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Yes - it's called decay heat, but if you damage your control rods, which is likely by pumping uninhibited seawater into the reactor, then you can very qucikly start an atomic chain reaction again, and head back towards criticality.... you are still releasing free neautrons - your control rods are absorbing these, combined with the coolant water... BOTH are critical to control of the reaction.... lose the water and the control rods are much less effective....
The risk in the fuel ponds where they are storing fuel rods whilst the decomissioned reactors are being maintained, is that you begin to initiate a reaction there. That can be initiated by a temp spike too (all reactions are slower at low temperatures etc... basic chemistry / physics.
Source: im an engineer....
9/11/01 (date of 9/11) + 3/10/11(date of tusnami) = 12/21/12 (so called "end of world")
ahhhh shit