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There's no place like DOME 🏠

Department of Energy's Office of Nuclear Energy sent this bulletin at 04/09/2026 11:11 AM EDT

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April 9, 2026

World’s First Microreactor Test Bed Now Open for Business

Photo of the DOME microreactor test bed, a silver dome-shaped building against a blue sky.

Photo: INL

Construction of the National Reactor Innovation Center’s Demonstration of Microreactor Experiments (DOME) test bed is now complete.

Located at Idaho National Laboratory, the first-of-its-kind facility will enable the rapid development, testing and demonstration of privately developed advanced nuclear reactors.

DOME is an actual dome,100 feet tall and 80 feet in diameter. The space provides a safe environment to test experimental reactor concepts and gather performance data that can be used to inform future commercial licensing applications.

Reactor developer Radiant has started their scheduled year-long test campaign of the Kaleidos Demonstration Unit. Staging will begin later this spring with initial startup of the reactor anticipated in the summer.

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