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:
nitiates a fire alarm. b. Automatic fire detection systems using smoke, heat, or flame detectors, as appropriate, are maintained for early detection of fires. The alarm system maintains supervision of automatic fire suppression system control functions, as appropriate. 4.2 Fire Barriers 4.2.1 Designating Fire Areas Fire areas are established to prevent or restrict the propagation of fires from one area of a facility to another, to protect personnel, and to limit the consequences of a fire. For operating reactors, fire area boundaries are generally based on the need to separate and protect safe-shutdown systems. Based on a fire hazards analysis, fire areas may be redesignated to address the unique hazards and protection requirements of the decommissioning process. The designation of fire areas should be based on consideration of the hazards present; the potential for a fire in a given area to result in an unacceptable release of radioactive materials; the ability to effectively contain, fight, and control the fire using manual suppression; and the ability of personnel to safely evacuate the plant. 4.2.2 Fire Barrier Requirements Fire areas should be separated by fire-rated barriers. The fire-resistance rating of a fire barrier should be commensurate with the potential fire severity in each fire area. The components of fire barriers are walls, ceilings, and floors, along with structural supports such as beams, joists, and columns. Openings in a fire barrier should be sealed by the installation of fire dampers, fire door assemblies, fire window assemblies, fire-rated penetration seals, and special floor drains. Fire barrier components and seals should be qualified by testing. The design and installation of fire barriers should be based on the applicable guidance in NFPA 80, “Standard for Fire Doors and Other Opening Protectives” (Ref. 34), NFPA 221, and NFPA 801. The fire hazards analysis should identify and justify any unprotected openings in a fire barrier. 4.3