Nuclear Regulatory Commission August 20, 2021 – Federal Register Recent Federal Regulation Documents

The U.S. Nuclear Regulatory Commission (NRC) is issuing for public comment a draft regulatory guide (DG), DG-1380 (proposed Revision 2 to Regulatory Guide [RG] 1.87), ``Acceptability of ASME Code Section III, Division 5, `High Temperature Reactors''' and accompanying draft NUREG-2245, ``Technical Review of the 2017 Edition of ASME Section III, Division 5, `High Temperature Reactors,''' that documents the NRC staff's review of the 2017 Edition of ASME Section III, Division 5, certain portions of the 2019 Edition, and associated Code Cases N-861 and N-862. This DG describes an approach that is acceptable to the staff of the NRC to meet regulatory requirements for mechanical/ structural integrity of components that operate in elevated temperature environments and that are subject to time-dependent material properties and failure modes. It endorses, with conditions, the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (ASME Code) Section III, ``Rules for Construction of Nuclear Facility Components,'' Division 5, ``High Temperature Reactors.'' The draft NUREG provides the technical basis for DG-1380.