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# Last Energy, Radiant and Antares clear DOE safety steps
- URL: https://atomicinsider.com/news/last-energy-radiant-and-antares-clear-doe-safety-steps/
- Published: 2026-11-02T14:15:00.000Z
- Updated: 2026-11-04T08:39:44.000Z
- Description: Three companies in the Reactor Pilot Program passed Department of Energy authorization milestones in October.
- Author: Oleg
- Tags: News

The Department of Energy approved the documented safety analysis for Last Energy’s pilot reactor at Texas A&M’s RELLIS campus on 7 October. The pilot shares the geometry of the 20 MWe PWR-20 and is meant to show low-power criticality first.

Radiant’s safety analysis for its Kaleidos demonstration unit was approved on 29 October. The 1 MWe helium-cooled microreactor will run at full power for 60 days at Idaho National Laboratory.

Antares’ nuclear safety design agreement for Mark-1, its first electricity-producing reactor, was approved on 23 October. The company plans six months of full-power operation in 2027.

*Source:* [*Nuclear Newswire (ANS)*](https://www.ans.org/news/2026-11-02/article-8549/antares-last-energy-and-radiant-hit-doe-authorization-milestones/?ref=atomicinsider.com)