Document: NUREG-0800
Document ID: 69433f0d-1a24-4cf6-b8b9-31109f9f51c5
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190014.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
re a safe-shutdown state. Post-fire safe shutdown for currently operating LWRs is defined in RG 1.189 as those conditions specified in the Technical Specifications. RG 1.139 specifies Cold Shutdown as 93.3 EC (200 EF) for PWRs and 100 EC (212 EF) for BWRs. Passive reactor designs are limited by the inherent ability of the passive heat removal processes and cannot reduce the temperature of the reactor coolant system below the boiling point of water for heat transfer to occur between the reactor coolant and the heat sink. The plant designs include cooling systems to bring the reactor to cold shutdown or refueling condition; however, these systems are not safety grade. These non-safety-grade systems (i.e., makeup water to the heat sink and cool-down capability) are necessary to maintain long-term cooling (i.e., beyond 72 hours) and should be capable of accomplishing their respective functions without damage to the fuel as demonstrated by design and analysis. Based on the discussion and recommendations of SECY-94-084, the passive decay heat removal systems should be capable of achieving and maintaining 215.6 EC (420 EF) or below for non-loss-of-coolant-accidents (non-LOCA) events. This safe-shutdown condition is predicated on demonstration of acceptable passive safety system performance and the acceptable resolution of RTNSS that are necessary for long-term shutdown. 3. Applicable Industry Codes and Standards In general, the FPP for new light water reactor designs should comply with the provisions specified in NFPA 804, “Fire Protection for Advanced Light Water Reactors,” related to the protection of post-fire safe-shutdown capability and the mitigation of a radiological release resulting from a fire. However, the NRC has not formally endorsed NFPA 804, and some of the guidance in the NFPA standard may conflict with regulatory requirements. Where conflicts occur, the applicable regulatory requirements and guidance will govern. The standards of record related to the