We know of no core damage at any of the reactors.

我们尚未发现任何反应堆有融毁现象。

I'm asking him specifically about the core damage at reactor three.

我的问题是针对三号反应堆堆芯融毁。

The principal lessons learned from Fukushima was, one, that an extended loss of A.C. power, electricity, can lead to core damage.

从福岛事故中吸取的主要教训是，其一，长时间失去交流电会导致堆芯损坏。