Fabrication method of burnable absorber nuclear fuel pellet using rapid sintering, and the burnable absorber nuclear fuel pellet thereby

摘要

The present invention relates to a manufacturing method of a combustible absorber nuclear fuel pellet through rapid sintering and a combustible absorber nuclear fuel pellet manufactured by the same. More specifically, the manufacturing method of a combustible absorber nuclear fuel pellet includes: a step (step 1) of adding and mixing a boron compound to one or more kinds of nuclear fuel powder selected from a group including uranium dioxide (UO2), plutonium dioxide (PuO2), and thorium dioxide (ThO2); a step (step 2) of molding the mixture powder mixed in the step 1 to manufacture a molding; a step (step 3) of inserting the molding manufactured in the step 2 into a heating furnace and raising the temperature of the heating furnace at a temperature raising speed of 15 - 60 C/minute under a hydrogen atmosphere; and a step (step 4) of sintering the molding inserted into the heating furnace in the step 3. According to the present invention, by rapidly raising the temperature to a sintering temperature, the manufacturing method of a combustible absorber nuclear fuel pellet through rapid sintering is able to perform sintering at a temperature which is significantly low compared to the existing manufacturing process, prevent boron from volatilizing even if the sintering is performed at a low temperature compared to the existing manufacturing process, and manufacture a pellet having a sintering density equal to or greater than 90 %.