ML25337A147
| ML25337A147 | |
| Person / Time | |
|---|---|
| Issue date: | 12/04/2025 |
| From: | Nicholas Hansing NRC/NRR/DEX/EMIB |
| To: | |
| References | |
| Download: ML25337A147 (3) | |
Text
1 ADAMS Accession No. ML25337A147 STATUS OF NRC ACTIVITIES OF POTENTIAL INTEREST TO ASME OM STANDARDS COMMITTEE Nicholas J. Hansing, Mechanical Engineer Mechanical Engineering and Inservice Testing Branch Division of Engineering and External Hazards NRC Office of Nuclear Reactor Regulation ASME OM Code Committee Meeting December 2025 Clearwater, Florida Recent 10 CFR 50.55a Code Edition Rulemaking Title 10 of the Code of Federal Regulations (10 CFR) in Section 50.55a, Codes and standards, incorporates by reference specific editions and addenda of the American Society of Mechanical Engineers (ASME) Operation and Maintenance of Nuclear Power Plants, Division 1, OM Code:
Section IST (OM Code), and the ASME Boiler and Pressure Vessel Code (BPV Code), Sections III and XI.
On August 30, 2024, the U.S. Nuclear Regulatory Commission (NRC) issued a rulemaking to amend 10 CFR 50.55a to incorporate by reference the 2021 Edition to the ASME BPV Code,Section III, Division 1, and Section XI, Division 1, with conditions; and the 2022 Edition to Division 1 of the ASME OM Code, with conditions. See Federal Register Notice 89 FR 70449, dated August 30, 2024.
Recent 10 CFR 50.55a Code Case Rulemaking In July 2024, the NRC issued a final rulemaking incorporating by reference into 10 CFR 50.55a revised NRC regulatory guides (RGs) that address the acceptability of ASME Code Cases in the Federal Register on July 17, 2024 (89 FR 58039) (corrected on July 29, 2024 (89 FR 60795)) with an effective date of August 16, 2024. In particular, Revision 5 of RG 1.192, Revision 40 of RG 1.84, and Revision 21 of RG 1.147 address the acceptability of ASME OM Code Cases published during the similar time period as the 2022 Edition of the ASME OM Code and available on the ASME Codes &
Standards (C&S) Connect Website; and specific ASME BPV Code Cases. RG 1.192, Revision 5, accepts new ASME OM Code Cases OMN-28 through OMN-30 without conditions, and OMN-31 with conditions. Other ASME OM Code Cases are accepted in the same manner in Revision 5 to RG 1.192 as the previous Revision 4 to RG 1.192.
In this rulemaking, the NRC established an option to extend of the Code of Record (COR) update requirement in 10 CFR 50.55a from 10 years to 20 or 24 years for those licensees that are implementing as their IST and Inservice Inspection (ISI) CORs the 2017 Edition of the ASME OM Code and 2019 Edition of the ASME BPV Code, or later editions and addenda, as incorporated by reference in 10 CFR 50.55a. For a licensee implementing this recent Code edition or later edition as its IST/ISI Program COR, the rule allows a 20-year or 24-year COR update interval depending on
2 whether the licensee is implementing a 10-year or 12-year OM Examination and Test interval and Section XI Inspection interval, as applicable, to the ASME OM and BPV Codes. For background information, see NRC Commission Paper SECY-21-0029 (March 15, 2021), Rulemaking Plan on Revision of Inservice Testing and Inservice Inspection Program Update Frequencies Required in 10 CFR 50.55a (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20273A286); Staff Requirements Memorandum SRM-SECY-21-0029 (November 8, 2021)
(Accession No. ML21312A490); and Commission Paper SECY-22-0075 (August 10, 2022), Staff Requirements SECY-21-0029 Inservice Testing and Inservice Inspection Program Rulemakings Update (Accession No. ML22124A178). See the NRC staff presentation at the Inservice Testing Owners Group (ISTOG) meeting in December 2024 for a description of the implementation process for the new COR intervals.
