当反应堆停运，泵将冷却水连续通过燃料棒，水泵的电力通常是来自外部电源。
When a reactor shuts, pumps continue to move water over the fuel rods. The electricity to run the pumps usually comes from off-site power supplies brought in by transmission lines.
主循环泵转动惯量的取值是停堆初期冷却阶段的关键问题。
The running inertia of the main coolant pump is the key problem of the primary phase.
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