I suppose the regolith itself could be used as a heat sink. I don’t know what its thermal properties are like?
But yeah, I imagine heat dissipation is a limiting factor. Everything I’ve read suggests the 1st gen reactors will put out something on the order of 10s of kilowatts, so rather modest by nuclear standards but still plenty for a nascent Moon base I imagine?
Right now, it is southwestern-style Indian upma with eggs and salsa. My wife invented that after randomly picking up a package of instant upma from a nearby Indian grocery and noting that it reminded her a bit of grits. We are afraid to tell anyone of south Asian background of this no doubt sacrilegious interpretation.