A California-based developer of microreactors has completed a critical passive cooldown demonstration of its prototype Kaleidos system.
Developed by Radiant Industries, the Kaleidos microreactor is one of the designs that are on track to be part of a historic test at Idaho National Laboratory (INL) in the world’s first microreactor test bed as early as mid-2026.
The completion of its front-end engineering and experiment design (FEEED) phase at the INL is a major step to bringing the world’s first factory-constructed microreactors to market.
The demonstration of the passive cooldown system, which took place on September 17th, showcases the reactor’s ability to safely shut down and cool off without power. The recent test highlighted the reactor’s suitability for deployment even in populated urban areas.
Radiant claims that the reactor safety system triggers a shutdown within 300 milliseconds of detecting an emergency condition.
The company remains on schedule to conduct a full test of the Kaleidos microreactor at the Idaho National Laboratory in 2026. This would make it the first new reactor design to be operated in 50 years.
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