The D1G designation stands for: This prototype nuclear reactor was constructed for the United States Department of Energy's Office of Naval Reactors as part of the Naval Nuclear Propulsion Program.
The containment structure — which housed both the primary (nuclear reactor) and secondary (steam plant) systems — is referred to as the "DIG-ball" due to its unique shape: a Horton sphere.
The sphere was originally constructed by Chicago Bridge and Iron Works to house the liquid metal cooled reactor of USS Seawolf, with the dome designed to contain a liquid sodium explosion.
In January 2022, a radioactive tank that was used to support the D1G reactor was transported from West Milton, New York to Wampum, Pennsylvania for disassembly.
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