Advanced Reactors

US DOE Approves Nuclear Safety Design Agreement For Underground Reactor

By David Dalton
10 August 2026

Major milestone means Gravity plant warrants advancement, says Deep Fission

US DOE Approves Nuclear Safety Design Agreement For Underground Reactor
Deep Fission plans to deploy 15-MW pressurised water reactors one mile underground. Courtesy Deep Fission.
Deep Fission, a US advanced nuclear energy company developing small modular reactors installed one mile underground, announced that the US Department of Energy (DOE), has approved the company’s nuclear safety design agreement (NSDA) for its Gravity nuclear reactor.

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