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Well... Yes...

Even though a nuclear fission reactor may be shutdown and be subcritical, there are still mixed fission byproducts in the fuel which decay and generate heat. Its not the same enormous volume of heat that is used to make steam for spinning turbines and making electricity, but it is enough heat to require continuous cooling of the core for a substantial period of time.

This was the issue with Fukushima Daiichi, as well as with Three Mile Island. The reactor(s) was (were) shutdown, but the fuel still generated decay heat. When the cooling system subsequently failed, the fuel was deprived of cooling and it overheated, and it was damaged. This is also an issue with spent fuel that has been removed from the reactor and placed in the spent fuel pool. Cooling is required until the mixed fission byproducts decay enough that transport is possible.

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13y ago
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