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:
it analysis, and judgement may be required to address the diverse modeling required. With respect to the NMAs that provide notes on specific supporting requirements (SRs), the NRC understands that the JCNRM’s underlying purpose was to clarify the intent of a supporting requirement (SR), explain jargon that might be used in an SR, and/or provide examples of analysis approaches that would meet the intent of the SR. Accordingly, this RG does not endorse or approve for use any of the NMAs contained in ASME/ANS RA-S-1.4-2021. This lack of endorsement or approval for use does not necessarily mean that the NRC disapproves the substance nor limits the use of the information provided in the NMAs or that the NRC is limiting the use of that information. Applicants and licensees should meet the applicable requirements of ASME/ANS RA-S-1.4-2021 regardless of whether they use some or all of the information provided in the NMAs. Tables A-1 through A-22 provide the staff’s position on each of the requirements of the standard. The tables present the staff’s concern (issue) and the staff’s proposed resolution. In the proposed staff resolution, the staff clarification or qualification of the requirement is indicated in either bolded text (i.e., bold) or strikeout text (i.e., strikeout); that is, the tables provide the additions or deletions to the requirement (as written in the ASME/ANS RA-S-1.4-2021 PRA standard) necessary for the staff to have no objection. Italic text (i.e., italic) is used to denote an NRC commentary that does not involve any changes to the requirement. As stated in Management Directive (MD) 6.6, “Regulatory Guides” (Ref. 2), in a regulatory guide, endorsement of a document, or part of a document, means that the staff has evaluated the material and has found that it is acceptable for use, either in whole or in part, and allowed for use by licensees as discussed within the RG. The staff endorsement on this RG does not intend to provide a new