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摘要

A method of treating a sheathing tube or fuel channel of a spent fuel box of a fuel assembly of a nuclear reactor comprises containing and reducing the volume of the sheathing tube prior to its disposal. The sheathing tube, after separation from a bottom piece of the fuel box, is placed in a protective tube. The protective tube and sheathing tube contained therein are then flattened and shaped into a convoluted form. Typically the flattening and shaping are performed in a single operation in a rolling mill, the protective tube and sheathing tube being rolled into a coil.