如果温度高到一定程度，堆心就会落到反应堆容器的底部并将其熔穿，从而到达密封装置的底部。
If the temperature is high enough, the core slumps to the bottom of the reactor vessel and melts through it and onto the floor of the containment unit.
高放射性废料是最危险的，因为它能熔穿容器，而且放射性强到在它旁边的人只需几天就有致命危险。
High-level waste is the most dangerous because it can melt through containers and is so radioactive it would be fatal if someone was near it for a few days.
同时在铸造过程中，必须采取措施解决镶铸管因受热膨胀而产生弯曲变形、被液态金属熔穿和减少铸件的热应力等问题。
Meantime, in the course of casting, we shall take measures to solve the problems such as the bending and deformation due to the heating expansion of embedded steel pipes...
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