Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
ombination of the probability and consequences of a given fire event based on consideration of (1) what can go wrong? (2) how likely is it? and (3) what are the consequences if it occurs? fire stop: A feature of construction that prevents fire propagation along the length of cables or prevents fire from spreading to nearby combustibles within a given fire area or fire zone. fire suppression: Control and extinguishing of fires (firefighting). Manual fire suppression is the use of hoses, portable extinguishers, or manually actuated fixed systems by plant personnel. Automatic fire suppression is the use of automatically actuated fixed systems such as water, Halon, or CO2 systems. fire watch: Individuals responsible for providing additional (e.g., during hot work) or compensatory (e.g., for system impairments) coverage of plant activities or areas to detect fires or to identify activities and conditions that present a potential fire hazard. The individuals should be trained in identifying conditions or activities that present potential fire hazards, as well as in the use of fire extinguishers and the proper fire notification procedures. fire zones: Subdivisions of fire areas. free of fire damage: The SSCs (including electrical circuits) under consideration are capable of performing their required post-fire safe-shutdown functions during and after the postulated fire, as needed, without repair. The crediting of operator actions to restore damaged SSCs or to mitigate the consequences of the fire-induced damage should be in accordance with Regulatory Position 5.3.1.3 of this guide. hazardous material: A substance that, upon release, has the potential to cause harm to people, property, or the environment. DG-1359, Page 109 high-impedance fault: A circuit fault condition resulting in a short-to-ground, or conductor-to-conductor hot short, where residual resistance in the faulted connection maintains the fault current level below the long-term setpoint of the component’s