Friday - June 19, 2026
Department of Energy Celebrates Second Advanced Reactor Achieving Criticality
June 19, 2026
WASHINGTON, June 19 -- The U.S. Department of Energy's Office of Nuclear Energy issued the following news release on June 18, 2026:

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Department of Energy Celebrates Second Advanced Reactor Achieving Criticality

The U.S. Department of Energy (DOE) today celebrated another historic milestone in America's nuclear renaissance. DOE Reactor Pilot Program participant Valar Atomics' advanced reactor design, Ward 250, successfully completed a zer . . .

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