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Talk about where that term comes from. if the uranium melting down in a spent fuel pool or reactor is allowed to melt down completely and become one giant molten mass, tepco admitted this week that it is possible that nuclear fission could start again. they call that criticality. if that happened, there would be an explosion. and after all the efforts to prevent the worst from happening by trying to get water onto these fuel rods, in the event of a full meltdown if all the uranium became one molten pile of muck, then putting it in contact with water would all of a sudden become not a good idea...

Recriticality would generate an explosion big enough to really spew this radioactive gunk very far. this is not necessarily going to happen. but the risk is, if the meltdown is uncontrolled, that this could happen. and this is an important point about this. what i just described is not the same as a nuclear explosion. it is not this. it would not be a nuclear bomb. it would not be a mushroom cloud. but it could be a large explosion that spread nuclear material. do you remember after 9/11 when we all learned the difference between a nuclear bomb and a dirty bomb? sort of the same distinction. o...

Of muck, then putting it in contact with water would all of a sudden become not a good idea but a very bad idea. it would make a recriticality more possible, adding water to a molten critical mass of uranium like that. and that would -- a recriticality would generate an explosion big enough to really spew this radioactive gunk very far. this is not necessarily going to happen. but the risk is, if the meltdown is uncontrolled, that this could happen. and this is an important point about this. what i just described is not the same as a nuclear explosion. it is not this. it would not be a nuclear...