Antares' Mark 0 reactor reaches criticality, not power generation

The Idaho National Laboratory test validates a self-sustaining chain reaction while Antares still faces power conversion and licensing work.

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Primary source: Ars Technica

Why it matters

Antares has crossed a physics threshold that investors and government customers can understand, but the harder proof is still ahead: generating power and building a licensable system.

Illustration of Antares' Mark 0 reactor at Idaho National Laboratory reaching criticality during testing, with the reactor core and monitoring instruments visible.

Antares announced Thursday that its Mark 0 test reactor at Idaho National Laboratory reached criticality, according to Ars Technica, making the nuclear startup the first new small-reactor design to hit that threshold under Washington's accelerated nuclear push.…

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