Document: NUREG-0800
Document ID: 9c59dff8-9325-43e2-8e81-843a0f6b4b2f
Document Type: srp
Title: and Regulatory Guide 1.189.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0327/ML032740044.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
o manage the aging effects for the pressure boundary can be in the form of existing plant programs, modified (or enhanced) programs, or new programs specifically created to address aging concerns. The development of modified or newly created programs is dependent upon (1) the aging effect that needs to be managed, and (2) the ability of the current program to manage the aging effect throughout the period of extended operation. Revision 4 - October 2003 55 APPENDIX D: Supplemental Fire Protection Review Criteria for Fire Probabilistic Risk Assessments (PRA) 1.0 Fire Risk Assessment Generic Letter 88-20, Supplement 4, requested licensees to perform individual plant examinations of external events (IPEEE), to assess severe accident vulnerabilities, including vulnerabilities to internal fire events. 10 CFR Part 52.47(a)(v) requires that new applications submitted under Part 52 include a design specific fire risk assessment. The specific objectives of the fire risk assessment are to: 1. develop an appreciation of severe accident behavior; 2. understand the most likely severe accident sequences that could occur at the plant under full power operating conditions; 3. gain a qualitative understanding of the overall likelihood of core damage and radioactive material release; and 4. reduce the overall likelihood of core damage and radioactive material releases by modifying hardware and procedures that would help prevent or mitigate severe accidents, if necessary. Methods previously determined acceptable to the staff for performing a fire risk assessment are a level 1 fire PRA as described in NUREG/CR-2300, a simplified fire PRA as described in NUREG/CR-4840, or the Electric Power Research Institute’s Fire Vulnerability Evaluation (FIVE) methodology. The licensee may use the COMPBRN code to model fire propagation, provided that the shortcomings identified in NUREG/CR-5088, “Fire Risk Scoping Study,” developed by Sandia National Laboratory, are addressed. When the licensee