Federal Register #NRC20220052

NRC issues trial Regulatory Guide for Probabilistic Risk Assessment in Non-Light Water Reactors

The U.S. Nuclear Regulatory Commission (NRC) is releasing Revision 1 to Trial Regulatory Guide (RG) 1.247 for public comment. - Purpose: To provide an acceptable approach for evaluating probabilistic risk assessment (PRA) results in non-light water reactor (NLWR) risk-informed activities - Audience: Potential applicants for NLWR projects and stakeholders in nuclear regulatory processes - No products or services are being procured; this is a request for public input on regulatory guidance - No Original Equipment Manufacturers (OEMs) or vendors are mentioned - The guide will be used during a 3-year trial period, with possible revisions based on stakeholder feedback and experience - Notable requirement: Public comments are requested to inform future updates to the guide - The guide is intended to support regulatory decision-making for NLWR risk-informed activities

Description

The U.S. Nuclear Regulatory Commission (NRC) is issuing for trial use, Revision 1 to Trial Regulatory Guide (RG) 1.247, which provides guidance on determining the acceptability of probabilistic risk assessment (PRA) results for non-light water reactors (NLWRs) and risk-informed activities. This guide describes an acceptable approach to ensure confidence in PRA results used in regulatory decision-making. The trial guide was originally issued in March 2022 with a 2-year trial period ending in May 2024, and this revision allows continued use while addressing remaining technical issues. The NRC is requesting public comments on this trial guide, with a comment period ending October 19, 2026, followed by a 3-year trial use period.

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