Preparation and characterization of dicesium tetravalent plutonium hexanitrate

Nakahara, Masaumi; Nomura, Kazunori ; Washiya, Tadahiro ; Chikazawa, Takahiro*; Hirasawa, Izumi*

Characterization of Cs and Pu(IV) nitrate complex was examined to separation from the UNH crystal. This complex is obtained as a precipitate by mixing dissolver solution of MOX fuel and CsNO $_{3}$ solution, which was identified to dicesium tetravalent plutonium hexanitrate, Cs $_{2}$ Pu(NO $_{3}$ ) $_{6}$ by concentration analysis and XRD. The precipitate has a tendency to be generated at high HNO $_{3}$ condition. Thermal analysis shows that the precipitate is stable below 245 $^{circ}$ C, and a weight loss of about 10.29% is observed at 245 $^{circ}$ C. This result corresponds to the decomposition of Cs $_{2}$ Pu(NO $_{3}$ ) $_{6}$ to Cs $_{2}$ PuO $_{2}$ (NO $_{3}$ ) $_{4}$ . According to these properties, the UNH crystal can be melted at 60 $^{circ}$ C to 100 $^{circ}$ C, and separated from the Pu(IV) and Cs complex by a filtration. A new technology of crystal purification method aimed at higher decontamination of UNH crystal in the U crystallization process is proposed.

Language	:	English
Journal	:	Journal of Alloys and Compounds
Volume	:	489
Number	:	2
Pages	:	p.659 - 662
Publication Year/Month	:	2010/01
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Paper URL	:	https://doi.org/10.1016/j.jallcom.2009.09.143
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Keywords	:	no keyword
Research Facility	:	CPF(高レベル放射性物質研究施設)
Press Release	:
Article of JAEA R&D Review	:	Toward Highly Purified Uranyl Nitrate Hexahydrate Crystal; Physicochemical Properties of Plutonium Cesium Nitrate[/]
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Registration No. : AA20080331
JAEA Abstracts No. : 38000041
Paper Submission No. : 6623

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