The Study to wash UNH crystals in the reprocessing process

Yamasaki, Kazuhiko*; not registered; Tamaki, Yoshihisa*

Crystallization procedure is considered to have an adaptability to new reprocessing process based on the PUREX process because it has an advantage in recovering rather pure uranium from contaminated uranium solution without any reagents. Up to now, a small-scale uranium test has been performed to confirm an applicability of crystallization. We focus on the decontamination factor (DF) of FP in the crystallization procedure. Some mock experiments have been also performed and suggested that most of FP is on the surface of crystals in mother liquor. We expected that the content of the mother liquor decreases with increasing of the size of crystals. Consequently it is possible that the DF increases with increasing of the size of crystals. In this study, we performed the experiment to estimate the DF of Ce (ⅵ) of various size of UNH crystals. And our expectation is confirmed.