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:
............................ 113 APPENDIX A: EQUIVALENCY .............................................................. Error! Bookmark not defined. APPENDIX B: TESTING AND QUALIFICATION OF ELECTRICAL RACEWAY FIRE BARRIER SYSTEMS .......................................................................................... B-1 REFERENCES FOR APPENDIX B ........................................................................................................ B-9 DG-1359, Page 9 B. DISCUSSION Reason for Revision This revision of the guide (Revision 4) addresses new issues identified since the guide was previously revised and released in 2018. This includes incorporation of the latest guidance on fire-induced circuit failures. Specifically, Section C 5.3, “Fire Protection of Safe Shutdown Capabilities,” includes new guidance on multiple high impedance faults, open secondary circuits on current transformers, and shorting switches. Section C 5.3 also includes partial endorsements of Nuclear Energy Institute (NEI) 00-01, “Guidance for Post-Fire Safe-Shutdown Circuit Analysis,” Revision 4, issued September 2016 (Ref. 27). In addition, Section C 5.3 contains guidance based on NUREG/CR-7150, “Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE),” Volumes 1, 2, and 3 (Refs. 28, 29, and 30). NUREG/CR-7150 is a consensus report by technical experts on issues related to post-fire circuit analysis, including multiple spurious operations (MSOs). Background The primary objectives of FPPs at U.S. nuclear power plants are to minimize both the probability of occurrence and the consequences of fire. To meet these objectives, the FPPs for operating nuclear power plants are designed to provide reasonable assurance, through defense in depth, that a fire will not prevent the necessary safe-shutdown functions from being performed and that radioactive releases to the environment in the event of a fire will be minimized. The overall maturity of fire