Before the tsunami hit, the cooling system was operated by diesel generators in the plant [to compensate for] a loss of external power sources after the earthquake.
在海啸到来之前，核电站里的冷却系统是由柴油发电机发动的，[为了补偿]地震后外部能源的缺损。
2
Such a system requires power to pump the coolant, but can be operated indefinitely.
这种制度要求的权力，泵冷却剂，但可以经营下去。
3
According to an initial investigation, a sudden loss of power caused the signal system to fail, forcing the trains to be operated manually, Shanghai Shentong Metro Group Company said in a statement.