From the point of view of safety smaller reactors that -can't- go into critical mass by the design are far superior to the older huge reactor designs that we have currently. Sure it's usually cheaper to go bigger but the public just is not going to have allow it with designs that can potentially go critical mass and make the next Chernobyl no matter how many times you tell them you can handle any situation.
You know exactly what I was talking about. Sorry I'm not a nuclear scientist. In common parlance "going critical" means losing control of the reaction and having to run away at a fast rate of speed before you become a victim of radiation poisoning.
