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Company

Radiant

www.radiantnuclear.com

Developer of Kaleidos, a microreactor of about 1 MWe sized to fit in a single shipping container, selected for US military sites.

Track Radiant
HQ
El Segundo, California, USA
Status
Private

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Key facts

DOE safety analysis approval (company-stated, Oct 2026)

Said Oct 29 2026 that DOE approved its Documented Safety Analysis for Kaleidos, covering operation at power as well as first criticality. DOE's Readiness Review comes next.

Kaleidos test plan (company-stated)

Five-phase campaign at INL's DOME test bed: 60 effective full-power days over several months, ending with at least 150 hours at full power without operator intervention.

Kaleidos reactor (reported)

Helium-cooled, TRISO-fueled high-temperature gas microreactor rated about 1 MWe (3 MWth), sized to fit in a single shipping container. The test unit left El Segundo, California, in Aug 2026.

Navy site selection (reported)

Selected by the U.S. Navy to deploy Kaleidos at Naval Weapons Station Crane in Indiana.

Data & sources

Government records

1

Web sources

3

4 sources backing this record.View all →

Safety record

No incidents on record for Radiant.

Only active incidents are counted. Retracted incidents are excluded from this summary but remain reachable at their canonical URLs.

Full safety record: incidents, sourcing, and exposure data →

Mentioned on (2)

Registry pages whose text names Radiant.