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The effect of a CAM (Continuous Attrition Mill) treatment on the sinterability of ex-ADU UO2 powder was investigated. As the cycles of a CAM increased, the apparent density, specific surface area and O/U of the milled powder increased, but there particle sizes decreased. However the sintered density of the UO2 pellet decreased as the cycles of the CAM increased. It is considered that the decrease of the sintered density is due to the formation of U3O8, which was produced by a CAM mechanism.