Document: NRC Regulatory Guide
Document ID: 666e1303-0170-4974-a7d6-af27eb586524
Document Type: regulatory_guide
Title: Risk-Informed, Performance-Based Fire Protection for Existing Light-Water Nuclear Power Plants (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2104/ML21048A448.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.205
CFR Part: 
CFR Title: 

Content:
d valves. Licensees that use thermal overload protection to prevent damage to motor-operated valves should use the guidance in RG 1.106. The types of failures described in IN 92-18 are an example of a failure mechanism that may not have been considered during the postfire safe-shutdown analysis. Protecting against this one type of failure does not preclude the requirement to address other possible fire-induced failure mechanisms. 4. NFPA 805 Analytical Methods and Tools 4.1 General NFPA 805, Section 2.7.3, has requirements for the quality of engineering analyses and associated methods that the licensee applies to demonstrate compliance with the performance criteria for nuclear safety and radioactive release. 4.2 Fire Models NEI 04-02, Section 5.1.2, provides guidance on the fire models that licensees may use in an NFPA 805 transition, compliance with the NFPA 805 fire modeling requirements, and fire model verification and validation (V&V). The NRC staff and the Electric Power Research Institute (EPRI) have documented the V&V for five fire models in NUREG-1824 (EPRI 1011999), “Verification and Validation of Selected Fire Models RG 1.205, Revision 2, Page 25 for Nuclear Power Plant Applications,” issued May 2007 (Ref. 28). The specific fire models are (1) NUREG-1805, “Fire Dynamics Tools (FDTs) Quantitative Fire Hazard Analysis Methods for the U.S. Nuclear Regulatory Commission Fire Protection Inspection Program,” issued December 2004 (Ref. 29), (2) Fire-Induced Vulnerability Evaluation (FIVE), Revision 1, which is part of NUREG-1824, (3) the National Institute of Standards and Technology (NIST) Consolidated Model of Fire Growth and Smoke Transport (CFAST), (4) the Electricité de France (EdF) MAGIC code, and (5) NIST’s Fire Dynamics Simulator (FDS).7 The NRC accepts the use of these models to perform the performance-based evaluations in NFPA 805, Section 4.2.4, if each model is shown to have been appropriately applied within the range of its applicability