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:
ee of fire damage to achieve and maintain safe shutdown in the event of a fire. “Success path” is synonymous with the safe-shutdown “train free of fire damage” and includes electrical circuits where fire-induced failure could prevent operation or cause maloperation of redundant trains necessary to achieve and maintain hot-shutdown conditions. In the context of Section III.G of Appendix R to DG-1359, Page 112 10 CFR Part 50, redundant train (Section III.G.2) and alternative or dedicated systems (Section III.G.3) are both success paths, and this definition applies to both. SSCs important to safe shutdown: Nuclear power plant SSCs that, if damaged by fire, could prevent safe shutdown. temporary structures: Buildings, tents, shelters, platforms, trailers, or other structures that are erected to support plant operations and maintenance but are not permanent site facilities. turnout gear: Personnel protective clothing for firefighting, such as coats, pants, boots, helmets, gloves, and self-contained breathing apparatuses. transient combustibles: Combustible materials that are not fixed in place or not an integral part of an operating system or component. DG-1359, Page 113 REFERENCES2 1. U.S. Code of Federal Regulations (CFR), “Domestic Licensing of Production and Utilization Facilities,” Part 50, Chapter I, Title 10, “Energy.” 2. CFR, 10 CFR Part 50, Appendix R, “Fire Protection Program for Nuclear Power Facilities Operating Prior to January 1, 1979.” 3. CFR, “Licenses, Certifications, and Approvals for Nuclear Power Plants,” Part 52, Subpart A, “Early Site Permits”; Subpart B, “Standard Design Certifications”; and Subpart C, “Combined Licenses for Nuclear Power Plants,” Chapter 1, Title 10, “Energy.” 4. National Fire Protection Association (NFPA), NFPA 805, “Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generating Plants,” Quincy, MA, 2001.3 5. NRC, Regulatory Guide (RG) 1.205 “Risk-Informed,