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:
sed to develop or evaluate the PRA; • SSCs, operator actions, and plant operational characteristics affected by the application, including the cause-effect relationships among SSC behavior, operator actions, and plant operational characteristics; • how the cause-effect relationships are mapped onto the PRA elements; • the PRA results that will be used to compare against the applicable acceptance criteria or guidelines including how the comparison was performed; • the scope of risk contributors (hazard groups and modes of operation) included in the PRA to support the application; • the results of the peer reviews of the PRA, PRA upgrades, and use of NDMs, and the results of F&O independent assessments (as discussed in Regulatory Position C.2.2), to include the resolution of all of the peer reviews (i.e., PRA, PRA upgrades, and use of NDMs) and F&O independent assessments; the results should be documented such that it is clear why each requirement is considered to have been met; • the processes for maintaining and upgrading the PRA and the use of NDMs, including the cumulative history of those activities such as the results of peer reviews that were performed as a result of a PRA upgrade or the use of an NDM; • the resolution of the peer review findings for the NDMs if the PRA under consideration includes NDMs that have open finding-level F&Os from the technical assessment peer review against the NDM criteria, as endorsed in Appendix A to this RG. This should also include information associated with NDMs to support a review of the technical acceptability of the NDM by the NRC staff if the licensee’s or applicant’s PRA model includes NDMs that have not been subjected to the technical assessment peer review against the NDM criteria, as endorsed in Appendix A to this RG. Such information should provide, for example, detailed descriptions of the NDM, assumptions, scope, limitations, data used along with the bases for data selection, technical bases, and