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USA: Regulatory Guide: Acceptability of ASME Code, Section III, Division 5, High Temperature Reactors

Updated on : 07-09-2025

USA: Regulatory Guide: Acceptability of ASME Code, Section III, Division 5, High Temperature Reactors

The U.S. Nuclear Regulatory Commission (NRC) is issuing Revision 3 to Regulatory Guide (RG), 1.87, ''Acceptability of ASME Code, Section III, Division 5, ''High Temperature Reactors.'''' This regulatory guide (RG) describes an approach that is acceptable to the staff of the NRC to assure the 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 exceptions and limitations, the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV) Code (ASME Code) Section III, ''Rules for Construction of Nuclear Facility Components,'' Division 5, ''High Temperature Reactors,'' and several related Code Cases.Revision 3 to RG 1.87 is available on 3 September 2025; refer to Power Reactors (Division 1): Regulatory Guides 1.81 - 1.100, accessible at https://www.nrc.gov/reading-rm/doc-collections/reg-guides/power-reactors/rg/division-1/division-1-81.html90 Federal Register (FR) 42627, 3 September 2025:

https://www.govinfo.gov/content/pkg/FR-2025-09-03/html/2025-16899.htm

https://www.govinfo.gov/content/pkg/FR-2025-09-03/pdf/2025-16899.pdfThis action and previous actions notified under the symbol G/TBT/N/USA/2169 are identified by Docket Number NRC-2024-0203. The Docket Folder is available on Regulations.gov at https://www.regulations.gov/docket/NRC-2024-0203/document and provides access to primary documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number. 

Download: USA: Regulatory Guide: Acceptability of ASME Code, Section III, Division 5, High Temperature Reactors

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