Another small nuclear reactor has achieved “criticality,” marking the fifth new reactor type to be certified as operationally viable in the United States since June, after none were certified for more than a half-century, as the nation’s “nuclear renaissance” quickly advances to commercial mass-production.
Santa Clara, California-based Oklo’s Groves Isotope Test Reactor reached criticality on Aug. 5 at the company’s plant in Lockhart, Texas, and will produce isotopes for medicine, advanced manufacturing, scientific research, space exploration, and national security needs.
Unlike massive cement-siloed, utility-scale reactors such as the Westinghouse AP1000, the Groves reactor is a circular 22.5-foot-diameter nuclear generator that can be shipped by truck or rail and planted in a 35-foot-deep reinforced concrete cavity, making it a distinct entry in an expanding range of small, portable reactors on the cusp of being retail ready.
As John Haughey details for The Epoch Times, Oklo is one of 10 companies selected by the Department of Energy (DOE) in August 2025 to develop 11 “first mover” innovations under a reactor pilot program authorized by President Donald Trump in four May 2025 “Nuclear Renaissance” executive orders that call for licensing 10 new reactors by 2030 and quadrupling the nation’s nuclear energy capacity by 2050.
The president’s executive orders included incentives for three prototypes to reach “criticality”
