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:
teria, before implementation of the plant change. According to 10 CFR 52.47(a)(v), new reactor applications submitted under 10 CFR Part 52, “Licenses, Certifications, and Approvals for Nuclear Power Plants,” must include a design-specific PRA. A detailed fire PRA is not necessarily required for a new reactor FPP. However, if an applicant for a combined license (COL) references a certified design and if that certified design developed a fire PRA, then the COL applicant should use that PRA and update it to reflect site- and plant-specific information that may not have been available at the design stage. In addition, a licensee that has a risk-informed, performance-based FPP (similar to a National Fire Protection Association (NFPA) 805 program) or that plans to evaluate plant changes using a risk-informed approach must have a detailed fire PRA. The term “fire PRA” encompasses all levels and types of PRAs, ranging from a simplified bounding analysis to a detailed analysis in accordance with NUREG/CR-6850, “EPRI/NRC-RES Fire PRA Methodology for Nuclear Power Facilities,” issued September 2005 (Ref. A-1). NUREG/CR-6850 and NUREG/CR-6850, Supplement 1, “Fire Probabilistic Risk Assessment Methods Enhancements,” issued September 2010, should be the basis for the review of the proposed methodologies. Chapter 19, “Severe Accidents,” of NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition” (SRP), contains additional guidance on the review of nuclear power plant PRAs. The American Nuclear Society has developed a standard for fire PRA (ANSI/ANS- 58.23-2007, “Fire PRA Methodology”) (Ref. A-2). A fire PRA should receive a peer review to the extent that adequate industry guidance is available. The NRC should review and accept the industry guidance before its application to specific fire PRAs. The NRC should also review the results of the plant-specific peer reviews. All types and levels of fire