WTO notification · TBT
United StatesAdopted, according to its latest notice
Official title
Approval of American Society of Mechanical Engineers Unconditioned Code Cases
The United States issued an addendum on 28 January 2026 to the earlier TBT notification G/TBT/N/USA/2241. Addenda often report that a measure was adopted, changed, postponed or withdrawn. The measure was first notified on 29 September 2025. The comment period closed on 25 November 2025.
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Nuclear power plant engineering standards; Nuclear power plants. Safety
Latest notice (G/TBT/N/USA/2241/Add.2, 28 January 2026)
The latest notice says the measure was adopted or published.
Approval of American Society of Mechanical Engineers Unconditioned Code Cases
The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of 26 January 2026, for the direct final rule that was published in the Federal Register on 26 September 2025 (notified as G/TBT/N/USA/2241/Add.1). This direct final rule amended the regulations to incorporate by reference a regulatory guide that approved unconditioned code cases published by the American Society of Mechanical Engineers. This action allows nuclear power plant applicants and licensees to use the code cases as voluntary alternatives to engineering standards for nuclear power plant components. The effective date of 26 January 2026, for the direct final rule published 26 September 2025 (90 FR 46319), is confirmed. The incorporation by reference of certain material listed in the regulation is approved by the Director of the Federal Register as of 26 January 2026. 91 Federal Register (FR) 3359, 27 January 2026; Title 10 Code of Federal Regulations (CFR) Part 50: This action and previous actions notified under the symbol G/TBT/N/USA/2241 are identified by Docket Number NRC-2024-0163. 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.
Proposed rule - The U.S. Nuclear Regulatory Commission (NRC) is proposing to amend its regulations to incorporate by reference a regulatory guide that approves unconditioned code cases published by the American Society of Mechanical Engineers (ASME). This action would allow nuclear power plant applicants and licensees to use the code cases as voluntary alternatives to engineering standards for nuclear power plant components. These standards are set forth in the ASME Boiler and Pressure Vessel Code and ASME Operation and Maintenance of Nuclear Power Plants, which are currently incorporated by reference into the NRC's regulations. The NRC is requesting comments on this proposed rule.
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
AddendumG/TBT/N/USA/2241/Add.2
Approval of American Society of Mechanical Engineers Unconditioned Code Cases
The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of 26 January 2026, for the direct final rule that was published in the Federal Register on 26 September 2025 (notified as G/TBT/N/USA/2241/Add.1). This direct final rule amended the regulations to incorporate by reference a regulatory guide that approved unconditioned code cases published by the American Society of Mechanical Engineers. This action allows nuclear power plant applicants and licensees to use the code cases as voluntary alternatives to engineering standards for nuclear power plant components. The effective date of 26 January 2026, for the direct final rule published 26 September 2025 (90 FR 46319), is confirmed. The incorporation by reference of certain material listed in the regulation is approved by the Director of the Federal Register as of 26 January 2026. 91 Federal Register (FR) 3359, 27 January 2026; Title 10 Code of Federal Regulations (CFR) Part 50: This action and previous actions notified under the symbol G/TBT/N/USA/2241 are identified by Docket Number NRC-2024-0163. 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.
AddendumG/TBT/N/USA/2241/Add.1
Approval of American Society of Mechanical Engineers Unconditioned Code Cases
The U.S. Nuclear Regulatory Commission (NRC) is amending its regulations to incorporate by reference a regulatory guide that approves unconditioned code cases published by the American Society of Mechanical Engineers (ASME). This action allows nuclear power plant applicants and licensees to use the code cases as voluntary alternatives to engineering standards for nuclear power plant components. These standards are set forth in the ASME Boiler and Pressure Vessel Code and ASME Operation and Maintenance of Nuclear Power Plants, which are currently incorporated by reference into the NRC's regulations. The final rule is effective 26 January 2026, unless significant adverse comments are received by 25 November 2025. If the direct final rule is withdrawn as a result of such comments, timely notice of the withdrawal will be published in the Federal Register. 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. Comments received on this direct final rule will also be considered to be comments on a companion proposed rule (notified as G/TBT/N/USA/2241) published in the Proposed Rules section of this issue of the Federal Register. The incorporation by reference of certain material listed in the regulation is approved by the Director of the Federal Register as of 26 January 2026. 90 Federal Register (FR) 46319, 26 September 2025; Title 30 Code of Federal…
Regular notificationG/TBT/N/USA/2241
Comment deadline: Closed on 25 November 2025
Approval of American Society of Mechanical Engineers Unconditioned Code Cases
Proposed rule - The U.S. Nuclear Regulatory Commission (NRC) is proposing to amend its regulations to incorporate by reference a regulatory guide that approves unconditioned code cases published by the American Society of Mechanical Engineers (ASME). This action would allow nuclear power plant applicants and licensees to use the code cases as voluntary alternatives to engineering standards for nuclear power plant components. These standards are set forth in the ASME Boiler and Pressure Vessel Code and ASME Operation and Maintenance of Nuclear Power Plants, which are currently incorporated by reference into the NRC's regulations. The NRC is requesting comments on this proposed rule.
Expodite writes its summary from the official record. The notification and the documents it notifies are on the WTO's own websites.
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