Antares Nuclear Inc.’s Mark-0—a sodium heat-pipe-cooled microreactor fueled by high-assay low-enriched uranium (HALEU) tri-structural isotropic (TRISO) fuel compacts—has achieved zero-power ...

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WASHINGTON — Antares Nuclear completed a zero-power criticality test for its Mark-0 demonstrator reactor at Idaho National Laboratory on June 4, 2026. This milestone advances the deployment of ...