There's a problem with nuclear power on the Moon. How do you get rid of the heat? Here on Earth, we just use water, of which we have plenty. But on Moon water is extremely scarce. It would make the sci-fi novel Dune look like an oasis. When we'll have some type of an economy on the Moon, it's very likely that water will be more expensive than gold. One thing is absolutely certain: we will not be able to afford to vaporize water and let the steam vent. So, any nuclear reactor on the Moon will need to have some complex array of pipes where steam is circulated through some radiators, then condensed and recirculated. Or, who knows, maybe we'll do this cooling with liquid metals. Among the more abundant metals on the Moon, tin could be a good candidate; there was an experimental reactor at the Oak Ridge National Lab in the 60's that used liquid tin as a coolant.