Radiant NuclearIn Development
A 1 MWe portable high-temperature gas-cooled microreactor using TRISO fuel, helium coolant, and prismatic graphite blocks with zirconium-hydride moderator, packaged in a single shipping container with power conversion and air cooling. Designed to be trucked, shipped, or flown to a prepared pad, reach full power the next day, run five years before factory refueling, and last 20 years (four cores). No on-site water and no on-site spent-fuel storage.
Latest update Sep 18, 2026
01
First commercial deliveries are targeted for 2028 (Buckley Space Force Base under ANPI). Equinix has ordered 20 units with deposits. The Army Janus award covers 15 units through 2030. The design is in NRC pre-application (docket 99902106); no commercial operating license has been issued.
02
03
Announced next steps from Radiant Nuclear that mention Kaleidos.
Q3 2026
Q4 2026
Radiant's regulatory engagement plan says it will submit an operating-license application for Kaleidos at R-50 in Q4 2026, separate from the Part 70 materials license now under review. NRC pre-application (docket 99902106) has been open since October 2022. As of September 18, 2026 no operating-license application was on file.
2028
ANPI selection on April 22, 2026 names Buckley SFB in Aurora, Colorado as the proposed site, with first Kaleidos reactors targeted for 2028. Siting and NEPA analysis have not finished. Radiant frames this as America's first commercially developed microreactor at a military installation.
2030
The August 26, 2026 Janus agreement is for 15 Kaleidos units totaling up to $750M, with Fort Benning named and deployments framed through 2030. Payments are milestone-based. The actual pad location at Benning is still to-be-determined.
04
Radiant said on October 29, 2026 that the Department of Energy approved the Documented Safety Analysis for its Kaleidos microreactor, covering operation at power as well as initial criticality. The company said a Readiness Review still has to be completed before fueling and a five-phase test at Idaho National Laboratory, which it describes as 60 effective full-power days and at least 150 hours of continuous full-power operation without an operator. The release does not say the reactor has been fueled or taken critical, and no separate DOE approval document was opened.
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