It could be coming out of a tube or the whole level in the reactor could be going down.

它能够从一个管子中出来，或者反应堆的整体水平会下降。

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Also known as the torus, this large doughnut-shaped structure sits in the centre of the reactor building at a lower level than the reactor.

这个巨大的油炸圈形(圆环形)的构筑物坐落在反应堆建筑的中心，它的标高比反应堆低。

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Control rods are used in a PWR typically to change the power level and also to shut down the reactor.

控制棒是在一个加压水冷却反应堆里使用的，用来改变能量的级别，也可以用来停止反应堆。

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For example, the Westinghouse AP 1000 reactor places cooling water at a level above the reactor unlike the Fukushima design so that it would naturally flow down.

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In one of the examples cited in the report, the Nuclear Regulatory Commission (NRC) has twice raised the acceptable level of radiation damage reactor vessels can sustain, after several plants violated or came close to violating the original standard.

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Tepco had been pumping water to raise the level in the No. 2 reactor.

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