Document: NRC Regulatory Guide
Document ID: 82659041-98b0-4721-b25d-c4fb2ea394d0
Document Type: regulatory_guide
Title: An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1635/ML16358A153.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.174
CFR Part: 
CFR Title: 

Content:
analyses, or information used in previous decisionmaking are changed (e.g., licensee voluntary action) or determined to be in error. When performance monitoring programs are used in the implementation of proposed changes to the licensing basis, those programs should be implemented by using quality assurance provisions commensurate with the safety significance of affected SSCs. An existing PRA or analysis can be utilized to support a proposed licensing basis change, provided it can be shown that the appropriate quality provisions are met. DG-1285, Page 41 6. Documentation 6.1 Introduction To facilitate the NRC staff’s review to ensure that the analyses conducted were sufficient to conclude that the key principles of risk-informed regulation have been met, documentation of the evaluation process and findings are to be maintained. Additionally, the information submitted should include a description of the process used by the licensee to ensure its adequacy and some specific information to support the staff’s conclusion regarding the acceptability of the requested licensing basis change. 6.2 Archival Documentation Archival documentation should include a detailed description of engineering analyses conducted and the results obtained, irrespective of whether they were quantitative or qualitative, or whether the analyses made use of traditional engineering methods or probabilistic approaches. This documentation should be maintained by the licensee, as part of its quality assurance program, so that it is available for examination. Documentation of the analyses conducted to support changes to a plant’s licensing basis should be maintained as lifetime quality records in accordance with RG 1.33, “Quality Assurance Program Requirements (Operation)” (Ref. 42). 6.3 Licensee Submittal Documentation To support the NRC staff’s conclusion that the proposed licensing basis change is consistent with the key principles of risk-informed regulation and NRC staff expectations,