核燃料的形式是在硬合金包裹下的燃料棒；并且这些燃料棒放在水中，外面还有一层钢压力容器。
The nuclear fuel is encased in hard alloys to construct fuel rods; the reactor core that these rods make up, and the water it sits in, are contained within a steel pressure vessel.
由于锆4合金具有低的中子吸收截面，良好的抗腐蚀能力、高强度以及延展性好的特点，被广泛用于压水堆作为核燃料棒的包壳材料。
Zircaloy - 4 is generally used as fuel tubes in pressurized water reactors because of it " s low neutron absorption cross - section, excellent corrosion resistance, good strength and ductility".
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