Antares Clears First DOE Authorization Gate for Mark-1, Its Electricity-Producing Reactor

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Antares Clears First DOE Authorization Gate for Mark-1, Its Electricity-Producing Reactor

https://www.businesswire.com/news/home/20261023509758/en/Antares-Clears-First-DOE-Authorization-Gate-for-Mark-1-Its-Electricity-Producing-Reactor

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The United States Department of Energy approved the Nuclear Safety Design Agreement for the Mark-1 microreactor project. The authorization allows Antares to proceed toward generating electricity at the Idaho National Laboratory in 2027. Data from this upcoming test campaign will support subsequent commercial deployments and defense applications, including installations scheduled for 2028 under the Army Janus program.

Antares today announced that the U.S. Department of Energy (DOE) has approved the Nuclear Safety Design Agreement (NSDA) for Mark-1, the company's first elec...

Antares Clears First DOE Authorization Gate for Mark-1, Its Electricity-Producing Reactor

Nuclear Safety Design Agreement approval comes four months after Mark-0 criticality; Antares on track to generate electricity at Idaho National Laboratory in 2027

Mark-1 is designed to operate at full electrical power for several months in 2027 at Idaho National Laboratory, integrated with Antares' nitrogen closed Brayton cycle power conversion system. It uses the same full-scale core, TRISO fuel, and test facility as Mark-0, which achieved criticality on June 4, 2026, as the first privately developed non-light-water reactor to do so in the United States in more than four decades.

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https://www.businesswire.com/news/home/20261023509758/en/Antares-Clears-First-DOE-Authorization-Gate-for-Mark-1-Its-Electricity-Producing-Reactor