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Department of Energy Celebrates First Advanced Reactor Criticality

Department of Energy Celebrates First Advanced Reactor Criticality

@ENERGY
ENGLISH21 hours ago · Jun 04, 2026

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The DOE and Antares Nuclear have successfully achieved criticality with the Mark-0 advanced reactor, marking the first privately developed non-light-water reactor to reach this stage in the U.S. in over 40 years.

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