What are they using to keep the core cool?
Ambient climate chilly on the moon
Most modern reactor designs are such that they are air cooled and/or run at much lower temperatures (thorium). I realize that there is little air on the moon, but if the reactor is on the dark side, temps can plummet pretty low. Also, I’d imagine the purpose is to mine the water they’ve discovered, and split the bond, using electricity, to create hydrogen for fuel. The oxygen from that process can be pretty useful, I’d think.
Some nukes use liquid Sodium as coolant.
What are they using to keep the core cool?
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Lets see, in the right place on the moon the temperature might be a constant MINUS 280 to 396 F. Cool enough for you?