Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.

一旦反应堆关闭，它仍热存在有来自其他放射性同位素踪迹的衰变热。

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Decay heat is really important.

衰变热真的很重要。

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Heat from the decay of naturally occurring radioactive elements could keep a planet warm enough for water.

放射性元素在自然衰败过程中所产生的热量能使星球上的水维持液态形式。

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Furthermore, it would take a combination of extreme events to make things dangerous in Tokyo (nuclear re-criticality, steam explosion) etc all of which are being rendered less and less likely as time passes and the heat decay process progresses.

FORBES: Fukushima Cleanup Recap

The heat from decay is lessening day by day, and the latest thermal imaging reports indicate temperatures of less than 100 degrees centigrade in reactor units 1, 2 and 3.

FORBES: Fukushima Cleanup Recap

Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.

WSJ: William Tucker: Japan Does Not Face Another Chernobyl