platonium. the light water reactor is much simpler but produces more waste. it was chosen by rick over to be the reactor for the submarine. there are many things to be said for light water reactors and there is something to be said against them. but with rick over's influence, the light water reactor became a principle reactor around the world. >> we developed water reactors but we looked at that as a near term short raised stepping stone to real new clear power, the breeder reactor. that's what we consider to be the most likely real long range for nuclear power. but the water reactor that is marketed at first.