WTO notification · TBT
United StatesUpdated: check whether it is now adopted or in force
Official title
Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities
The United States issued an addendum on 27 October 2026 to the earlier TBT notification G/TBT/N/USA/2288. Addenda often report that a measure was adopted, changed, postponed or withdrawn. The measure was first notified on 8 June 2026. The comment period closed on 6 July 2026.
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Nuclear facilities component testing; Test conditions and procedures in general; Nuclear power plants. Safety
The comment period closed on 6 July 2026. You can still raise concerns about the measure with your country's WTO TBT enquiry point, quoting the document symbol G/TBT/N/USA/2288/Add.1; it can take them up with the United States.
Find your country's enquiry point on WTO ePing (opens in a new tab)Latest notice (G/TBT/N/USA/2288/Add.1, 27 October 2026)
Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities
The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of 18 August 2026, for Revision 0 of Regulatory Guide (RG) 1.220, ''Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities.'' The RG was noticed in the Federal Register on 4 June 2026 (notified as G/TBT/N/USA/2288), with a follow up Correction to the Notice, published on 22 June 2026 (notified as G/TBT/N/USA/2288/Corr.1), stating the effective date of 18 August 2026. This new RG endorses, with a regulatory position, the American Society of Mechanical Engineers (ASME) Operation and Maintenance OM-2 Code, Component Testing Requirements at Nuclear Facilities, 2024 Edition, and describes an approach that is acceptable to the NRC staff for the development and implementation of an Inservice Testing (IST) Program for all types of nuclear facilities. The effective date of 18 August 2026, for the direct final RG 1.220, Revision 0, published on 4 June 2026 (91 FR 33770), as corrected on 22 June 2026 (91 FR 37152), is confirmed. 91 Federal Register (FR) 67337, 26 October 2026: This direct final guide; confirmation of effective date notified as G/TBT/N/USA/2288 are identified by Docket Number NRC-2025-0677. The Docket Folder is available on Regulations.gov at and provides access to primary documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
Direct final guide; issuance and post-promulgation comment period - The U.S. Nuclear Regulatory Commission (NRC) is issuing Regulatory Guide (RG) 1.220, Revision 0, ''Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities.'' This new RG endorses, with a regulatory position, the American Society of Mechanical Engineers (ASME) Operation and Maintenance OM-2 Code, Component Testing Requirements at Nuclear Facilities, 2024 Edition, and describes an approach that is acceptable to the NRC staff for the development and implementation of an Inservice Testing (IST) Program for all types of nuclear facilities. This RG is effective on the date of Federal Register Notice publication, with a 30-day post-promulgation comment period.
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
AddendumG/TBT/N/USA/2288/Add.1
Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities
The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of 18 August 2026, for Revision 0 of Regulatory Guide (RG) 1.220, ''Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities.'' The RG was noticed in the Federal Register on 4 June 2026 (notified as G/TBT/N/USA/2288), with a follow up Correction to the Notice, published on 22 June 2026 (notified as G/TBT/N/USA/2288/Corr.1), stating the effective date of 18 August 2026. This new RG endorses, with a regulatory position, the American Society of Mechanical Engineers (ASME) Operation and Maintenance OM-2 Code, Component Testing Requirements at Nuclear Facilities, 2024 Edition, and describes an approach that is acceptable to the NRC staff for the development and implementation of an Inservice Testing (IST) Program for all types of nuclear facilities. The effective date of 18 August 2026, for the direct final RG 1.220, Revision 0, published on 4 June 2026 (91 FR 33770), as corrected on 22 June 2026 (91 FR 37152), is confirmed. 91 Federal Register (FR) 67337, 26 October 2026: This direct final guide; confirmation of effective date notified as G/TBT/N/USA/2288 are identified by Docket Number NRC-2025-0677. The Docket Folder is available on Regulations.gov at and provides access to primary documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
CorrigendumG/TBT/N/USA/2288/Corr.2
Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities
This corrigendum further revises the notification to correct the notification basis. The measure should be notified only under 'Other' rather than under Article 2.9.2. This correction does not affect the substance of the measure or the previous corrigendum concerning the effective date of Regulatory Guide, 1.220, Revision 0.
CorrigendumG/TBT/N/USA/2288/Corr.1
Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities; Correction
The U.S. Nuclear Regulatory Commission (NRC) is correcting a notice that was published in the Federal Register on 4 June 2026 (notified as G/TBT/N/USA/2288), regarding Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities, issuance and post-promulgation comment period. This action is necessary to correct the effective date of Regulatory Guide, 1.220, Revision 0. The correction takes effect on 22 June 2026. 91 Federal Register (FR) 37152, 22 June 2026: This correction and the direct final guide; issuance and post-promulgation comment period notified as G/TBT/N/USA/2288 are identified by Docket Number NRC-2025-0677. The Docket Folder is available on Regulations.gov at and provides access to primary documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number. Post-promulgation comments must be received by 6 July 2026. Comments received after this date will be considered if it is practical to do so, but the NRC is able to ensure consideration only for comments received on or before this date. WTO Members and their stakeholders are asked to submit comments to the USA TBT Enquiry Point by or before 4pm Eastern Time on 6 July 2026. Comments received by the USA TBT Enquiry Point from WTO Members and their stakeholders will be shared with the NRC and will also be submitted to the Docket on Regulations.gov if received within the comment period.
Regular notificationG/TBT/N/USA/2288
Comment deadline: Closed on 6 July 2026
Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities
Direct final guide; issuance and post-promulgation comment period - The U.S. Nuclear Regulatory Commission (NRC) is issuing Regulatory Guide (RG) 1.220, Revision 0, ''Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities.'' This new RG endorses, with a regulatory position, the American Society of Mechanical Engineers (ASME) Operation and Maintenance OM-2 Code, Component Testing Requirements at Nuclear Facilities, 2024 Edition, and describes an approach that is acceptable to the NRC staff for the development and implementation of an Inservice Testing (IST) Program for all types of nuclear facilities. This RG is effective on the date of Federal Register Notice publication, with a 30-day post-promulgation comment period.
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