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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