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the reason they use water is just to kool the fuel. the fission reaction produces massive amounts of energy and heat. after the fission reaction terminates, the FP produce enough heat to melt steel...

These reactor, nor any in the US use graphite in the reactor. some older models in russia still have the old graphite reactors. here is pic of the type of reactor japan has. it's called a boiling...

I should of added a referance for dose. I am more comfortable using the rad and rem terms which is the US system, the Gy and Sv are SI (System International) system. For general purposes 1 rad = 1...

Steve with all due respect, your scenario is somewhat flawed. Radiation is not short lived in the way you put it. Radiation is the energy coming from radioactive elements, the general term is...