Data / Federal rules / 2025-18769
Approval of American Society of Mechanical Engineers Unconditioned Code Cases
The Nuclear Regulatory Commission published this final rule in the Federal Register on September 26, 2025. It took effect on January 26, 2026. Comments closed on November 25, 2025.
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What the agency says
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.
Key facts
- Document number
- 2025-18769
- Type
- Final rule
- Action
- Direct final rule
- Agency
- Nuclear Regulatory Commission
- Published
- September 26, 2025
- Takes effect
- January 26, 2026
- Comments due
- November 25, 2025
- Dates
- The final rule is effective January 26, 2026, unless significant adverse comments are received by November 25, 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 If the direct final rule is withdrawn as a result of such comments, timely notice of the withdrawal will be published in the Federal Register.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 published in the Proposed Rules section of this iss
- Docket
- NRC-2024-0163
- Regulation ID (RIN)
- 3150-AL20
- Code of Federal Regulations
- 10 CFR 50
- Topics
- Administrative practice and procedure; Antitrust; Classified information; Education; Fire prevention; Incorporation by reference; Intergovernmental relations; Nuclear power plants and reactors; Penalties; Radiation protection; Reporting and recordkeeping requirements; Whistleblowing
- Pages
- 12
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Everything from the Nuclear Regulatory Commission · Rules on administrative practice and procedure · Rules on antitrust · Rules on classified information · Published in September 2025
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.