These are the three recycling pumps which supply water to reactor cooling system.

这是三个循环泵的供水水反应堆冷却系统。

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The reactor cooling system re-circulates water, so its return would simplify recovery operations.

反应堆的冷却系统将水不断进行循环，冷却系统恢复后可以简化复原工作。

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So that is the emergency core cooling system for a pressurised water reactor.

所以，那是紧急核心冷却系统，对于一个加压水反应堆而言。

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Hours earlier, the plant operator switched off a reactor cooling system after discovering rats near critical equipment.

BBC: IAEA calls for improvements at Japan's Fukushima plant

Even before the reported explosion, officials were becoming increasingly worried about No. 2 reactor, due to a problem in the cooling system that hasn't occurred in the others.

WSJ: Japan's Nuclear Crisis Escalates

On site, the workers in its number one reactor appear not to have been familiar with an emergency-cooling system called an isolation condenser, which they wrongly thought was still working after the tsunami.

ECONOMIST: Banyan