I'm pro-nuclear for certain...but the complexeties and potential hazards really lend themselves to economy-of-scale. Large centralized operations are more cost effecient in most situations anyway.

The biggest problem I see is the potential for such a unit to provide the raw materials for a dirty-bomb...it's not going to be economically feasible to provide the kind of 24/7 security found at large commercial plants. And that security is not TSA-caliber, it's mostly ex-SOF guys armed with military grade weapons, including heavy weapons.

Also I'm a big fan of centralized waste storage..the idea of abandoning such units in-place is ludicrously irresponsible. Also refueling operations are NOT trivial, and you would not want to conduct such operations in the immediate vicinty of a population center. Also, the spent core which is extracted during refueling would be ideal dirty-bomb material, and would be much easier to steal it in-transit than it would be to break into an operating unit.

Reactor cores, operational and spent, need to be maintained and secured as centrally as possible.