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: 

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permit should demonstrate how the application meets them. C.4 Probabilistic Risk Assessment Documentation in Support of a Regulatory Decision PRA documentation should be sufficient to allow the staff to determine the acceptability of the PRA and the PRA results used to support the application under consideration. Thus, the PRA documentation should include information necessary for the staff to gain a full understanding of the technical bases of the PRA and how the assessment and its results are used to support the application. While developing an application, the applicant or holder of a license, certificate, or permit documents the PRA model and the analyses performed to support the application under consideration. This PRA documentation comprises both archival (i.e., available for audit or inspection) and submittal (i.e., submitted as part of the risk-informed request) documentation. Archival PRA documentation may be required on an as -needed basis to facilitate the NRC staff’s review of the application. In general, all PRA documentation should be retrievable, complete, and updated as needed based on an approved configuration control process to help ensure that the PRA and its results used to support a given application represent the as-designed, as-to-be-built, and as-to-be-operated plant or the as -built and as -operated plant. Application-specific guidance indicates how to meet documentation submittal requirements for a specific application. If available, application-specific guidance may provide specific guidance on archival PRA documentation and information that should be included with a submittal. However, in the absence of such application-specific guidance, Regulatory Positions C.4.1 and C.4.2 provide generic characteristics and attributes of archival and submittal documentation that should otherwise be achieved. C.4.1 Archival Probabilistic Risk Assessment Documentation Certain generic characteristics and attributes of archival PRA documentation are