“NASA believes it will need 40 kilowatts of power for the first lunar inhabitants”

Sounds like it’ll only need to be a small reactor, something akin to what goes in a submarine. I’m no expert but presumably something like that is significantly quicker and easier to build than a megawatt scale nuclear reactor. The obvious challenge that the bidding companies will have to solve in the next 8 years is how to get the materials into space safely and assemble them on the moon.