Data / Federal rules / 2025-13817
Alternative Method for Calculating Embrittlement for Steel Reactor Vessels
The Nuclear Regulatory Commission published this proposed rule in the Federal Register on July 23, 2025.
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What the agency says
The U.S. Nuclear Regulatory Commission (NRC) is denying a petition for rulemaking, dated August 19, 2019, submitted by Thomas A. Bergman on behalf of NuScale Power, LLC. The petition was docketed by the NRC on September 11, 2019, and was assigned Docket No. PRM-50-120. The petitioner requested that the NRC revise its regulations to add an alternative formula for calculating the mean value of the transition temperature shift described in American Society for Testing and Materials Standard E900-15 to the NRC's regulations and guidance documents. The NRC is denying the petition because the petitioner did not demonstrate the immediacy of any safety issues in the concerns raised in the petition and did not provide any new information that would warrant revision of the NRC's regulations.
Key facts
- Document number
- 2025-13817
- Type
- Proposed rule
- Action
- Petition for rulemaking; denial
- Agency
- Nuclear Regulatory Commission
- Published
- July 23, 2025
- Dates
- The docket for the petition for rulemaking PRM-50-120 is closed on July 23, 2025.
- Docket
- Docket No. PRM-50-120; NRC-2019-0180
- Code of Federal Regulations
- 10 CFR 50
- Pages
- 4
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Everything from the Nuclear Regulatory Commission · Published in July 2025
Read from the Federal Register API, last updated 2026-10-24. 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.