US Navy selects Radiant's Kaleidos microreactor for Naval Weapons Station Crane

What's the deal? The US Navy selected Radiant Industries to install its 1-megawatt Kaleidos portable nuclear microreactor at Naval Weapons Station Crane in Indiana, the service's first shore-based advanced reactor. Radiant announced the selection on 20 October 2026, about six weeks after the Department of War named Crane as the site without naming a vendor; the reactor is to be running at Crane no later than September 2028.

Why it matters: Kaleidos is a factory-built unit designed to move by truck, ship or aircraft and operate without cooling water, generating 1 MW for up to five years between refuels over a planned 20-year service life. The installation runs under the US Army's Janus Program to keep critical base infrastructure powered through grid outages — Crane hosts the Naval Surface Warfare Center division working on microelectronics, high-voltage systems and weapons. It is the second military base Radiant has secured this year after August awards of up to $2.2 billion to five reactor makers, with Radiant's share up to $750 million to deploy 15 Kaleidos units by 2030, making it the only nuclear company working with the US Army, Navy and Air Force at once.

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