Nuclear Regulatory Commission May 21, 2021 – Federal Register Recent Federal Regulation Documents

The U.S. Nuclear Regulatory Commission (NRC) is soliciting public comment on its draft Interim Staff Guidance (ISG) Supplemental Guidance for Radiological Consequence Analyses Using Alternative Source Terms. This draft ISG proposes changes to the NRC's license amendment request (LAR) review guidance document. This ISG is not intended as standalone guidance but instead supplements NUREG-0800, ``Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR [Light-Water Reactor] Edition'' Section 15.0.1, ``Radiological Consequence Analyses Using Alternative Source Terms.'' NUREG-0800, Section 15.0.1 was published in July 2000 and is not scheduled to be updated for several years. This ISG provides additional guidance for the NRC staff reviewing LARs that request to increase the main steam isolation valve (MSIV) leakage allowed by technical specifications (TS) for boiling water reactors (BWRs).