Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
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:
ties for NLWRs1: • 10 CFR Part 50 provides for the licensing of production and utilization facilities pursuant to the Atomic Energy Act of 1954, as amended, and Title II of the Energy Reorganization Act of 1974. o 10 CFR 50.71(h)(1) requires that (1) each holder of a COL under Subpart C of 10 CFR Part 52 shall develop a Level 1 and a Level 2 PRA, and (2) the PRA must cover those initiating events and modes for which NRC-endorsed consensus standards on PRA exist 1 year before the scheduled date for initial loading of fuel. o 10 CFR 50.71(h)(2) requires that (1) each holder of a COL shall maintain and upgrade the PRA required by 10 CFR 50.71(h)(1), (2) the upgraded PRA must cover initiating events and modes of operation contained in NRC-endorsed consensus standards on PRA in effect 1 year before each required upgrade, and (3) the PRA must be upgraded every 4 years until the permanent cessation of operations under 10 CFR 52.110(a). o 10 CFR 50.71(h)(3) requires that each holder of a COL shall, no later than the date on which the licensee submits an application for a renewed license, upgrade the PRA required by 10 CFR 50.71(h)(1) to cover all modes and all initiating events. • 10 CFR Part 52 governs the issuance of early site permits (ESPs), standard DCs, COLs, SDAs, and MLs for nuclear power facilities pursuant to the Atomic Energy Act of 1954, as amended, and Title II of the Energy Reorganization Act of 1974. o 10 CFR 52.47(a)(27) requires that applicants for a standard DC under Subpart B of 10 CFR Part 52 shall describe the design-specific PRA and its results. o 10 CFR 52.79(a)(46) requires that applicants for a COL under Subpart C of 10 CFR Part 52 shall describe the plant-specific PRA and its results. o 10 CFR 52.79(c)(1) requires that applicants for a COL under Subpart C of 10 CFR Part 52 that reference an SDA under Subpart E of 10 CFR Part 52 shall use and update the PRA 1 See the Background discussion in Section B of this RG for additional information about