Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
ications. The following are other related NEI guidance documents on PRA peer review from which NEI 17-07, Revision 2, was developed: • NEI 00-02, “Probabilistic Risk Assessment Peer Review Process Guidance” (Ref. 29); DG-1362, Page 8 • NEI 05-04, “Process for Performing Follow-On PRA Peer Reviews Using the ASME PRA Standard” (Ref. 30); • NEI 07-12, “Fire Probabilistic Risk Assessment (FPRA) Peer Review Process Guidelines” (Ref. 31); • NEI 12-13, “External Hazards PRA Peer Review Process Guidelines” (Ref. 32), as accepted by the NRC by letter dated March 7, 2018 (Ref. 33); and • NEI Appendix X, “Final Revision of Appendix X to NEI 05-04/07-12/12-06, ‘Close-Out of Facts and Observations’” (Ref. 34), as accepted by the NRC by letter dated May 3, 2017 (Ref. 35). This revision provides guidance on one way to determine the acceptability needed for a base PRA that is used in a risk-informed integrated decision-making process. More specifically, this RG provides guidance in the following four areas: 1. defining the acceptability of a base PRA 2. the NRC’s position on national consensus PRA standards, industry PRA peer review process documents, and other related industry documents 3. demonstration that the base PRA, in total or the parts that are used to support an application, used in regulatory applications is acceptable 4. documentation to support a regulatory decision This RG does not address non-PRA approaches such as bounding analyses; rather, this guide only addresses PRA approaches. Instead, NUREG-1855 provides guidance on how to perform acceptable bounding analyses and on limiting the scope of the application. Regulatory guides addressing specific applications, such as RG 1.201, allow for the use of PRAs that are not full-scope (e.g., they may not include contributions from external initiating events or low-power and shutdown (LPSD) modes of operation). Those RGs do, however, state that the missing PRA scope items are to be