在那次事故中，有一半核反应堆芯在事故发生后的两小时内便融化了，直到工作人员将误关的应急冷却系统开关重新打开，反应堆芯才停止了融化。
There, half the reactor core melted in the first two hours of the accident. The melting stopped when an operator turned on emergency cooling, which had mistakenly been turned off.
应急堆芯冷却系统是核电站工程安全设施的一个组成部分。
The emergency core cooling system is a component part of engineered safety feature of a nuclear power plant.
除了上充功能，应急堆芯冷却系统运行时，离心上充泵用作高压安注的一部分。
In addition to the charging function, the centrifugal pumps also serve as the high head safety injection pumps during emergency core cooling system operation.
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