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Deep Fission delivers prototype canister for underground small reactor

The delivered canister in Kansas follows completed fabrication and hydrostatic testing, as the company moves to non-nuclear tests ahead of large-diameter drilling.

Reported · Written up by our desk · Energy Transition

Deep Fission says a prototype reactor canister has arrived at its Kansas installation site, advancing a proof of concept for an underground small modular reactor design. The California-based startup plans to test a modular reactor placed roughly a mile underground, covered by pressurized water, to support cooling and help maintain operating pressure.

According to OilPrice, Deep Fission framed the approach as a way to make nuclear power cheaper and safer while expanding round-the-clock, carbon-free energy options. The design, described as a gravity reactor concept, is intended to reduce reliance on external cooling and avoid large, expensive surface pressure vessels used in standard nuclear plants.

OilPrice also reported that the prototype has completed fabrication and hydrostatic testing, and that Deep Fission will begin a next phase of non-nuclear testing as it prepares for large-diameter drilling at the Kansas site. The surrounding bedrock is also expected to contribute additional safety characteristics for the underground system.

Deep Fission Chief Nuclear Officer Mark Pérès said the arrival of the canister represents a step from design toward deployed infrastructure, as the company continues toward subsequent testing at the site.

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