Antares Reactor Achieves Criticality at Idaho Lab

Antares Reactor Achieves Criticality at Idaho Lab

Science

Antares Nuclear Inc. achieved criticality with its small nuclear test reactor at the Idaho National Laboratory, according to the Energy Department. This milestone represents a significant step in the development of small modular reactors, which could enable electricity production in the future.

Although the reactor has reached criticality, it is not yet capable of generating power. The achievement was reported by AP News and later detailed by Ars Technica, highlighting Antares' progress in advanced reactor design at the Idaho facility.

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June 05, 2026
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Antares Achieves Criticality with Advanced Reactor Design
Antares Achieves Criticality with Advanced Reactor Design

Ars Technica • 05 Jun 19:23

Antares has successfully achieved criticality with its test reactor at the Idaho National Laboratory, marking a milestone in small modular reactor development, although it is not yet capable of generating power.

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Small Nuclear Reactor Reaches Critical Milestone at Idaho Lab
Small Nuclear Reactor Reaches Critical Milestone at Idaho Lab

AP News • 05 Jun 18:59

The Energy Department announced that a small nuclear reactor, developed by Antares Nuclear Inc. at the Idaho National Lab, has achieved a critical milestone, enabling potential electricity production in the coming years.

Credibility 85% Manip. 25% Center

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