NOTIFICATION
Addendum
The following communication, dated 4
September 2025, is being circulated at the request of the delegation of the United
States of America.
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Title: Regulatory
Guide: Acceptability of ASME Code, Section III, Division 5, ''High Temperature
Reactors''
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Reason for Addendum:
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Comment period changed - date:
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Notified measure adopted - date:
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Notified measure published - date: 3 September 2025
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Notified measure enters into force - date:
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Text of final measure available from[1]:
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Notified measure withdrawn or revoked - date:
Relevant symbol if measure re-notified:
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Content or scope of notified measure changed and text available from1:
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Interpretive guidance issued and text available from1:
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Description: 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.html.
90 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.pdf
This 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.
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[1] This information can be provided by including a website address, a
pdf attachment, or other information on where the text of the final/modified
measure and/or interpretive guidance can be obtained.