The nuclear core in many newer reactors, including the ones in Japan, is enclosed by a steelcontainment vessel.
很多新式反应堆的堆芯，包括日本核设施使用的这些，都由钢制的反应堆安全壳密封。
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Water in the core began to boil off, raising the temperature and pressure inside the massive steelcontainment vessel.
堆芯的水开始沸腾，导致钢结构的安全壳内部的温度和压力开始升高。
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Efforts failed this week to lower a 100-ton steelcontainment dome onto the leakage site, because quickly accumulated methane hydrates blocked the device.