The pools, which sit atop the reactor buildings and are meant to keep spent fuel submerged in water, have lost their cooling systems.

乏燃料池位于反应堆建筑的顶部，它们本应浸泡在冷却水中，但是它们的冷却系统已经损坏。

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When auxiliary batteries were exhausted, the plant was without power to continue cooling reactor cores and spent fuel pools.

一旦辅助电池用尽，核电站将无法继续冷却反应堆内核以及乏燃料池。

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Reactor operators calculate how long it would take, once cooling is lost, for the spent fuel to boil the water it sits in.

反应堆操作员计算过燃料池使输入的冷却水沸腾（即冷却失效）需多少时间。

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As many as 15 percent of the 5, 000 previously approved welds in the reactor's auxiliary plumbing, containment dome and spent-fuel cooling systems were X-rayed and found to be defective due to air pockets, poor soldiering and heat damage.

CENTERFORSECURITYPOLICY: A Chernobyl reminder just off our shores

The power cut last month shut down cooling systems for four spent fuel ponds at reactors 1, 3 and 4, although cooling for the reactors themselves was not affected.

BBC: Fukushima nuclear plant: Cooling system power restored

The power cut shut down cooling systems for four spent fuel ponds at reactors 1, 3 and 4 on Monday evening, although cooling to the reactors themselves was not affected.

BBC: Fukushima: Rat linked to outage at Japan nuclear plant