eVinci test reaches criticality at 663°C and peak core temperature of 1,011°C, turning physics into evidence and accelerating the pathway to microreactor commercialization

Cranberry Township, PA, September 15, 2026 – Westinghouse Electric Company has successfully completed zero-power high-temperature criticality testing for its eVinci™ microreactor, a defining milestone in the program’s build-test-learn development journey. The work was completed in partnership with Los Alamos National Laboratory and the Nevada National Security Site (NNSS) at the National Criticality Experiments Research Center (NCERC), a National Nuclear Security Administration (NNSA) capability in Nevada.

Program accelerates deployment of advanced nuclear energy for national security

Cranberry Township, PA, August 26, 2026 – Westinghouse Government Services (WGS) announces that the eVinci™ microreactor has been selected by the U.S. Department of the Army for the next phase of the Janus Program.

Achievement validates key design assumptions and advances Westinghouse's strategy for microreactor technology

Cranberry Township, PA, August 25, 2026 – Westinghouse Electric Company has successfully completed zero-power criticality testing for its eVinci™ microreactor, which validated the models and core design assumptions of the technology. The test was completed in partnership with Los Alamos and Idaho National Laboratories at the National Criticality Experiments Research Center (NCERC), a National Nuclear Security Administration (NNSA) facility at the Nevada National Security Site (NNSS), on August 24, 2026 at 10:39 a.m. PT.

April 6, 2026 – Westinghouse Electric Company has submitted Revision 20 of the AP1000® Design Control Document (DCD) to the U.S. Nuclear Regulatory Commission (NRC), which establishes Plant Vogtle Unit 4 as the standard AP1000 reference plant for U.S. deployment.