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:
corporated by reference into NRC regulations as a requirement, then licensees and applicants must comply with that standard as set forth in the regulation. If the secondary reference has been endorsed in a RG as an acceptable approach for RG 1.247, Page 13 meeting an NRC requirement, then the standard constitutes a method acceptable to the NRC staff for meeting that regulatory requirement as described in the specific RG. If the secondary reference has neither been incorporated by reference into NRC regulations nor endorsed in a RG, then the secondary reference is neither a legally-binding requirement nor a “generic” NRC approved acceptable approach for meeting an NRC requirement. However, licensees and applicants may consider and use the information in the secondary reference, if appropriately justified, consistent with current regulatory practice, and consistent with applicable NRC requirements. RG 1.247, Page 14 C. STAFF REGULATORY GUIDANCE C.1 An Acceptable Probabilistic Risk Assessment This section describes one acceptable approach for defining the acceptability of a PRA and its results used in regulatory decision-making for commercial NLWR nuclear power plants. A risk assessment approach is considered to be a PRA when it (1) provides a quantitative assessment of the identified risk in terms of scenarios that result in undesired consequences (e.g., releases of radioactive material, radiological consequences) and their frequencies and (2) is comprised of specific PRA elements for quantifying risk. It is essential that applicants for licenses, certifications, and permits for NLWR designs demonstrate the acceptability of the PRA and its results used to support regulatory decision- making for commercial NLWR nuclear power plants. The same is true for holders of licenses and permits for NLWRs who seek amendments informed by PRA results. The NRC staff assesses the acceptability of the PRA and its results with respect to the scope, level of detail, conformance with