U.S. nuclear regulator issues rule renewing Westinghouse reactor design certification for 40 years
Key Facts
The U.S. Nuclear Regulatory Commission issued a direct final rule renewing and updating the design certification for Westinghouse's AP1000 reactor, according to the rule published on October 14, 2026. The renewal extends for 40 years from the rule's effective date and updates the technical reference underpinning applications to license new units. The move incorporates Revision 20 of the design control document, drawing on changes implemented during the licensing, construction and operation of the Vogtle plant. The existing certification was due to expire on February 27, 2046, before renewal, according to the accompanying regulatory document. The design control document sets out the technical details of the standard design and serves, according to Westinghouse, as a key reference for licensing new units.
The update focuses on incorporating practical experience from Vogtle into the reference design to reduce repeated reviews of changes already assessed, according to the commission. During the licensing, construction and operation of the plant's new units, Southern Nuclear submitted more than 180 license amendment requests. These requests covered design changes, issues arising during construction and operational improvements, according to the accompanying regulatory document. The commission's review concluded that the update contains no new changes requiring additional technical review. It brings together previously approved changes and others implemented under procedures that do not require prior approval into the reference that applicants will use to license subsequent projects.
The original design certification rule dates to January 27, 2006, when it was published by the U.S. Nuclear Regulatory Commission. Vogtle Unit 3 then entered commercial operation on July 31, 2023, according to Georgia Power. Unit 4 followed on April 29, 2024, adding operating experience to the licensing and construction experience underpinning the update. In April 2026, Westinghouse announced that Unit 4, in its as-built configuration, had been selected as the standard reference unit for new reactor projects. The final safety evaluation report supporting the design certification renewal was issued in August 2026, according to the commission, ahead of the regulatory rule's publication.
Westinghouse says its reactor can supply central power grids with more than 1 gigawatt of capacity, according to the design specifications published by the company. The reactor uses advanced passive safety systems, according to the company's description of its technology. The design also incorporates modular construction using prefabricated units, one of the features Westinghouse highlights for its new nuclear projects. Cameco owns a 49% stake in Westinghouse, while Brookfield owns 51%, according to Cameco's ownership disclosure. In defining the scope of the regulatory decision, the commission said the renewal "does not authorize the siting, construction or operation of a facility based on the design."
Outside the United States, Westinghouse has announced the technology's selection for nuclear power programs in Poland, Ukraine and Bulgaria. On September 23, 2026, the company announced that its consortium with Bechtel and Poland's nuclear power company had agreed on the key commercial terms of an engineering, procurement and construction contract. The agreement concerns Poland's first nuclear power plant, according to Westinghouse's project announcement. In the United States, the Associated Press reported in June 2026 that the Trump administration was providing $17.5 billion to accelerate the development of 10 new large nuclear reactors. The news agency linked the funding to rising electricity demand from data centers amid an expansion in nuclear generation capacity development.
The rule retains the previous revision of the design document alongside the updated revision, according to the regulatory document accompanying the renewal. Future applicants will be able to reference either revision in their applications, according to the commission. Westinghouse says building and operating a plant using the design in the United States requires separate site licenses, construction permits and operating licenses. The commission set November 13, 2026, as the deadline for receiving significant adverse comments on the renewal and update rule. The rule is scheduled to take effect on December 28, 2026, unless the commission receives such comments by the deadline.