> Cost is not only relevant, it's paramount. Efficiency is only important insofar as it affects overall cost.

Oh sorry, I thought you were talking about efficiency. Ok, what is the cost is for these plants?

> A single full time employee, like a security guard, will cost a good chunk of that.

I dunno, a 1MW nuclear plant could end up being pretty small. It might easily be economic to install them places that already have security guards.

Microreactors have been tried before by the military, for use at bases, which have guards. They not only didn't make sense to install, they didn't make sense to continue to operate once installed.