Ongoing 10 CFR 50.55a Rulemaking for 2023 ASME BPV Code and Code Cases The NRC staff is preparing a proposed 10 CFR 50.55a rulemaking to incorporate by reference the 2023 Edition of the ASME BPV Code and revisions to RGs 1.84, 1.147, and 1.192 to accept with or without conditions recent ASME Code Cases. No ASME OM Code edition in this rulemaking.
Direct Final Rule for Non-Controversial and Unconditioned Code Cases On September 26, 2025, the NRC issued Federal Register Notice 90 FR 46319 to incorporate by reference RG 1.262, Revision 0, ASME Code Cases Approved for Use Without Conditions, in 10 CFR 50.55a under the direct final rule process. This 10 CFR 50.55a amendment will be effective on January 26, 2026, unless significant adverse comments are received by November 25, 2025. If the NRC receives significant adverse comments, then the NRC will publish a document that withdraws this action, and will address the comments in a subsequent final rule or as appropriate. With respect to IST code cases, RG 1.262 would accept ASME Code Case OMN-23, Revision 1, Alternative Rules for Testing Pressure Isolation Valves, with no conditions.
ASME OM-2-2024 Code, Component Testing Requirements at Nuclear Facilities In October 2024, ASME issued the OM-2-2024 Code, Component Testing Requirements at Nuclear Facilities, for inservice testing of pumps, valves, and dynamic restraints (and other-named components that perform similar functions) that may be used in new and advanced nuclear facilities that will include water-cooled and non-water-cooled reactors. The NRC staff is drafting a new regulatory guide (DG-1424) that would accept the ASME OM-2-2024 Code with applicable regulatory positions.
ASME Standard QME-1-2025, Qualification of Mechanical Equipment Used in Nuclear Facilities In November 2025, ASME issued ASME Standard QME-1-2025, Qualification of Mechanical Equipment Used in Nuclear Facilities, to provide qualification provisions for active mechanical equipment to be used in new and advanced nuclear facilities. The ASME QME-1-2025 Standard will allow its more effective use by applicants for the construction and licensing of non-water-cooled reactors. ASME QME-1-2025 assumes that mechanical equipment is typically active by its application such that terminology has been streamlined. The NRC staff is drafting proposed Revision 5 to RG 1.100, Seismic Qualification of Electrical and Active Mechanical Equipment and Functional Qualification of Active Mechanical Equipment for Nuclear Power Plants, that would accept with applicable regulatory positions the ASME QME-1-2023 and QME-1-2025 Standards for public comment.
3 NRC Staff Review of Technical Specification Task Force (TSTF) Proposals The NRC staff is continuing its review of several draft TSTF documents with coordination between the NRC IST staff and the Technical Specifications staff.
Extended Operating Cycles for Pressurized Water Reactor (PWR) Nuclear Power Plants Fuel enrichment improvements might allow PWR nuclear power plants to implement longer operating cycles. In preparation for these extended operating cycles, PWR licensees should ensure that performance data are available for IST components to provide confidence in extending the test intervals for those components. In addition, PWR licensees should ensure that the plant-specific IST Program is updated to reflect this interval change for the applicable components.
Revision 4 to NUREG-1482 The NRC staff has finalized Revision 4 to NUREG-1482, Guidelines for Inservice Testing at Nuclear Power Plants, Inservice Testing of Pumps and Valves and Inservice Examination and Testing of Dynamic Restraints (Snubbers) at Nuclear Power Plants. The NUREG is publicly available at ML25267A104.
ASME/NRC OM Symposium The ASME/NRC Fifteenth OM Symposium took place on July 28-30, 2025, at the North Bethesda Marriott, Rockville, MD. The NRC staff is drafting a NUREG of the proceedings of the Symposium.
ASME-Related Generic Communications and Regulatory Guides No ASME-related generic communication or RGs have been issued by the NRC since the last report (Summer 2025) to the ASME OM Standards Committee