But do we need unattended reactors for the moon? Adding a "nuclear reactor tech" person to the mission control room in Houston sounds cheap compared to R&D costs, latency to the moon is small, and for any hands-on tasks you can presumably train the astronauts (or train a couple experts as astronauts if you want to vindicate the plot of Armageddon). After all, just like a submarine a moon base would be staffed by trained specialists.