Earthquake damage
地震时

The earthquake initiated a rapid shutdown of the reactors, but the disaster cut power to controls and pumps, and the tsunami disabled backup generators. New diesel generators were delivered after batteries used to control the operation of the reactor were exhausted.
周五的地震切断了各种控制系统和水泵的电力供应，而海啸又使备用发电机组无法工作。在控制反应堆运作的电池报废后，不得不启用第二套柴油发电机。

Since the quake hit, fuel rods in the cores of reactor 1, 2 and 3 have overheated because of a lack of cooling water.
自地震以来，由于冷却用水的缺少，1、2、3号反应堆核心中的燃料棒一直处于过热状态。

Control rods were inserted into the cores to stop fission, but cores need several days to cool down.
控制棒已经插入，但是核心需要好几天时间来冷却。