Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
) are necessary to maintain long-term cooling (i.e., beyond 72 hours) and must 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 a temperature of 215.6 degrees C (420 degrees F) or below for non-LOCA events. This safe-shutdown condition is predicated on demonstration of acceptable passive safety system performance. New reactor designs should not rely on a SISBO to mitigate potential fire damage to safe-shutdown systems. 8.4 Applicable Industry Codes and Standards In general, the FPP for new LWR designs should comply with the provisions specified in NFPA 804, “Standard for Fire Protection for Advanced Light Water Reactor Electric Generating Plants” (Ref. 121), as they relate 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. When conflicts occur, the applicable regulatory requirements and guidance, including the guidance in this RG, will govern. As stated in SRP 9.5.1.1, Appendix A Section 3, the standards of record related to the design and installation of fire protection systems and features required to satisfy NRC requirements in all new reactor designs are those NFPA codes and standards in effect 180 days before the submittal of the application under 10 CFR Part 50 or 10 CFR Part 52. The 180-day deadline is based on the application requirements DG-1359, Page 103 in 10 CFR 50.34(h)(1)(i), 50.34(h)(1)(ii), 52.47(a)(9), 52.79(a)(41), 52.137(a)(9), and 52.157(f)(30). For COL applications that reference a certified design, the standards of record will be those approved for the certified design, except for FPP features that are not included