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:
ater-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 sprinkler system components should be reviewed regularly during decommissioning activities. Decommissioning activities should not be allowed to affect the water supply to the operating units, or the fire water supplies and distribution systems that are shared at multiunit sites, and the capability to isolate the units should be maintained. The design and installation of the water supply systems should be based on the applicable guidance in NFPA 20, “Standard for the Installation of Stationary Pumps for Fire Protection” (Ref. 36); NFPA 22, “Standard for Water Tanks for Private Fire Protection” (Ref. 37); NFPA 24, “Standard for the Installation of Private Fire Service Mains and Their Appurtenances” (Ref. 38); and NFPA 801. 4.3.2 Automatic Fire Suppression Systems Automatic fire suppression systems that exist when a plant enters the decommissioning phase should be kept operable based on the fire hazards analysis; these systems should be able to protect plant egress routes for evacuation of plant personnel in a fire. Automatic fire suppression systems should be provided where flammable or combustible materials are used or stored. Construction of new or temporary structures to support decommissioning may require the installation of automatic systems based on the fire and radiological hazards of the structures. Factors to consider in selecting the type of suppression system to be installed are the types of fire hazards and health hazards, cleanup of the suppression agent, and the effect of the suppression agent on vital SSCs in the area. The design, installation, and operation of automatic fire protection systems should be based on NFPA 11, “Standard for Low-, Medium-, and High-Expansion Foam” (Ref. 39); NFPA 12, “Standard on Carbon Dioxide Extinguishing