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:
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 Fire Suppression Systems 4.3.1 Fire Water Supply During decommissioning, the plant fire water supply system should be maintained, and the system should be capable of providing the maximum water flow needed to supply automatic fire suppression systems and manual firefighting. The system should be capable of delivering the maximum water flow demand for a minimum of 2 hours. The following factors should be considered in determining the adequacy of the water supply: DG-1370, Page 18 a. reliability of the water supply source; b. availability of tanks or other water sources, pumps, fire hydrants, and distribution system; c. adequate flow and pressure to meet water flow demands of automatic or manual fire suppression, or both, at the point of delivery; and d. capacity of the water supply source and distribution system. If the water system is a combined domestic, process, and fire system, the system should be capable of supplying the maximum daily consumption or the peak hourly flow rate, whichever is higher, plus the maximum required fire flow. Decommissioning activities may result in the isolation, removal, or abandonment of portions of the distribution system. Any system changes should be reviewed to ensure that adequate flow and coverage are provided for the remaining plant areas that contain radioactive materials, present a fire exposure threat to areas containing radioactive materials, or include systems necessary to mitigate the release of radioactive materials. When temperatures cannot reliably be maintained at or above 4 degrees Celsius (40 degrees Fahrenheit), water-based fire suppression system components should be protected against freezing in accordance with NFPA 13, “Standard for the Installation of Sprinkler Systems” (Ref. 35). Freeze protection for