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Report No.
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Development of solubility improvement technology for nitric acid of plutonium dioxide in scrap MOX powder

Kato, Yoshiyuki 

In the MOX pellet fabrication process, the MOX powder is mixed, granulated and is pressed and finally sintered MOX pellet. In addition only a little part of MOX powder disperses in a globe box and adheres to its wall and floor. The scattered MOX powder becomes dirty. This waste MOX powders have been called as dirty MOX powders and stored. MOX powders which do not meet the specification are rejected from the MOX pellet fabrication process. By the conventional method, MOX powder is pelletized once. The pellet was dissolved with hot nitric acid. Recovery is possible by extracting plutonium out of a nitric acid solution. In this study, a simple method to recover MOX was developed. Generally, MOX powders cannot dissolved in a nitric acid at room temperature. And then, MOX powders are reacted with silicon compound (SiC) and dissolved in a nitric acid at room temperature. Nearly 70% of plutonium was recovered with uranium.

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