AP1000 Design Certification Renewal

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Nuclear Regulatory Commission 10 CFR Part 52 [NRC-2026-2377] RIN 3150-AL70 AGENCY: Nuclear Regulatory Commission. ACTION: Direct final rule and issuance of environmental assessment. SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is amending its regulations to renew the AP1000 design certification and incorporate Revision 20 of the AP1000 design control document. The purpose of this rulemaking action is to update the AP1000 design to be consistent with changes made to the design during the licensing, construction, and operation of Vogtle Electric Generating Plant, Units 3 and 4. This rulemaking incorporates AP1000 design control document Revision 20, which includes updates made to the AP1000 design to represent a current, construction-validated design. The NRC is also issuing an environmental assessment supporting this rule. DATES: The final rule is effective December 28, 2026, unless significant adverse comments are received by November 13, 2026. If the direct final rule is withdrawn as a result of such comments, timely notice of the withdrawal will be published in the Federal Register . (For more on NRC's consideration of comments received, see SUPPLEMENTARY INFORMATION .) The incorporation by reference of certain publications listed in this regulation is approved by the Director of the Office of the Federal Register as of December 28, 2026. ADDRESSES: Submit your comments, identified by Docket ID NRC-2026-2377, at https://www.regulations.gov . If your material cannot…