Radiant Selected by Department of Energy as First New Nuclear Reactor Design to Be Tested in DOME

Reactor installation and testing scheduled to begin in Spring 2026

July 2, 2025

July 2, 2025 — Radiant, the company on the forefront of pioneering the world’s first portable mass-produced nuclear microreactor, announced today that it has been conditionally selected by the U.S. Department of Energy (DOE) to conduct the first test of its Kaleidos microreactor in the National Reactor Innovation Center’s Demonstration of Microreactor Experiments (DOME) test bed at the Idaho National Laboratory (INL). The demonstration reactor installation and testing is scheduled to begin in Spring 2026 and would be the first new U.S. nuclear reactor design to be tested in DOME.

The DOME facility is being established at INL to accelerate deployment of advanced microreactor technologies. Radiant was competitively selected and is currently working through the multi-phase DOE authorization process to support the design, fabrication, construction, and testing of each fueled reactor experiment.

Radiant’s Kaleidos reactor is designed to be built on an assembly line and deliver more than 1 MW of electricity in a portable package. Fueled by TRISO fuel particles, Kaleidos is designed for deployment anywhere it’s needed without the need to refuel for years.

This latest news comes on the heels of Radiant’s previous conditional selection by DOE to receive an allocation of high-assay low-enriched uranium (HALEU) fuel for the Kaleidos test — a critical enabler of next year’s demonstration.

For more information on Radiant and the Kaleidos microreactor, visit www.radiantnuclear.com.