Thorium SMR is nearly ideal for this (Score 2)

Build a molten salt Thorium fueled reactor with a thermoelectric (similar to Peltier junction) exchanger. Send it to the moon unfueled. Process lunar soil to extract Thorium which is *abundant* and fuel it on-site. They are inherently safe, cooling is not the same class of issue as it would be with a Brayton (steam) cycle Uranium reactor like the ones in use in the US today, the high heat output is useful as process heat for other operations a lunar base would require, and megawatt-scale SMRs the size of semi trailers are already on the drawing board. There's a useful primer here: https://juniperpublishers.com/...