youdao

That's due to the heat that remains in the nuclear core, both from the recently-disabled but still-hot fuel rods and from the various byproducts of the fission process.

燃料棒虽然停止工作，但仍然非常炙热，而且裂变反应生成的多种副产物也会产生很多热量，这些热量一直维持在反应堆的核心。

youdao

Nuclear power is produced by harnessing the heat produced by the splitting of atoms inside uranium - a process known as fission.

核能是由原子内的铀发生链式反应而释放的能量——这个过程叫做裂变。

youdao

Modular nuclear reactors take uranium, or in some cases thorium, and produce steam for turbines via heat generated in fission reactions.

FORBES: Mini-Nukes Back From Grave As Fluor Invests In NuScale Power

Thermoelectric coupling uses heat from the decay of a radioactive fuel (as opposed to the full-scale nuclear fission which powers a reactor on Earth) as its energy source.

ECONOMIST: A more efficient way to make electricity in spacecraft