“燃料失效”是个更贴切的词汇来描述燃料棒这层屏障的失效(锆锡合金)。
"Fuel failure" is a better term to describe the failure of the fuel rod barrier (Zircaloy).
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。
Reactor operators calculate how long it would take, once cooling is lost, for the spent fuel to boil the water it sits in.
同时对于2号反应堆，官方指出完全失效的冷却系统引起水位下降，使得燃料棒完全暴露在水面之外。
And at the Number 2 reactor, officials have indicated a complete failure of the cooling system caused the water level to fall, leaving the fuel rods fully exposed.
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