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:
hen the evaluation of an FPP change is based on fire modeling, licensees should document the fact that its fire models and methods meet the NRC requirements. The licensee should also document that the models and methods in the analyses were used within their limitations and with the rigor required by the nature and scope of the analyses. These analyses may use simple hand calculations or more complex computer models, depending on the specific conditions of the scenario being evaluated. NUREG-1934, “Nuclear Power Plant Fire Modeling Analysis Guidelines (NPP FIRE MAG),” issued November 2012 (Ref. 51), and Appendix C to NFPA 805 contain discussions that are useful in determining which fire models to use and applying those fire models within their limitations. Licensees that do not make the transition to an NFPA 805 FPP can use fire models endorsed by the NRC as part of an engineering evaluation process. However, the NRC endorses the fire models, methodologies, data, and examples in these documents only to the extent that they have been or can be adequately verified and validated or to the extent that they are appropriate for the specific application. The NRC and the Electric Power Research Institute (EPRI) have documented the verification and validation (V&V) process for parts of five fire models in NUREG-1824/EPRI 1011999, “Verification and Validation of Selected Fire Models for Nuclear Power Plant Applications,” issued May 2007 (Ref. 52), and 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. 53). The specific fire models documented are (1) FDTs, (2) Fire-Induced Vulnerability Evaluation (FIVE), Revision 1, (3) the National Institute of Standards and Technology (NIST) Consolidated Model of Fire Growth and Smoke Transport, (4) the Electricité de France MAGIC code, and (5) the NIST Fire Dynamics Simulator.