---
id: LIT-20251023125758
title: NUREG899
type: literature
created: 2025-10-23T16:57:58Z
modified: 2025-10-30T18:20:30Z
citekey: 
---

# NUREG899

Emergency operating procedures should be
*function-oriented*. That means that operators 'do not have
to immediately diagnose an event... to maintain the plant in
a safe configuration." Critical functions are cited as:

1. Containment integrity
2. Reactivity Control
3. Heat Removal
4. Reactor coolant inventory control

Functions  are maintained by 'tasks'. Tasks are specific
actions that are taken to maintain or achieve a function.

This doc says EOPs are verified and validated by:
1. Excercising EOPs on simulators
2. Control room walk-throughs
3. Desk top reviews
4. Seminars
5. Computer modeling and analysis

OPs should minimize the use of cross referencing because it
increases decision times and increases the chance of human
error. It's 'disruptive'.

Operator Aids are things like flowcharts or graphs that can
help an operator learn things more quickly and clearly than
text alone can provide. They should be easily learned and
retained, while being precise and not cluttered.
Interpretability is paramount.

EOPs have segments:
1. Cover page
2. Table of contents if applicable
3. Scope
4. A set of entry conditions
5. Automatic actions that happen by automated systems
6. What the operator should do immediately
7. Things the operator should do afterwards based on
   reference to written procedures
8. Relevant supporting material.

Control rooms should have a sufficient number of EOP
handbooks such that everyone can use one, they're easy to
get to, and also be located such that they don't interfere
with workstations or cover up controls. If there's multiple
control rooms that share a common area, each control room
should have it's own set of EOPs. They should not be sharing
copies, essentially.

Appendix B talks about logical statements. They're written
strangely like program control flow, underlined, and
capitalized:

IF RPS scram has not initiated,
THEN initiate SLC and isolate RWCU
