability analysis verifies that continuous control modes satisfy discrete
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transition requirements.
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% Outcome
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Engineers design continuous controllers using standard practices while
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maintaining formal correctness guarantees. Mode transitions occur safely and at
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the correct times—provably.
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% OUTCOME 3 Title
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\item \textit{Demonstrate autonomous reactor startup control with safety
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guarantees.}
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% Strategy
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This methodology demonstrates on a small modular reactor simulation using industry-standard control hardware.
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% Outcome
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Control engineers implement high-assurance autonomous controls on
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industrial platforms they already use, enabling autonomy without retraining
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costs or new equipment development.
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\end{enumerate}
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