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:
ons (including requests for amendments) under 10 CFR Part 50 and early site permit, design certification, combined license, standard design approval, or manufacturing license applications under 10 CFR Part 52 (including requests for amendments). Section 19.2 of NUREG-0800, “Review of Risk Information Used to Support Permanent Plant-Specific Changes to the Licensing Basis: General Guidance,” is designed to guide the NRC staff evaluations of licensee requests for changes to the licensing basis that apply risk insights, as well as guidance developed in selected application-specific RGs and the corresponding chapters of NUREG-0800. • NRC, RG 1.200, “An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities” (Ref. 6), provides an approach for determining whether the base probabilistic risk assessment (PRA), in total or the parts that are used to support an application, is acceptable such that the base PRA can be used in regulatory decision-making for light-water reactors. RG 1.200 endorses a standard developed by the American Society of Mechanical Engineers and the American Nuclear Society (ASME/ANS), which addresses PRA for core damage frequency (CDF) and large early release frequency (LERF) for internal and external hazard groups at-power. Purpose of Regulatory Guides The NRC issues RGs to describe to the public methods that the staff considers acceptable for use in implementing specific parts of the agency’s regulations, to explain techniques that the staff uses in evaluating specific problems or postulated accidents, and to provide guidance to applicants. Regulatory guides are not substitutes for regulations and compliance with them is not required. Methods and solutions that differ from those set forth in RGs will be deemed acceptable if they provide a basis for the findings required for the issuance or continuance of a permit or license by the Commission. Paperwork Reduction Act This RG