Document: NRC Regulatory Guide
Document ID: 8a2332d3-66ca-40af-84e1-507db8b26559
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
...................................................................................................... A-82 Table A-21. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Peer Review ................................................................................................................................................................ A-83 Table A-22. Staff Position on ASME/ANS RA-S-1.4-2021, Newly Developed Methods .................... A-84 Table B-1. List of Hazards ....................................................................................................................... B-2 Table B-2. List of Hazard Causes and Conditions ................................................................................. B-68 RG 1.247, Page 8 List of Figures Figure 1. NRC general framework for achieving PRA acceptability ......................................................... 11 RG 1.247, Page 9 B. DISCUSSION Reason for Issuance This RG provides guidance on one acceptable approach the NRC staff has developed for determining whether a design-specific or plant-specific PRA used to support an application is sufficient to provide confidence in the results, such that the PRA can be used in regulatory decision-making for NLWRs. This RG is being issued consistent with OMB Circular A-119, "Federal Participation in the Development and Use of Voluntary Consensus Standards and in Conformity Assessment Activities" (Ref. 15), which directs Federal Government agencies and agency employees to use voluntary consensus standards, both domestic and international, in its regulatory and procurement activities in lieu of Government-unique standards, unless use of such standards would be inconsistent with applicable law or otherwise impractical. Accordingly, the NRC established processes for the review and endorsement of published voluntary consensus standards. On February 8, 2021, ASME and ANS jointly published a voluntary consensus standard for NLWR PRA, ASME/ANS