Hydrogen leakage, which is frequent and with high-risk, severely threatens the operation of hydrogen cooling generator.

漏氢是氢冷发电机运行中发生频率较高且危害性很大的事件，严重影响了机组的安全运行。

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Are the rods the only danger, or are there other components, like cooling tanks or hydrogen containers, that are also dangerous with radioactive meltdown?

随着反应堆的融化是就只有燃料棒是危险的还是其它反应堆的成分例如冷却池、氢容器也是危险的？

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That was to prevent a repeat of the hydrogen explosions that blew radiation out of the plant soon after cooling systems failed in the wake of the tsunami.

海啸发生之后冷却系统失效导致了氢气爆炸，这把放射物吹出了核电站，注入氮气的行为就是为了防止这一悲剧再次发生。

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Hydrogen is building up because, due to low levels of cooling water, fuel rods are partially exposed, causing them to overheat.

BBC: Japan quake: Nitrogen pumped into nuclear reactor

That was to prevent a repeat of the hydrogen explosions that blew radiation out of the plant soon after cooling systems failed in the wake of the tsunami.

ECONOMIST: A spreading cloud of economic and human costs

Cooling problems have resulted in damage to radioactive fuel rods, hydrogen gas explosions, fires and radiation releases.

WSJ: GE Steps Up Aid in Reactor Crisis