Due to deep burn-up, the spent fuel of nuclear power reactors has not only complex composition, but also high-level radioactivity.

动力堆乏燃料由于其燃耗深，所以成分复杂，放射性强，从而给其后处理分析带来极大的困难。

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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.

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。

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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.

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。

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Nuclear engineers have long known of increased risks from high burn-up fuels, but scientists at Argonne have been sounding the alarm about storage dangers in recent years after their research ( pdf) showed high burn-up fuels may result in fuel rods becoming more brittle over time.

FORBES: Fancy New Lids for Nuclear Waste Casks, As Contents Get Hotter