Alternative Method for Calculating Embrittlement for Steel Reactor Vessels

Document 2025-13817 is a Proposed Rule published by the Nuclear Regulatory Commission in the Federal Register on July 23, 2025. 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. View the original at https://www.federalregister.gov/documents/2025/07/23/2025-13817/alternative-method-for-calculating-embrittlement-for-steel-reactor-vessels.

No. Document 2025-13817 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.