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Report No.
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Analysis of sludge in the dissolver and survey of the behavior of zirconium molybdate

Kondo, Yoshikazu; Uchida, Naoki; Terunuma, Hirotaka; Tanaka, Kosuke  ; Oyama, Koichi ; Katsurai, Kiyomichi; Washiya, Tadahiro 

The composition of sludge in the dissolver after dissolution of PWR and ATR fuels at the Tokai Reprocessing Plant (TRP) was analyzed. As a result the presence of zirconium molybdate was confirmed by the analysis of X-ray diffraction (XRD). To clarify the formation behavior of the precipitates of zirconium molybdate, investigated the dependence of HNO$$_{3}$$ concentration on the precipitation with Mo and Zr solution. To evaluate the adhesion on the metal surface (stainless steel and Ti metal), the deposition amounts of the precipitates of zirconium molybdate on the metal were also examined. In addition, it reports on the comparative result of executing a chemical dissolution of the precipitates by using the solutions of NaOH, C$$_{2}$$H$$_{2}$$O$$_{4}$$-HNO$$_{3}$$ and H$$_{2}$$O$$_{2}$$-HNO$$_{3}$$.

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