Property control technique of the mixed oxide fuel pellet by the addition method of M3O8 scrap powder and the sintering process

摘要

PURPOSE: A method for adding M3O8 scrap powders and a method for controlling a characteristic of a mixed nuclear fuel pellet by a sintering process are provided to recycle scrap powders in a mixed nuclear fuel fabrication process by mixing M3O8 scrap powders with powders of raw materials. CONSTITUTION: M3O8 scrap powders of 5, 10, 12.5, 15, and 30 weight percents are mixed with powders of raw materials, respectively. The M3O8 scrap powders and the powders of raw materials are mixed by using a turbula mixer. A milling process for the mixture is performed. A lump of powders having a circular shape is formed by adding the M3O8 powders to the mixed powders. A sintering process for the lump of powders having the circular shape is performed under atmosphere of hydrogen 7 percent and nitrogen of 93 percent at temperature of 1650 to 1750 degrees centigrade.