Document: NRC Regulatory Guide
Document ID: edb75cf4-27e1-4166-989c-25781bd48b98
Document Type: regulatory_guide
Title: Fire Protection Program for Nuclear Power Plants During Decommissioning and Permanent Shutdown (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2007/ML20078K920.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.191
CFR Part: 
CFR Title: 

Content:
the same area. The exposure to fire effects (e.g., smoke, heat, ignition) may affect the capabilities of adjacent structures, systems, and components to prevent or mitigate the release of radioactive material. DG-1370, Page 30 Fire hazard. Conditions necessary to initiate and support combustion, including in situ or transient combustible materials, ignition sources (e.g., heat, sparks, open flames), and an oxygen environment. Fire model. Mathematical prediction of fire growth, environmental conditions, and potential effects on structures, systems, or components based on the conservation equations or empirical data. Fire-retardant material. Material that has been coated or treated with chemicals, paints, or other materials designed to reduce the combustibility of the material. Fire risk. The combination of the probability of a fire event and the estimated consequences of the event. Fire scenario. A description of a fire and any factors affecting or affected by it from ignition to extinguishment, including, as appropriate, ignition sources, nature and configuration of the fuel, ventilation characteristics and locations of occupants, condition of the supporting structure, and conditions and status of operating equipment. Fire watch. One or more persons responsible for providing additional coverage (e.g., during hot work) or compensatory coverage (e.g., for system impairments) of plant activities or areas for the purpose of detecting fires or identifying activities and conditions that present a potential fire hazard. The person or persons should be trained in identifying conditions or activities that present potential fire hazards and in the use of fire extinguishers and the proper fire notification procedures. Hot work. Activities (such as cutting, welding, and grinding) that involve the use of heat, sparks, or open flame and that are typically controlled by a formal work permit system controlled or reviewed by a fire protection engineer. Impairment. Degradation of a