February 9, 2026

Radiant Advances to Final DOE Authorization Phase for Kaleidos Reactor ()

Radiant has received DOE approval of its Preliminary Documented Safety Analysis for the Kaleidos reactor, marking the first full-power test approved under the DOE’s new authorization pathway and paving the way for final startup authorization at INL’s DOME facility...

April 26, 2025

Radiant Selected by DOE to receive HALEU Fuel for Reactor Test ()

Radiant, a Nucleation portfolio company working to mass produce portable nuclear microreactors, was selected by the Department of Energy to receive an allocation of HALEU fuel for its first test of Kaleidos, the group’s reactor design.

December 30, 2021

Radiant Nuclear

Radiant Nuclear – An El Segundo, California-based developer of Kaleidos, a mobile high-temperature gas nuclear microreactor that replaces diesel generators.

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