当处理高燃耗的乏燃料时，应采取特别措施，以避免造成溶剂的严重辐解和钚的临界问题。
Processing of spent fuel with high burn-up should take special measure in order to avoid heavy radiolytic degradation of the solvent and the criticality of plutonium.
M 5合金是一种适用于高燃耗组件的新型锆合金，主要用作燃料棒包壳、端塞、导向管和定位格架材料。
M5 alloy was a new zirconium alloy used in high burn up assembly such as fuel cladding, end plug, guide tube and grid spring and so on.
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