Deep Fission, the nuclear energy company placing small modular pressurised water reactors in boreholes one mile underground, has selected the Great Plains Industrial Park in Kansas as the site of its advanced reactor pilot project.

The California-headquartered company, founded in 2023, said it will hold a groundbreaking ceremony on 9 December, marking a significant milestone in its first demonstration of the Gravity nuclear plant.

Deep Fission plans to deploy 15-MW pressurised water reactors one mile underground via 30-inch boreholes. Its reactor was previously referred to as the Deep Fission Borehole Reactor-1, or DFBR-1, but was recently renamed by the company to the Gravity Nuclear Reactor, or simply Gravity.