noun
decay heat
Technical term in nuclear physics: heat produced by the radioactive decay of fission products in a nuclear reactor after shutdown.
原子炉を停止した後も、崩壊熱の除去が必要である。
Even after the reactor is shut down, removal of decay heat is necessary.
Compound of 崩壊 (collapse, decay) and 熱 (heat), directly corresponding to the English term 'decay heat'.