A mini nuclear power plant makes no economic sense. It will never happen. What MIGHT make sense is what I suggested earlier in this thread Mini nuclear plants
. A re-use of existing power plant spent fuel rods for district heating plants. In no way is this a nuclear power plant, with liquid sodium pumping flow paths, massive cooling towers, etc. It would be something like the water pools now used to house the spent fuel rods at existing nuclear power plants. Those water pools are hot and will remain thermally hot for a long, long time. That thermal energy is now being wasted. By safely capturing that energy and distributing to residential or commercial customers you would in a sense have "free" heat. Free heat that does not generate CO2, a environmentally desirable process. For sure it could not really be free because there would be security issues in insuring that the spent fuel rods do not get into the wrong hands, but that issue is already solved at existing nuclear power plants. District heating in common in European cities and some old US cities. Spent fuel rods have enough energy left to make hot water but not enough left to make steam, that's why they are "spent".
What's needed is the political will to make this happen. It would be one step on the road to energy independence. Is it possible to do safely? I don't know, but right now it's not even being suggested.