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When the reactor shuts down why does it require cooling?

1. To cool the reactor from chain reaction
2. To cool the reactor from fission reaction
3. Both (1) and (2)
4. None of these

Correct answer: To cool the reactor from fission reaction

Solution

When a reactor shuts down, the self-sustaining chain reaction is stopped, but the fuel still contains radioactive fission products that continue to release heat. That residual heat is why cooling is still required.

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