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Takeuchi, Masayuki; Yano, Kimihiko; Shibata, Atsuhiro; Sambommatsu, Yuji*; Nakamura, Kazuhito*; Chikazawa, Takahiro*; Hirasawa, Izumi*
Journal of Nuclear Science and Technology, 53(4), p.521 - 528, 2016/04
Times Cited Count：2 Percentile：19.71(Nuclear Science & Technology)Kitagaki, Toru; Hoshino, Takanori; Sambommatsu, Yuji; Yano, Kimihiko; Takeuchi, Masayuki; Igarashi, Takeshi*; Suzuki, Tatsuya*
Journal of Radioanalytical and Nuclear Chemistry, 296(2), p.975 - 979, 2013/05
Times Cited Count：4 Percentile：32.48(Chemistry, Analytical)Shibata, Atsuhiro; Yano, Kimihiko; Sambommatsu, Yuji; Nakahara, Masaumi; Takeuchi, Masayuki; Washiya, Tadahiro; Nagata, Masanobu*; Chikazawa, Takahiro*
Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 6 Pages, 2011/12
JAEA has been developing a U crystallization process. The development targets were DFs of over 100, confirmation of mechanical performance of crystallizer, and so on. Fundamental data were obtained by beaker-scale experiments with actual dissolver solution. DFs for most of the FPs are improved by washing. However the formation of Pu-Cs double salt causes low DF of Cs. To confirm the mechanical performance of an annular type crystallizer and a crystal separator, some experiments were carried out. The crystallizer and the separator have good performance. However washing of UNH crystals by the separator did not have the intended effect for solid impurities. We discussed the application of crystal purification technology to improve the purity and selected KCP. UNH crystal purification tests were carried out using bench-scale KCP apparatus with simulated solid impurities. The purifier has good performance on the decontamination of not only liquid impurities but also solid impurities.
Yano, Kimihiko; Sambommatsu, Yuji; Takeuchi, Masayuki; Washiya, Tadahiro; Nagata, Masanobu*; Chikazawa, Takahiro*
no journal, ,
Crystal purification test was carried out with KCP type testing device for uranyl nitrate hexahydrate including solid impurity. It was confirmed the influences of grain size and density of solid impurities on purification performance.
Shibata, Atsuhiro; Sambommatsu, Yuji; Takeuchi, Masayuki; Washiya, Tadahiro; Chikazawa, Takahiro*; Kikuchi, Toshiaki*
no journal, ,
Continuous operation tests were carried out to investigate the effect of temperature profile in the crystallizer on uranium crystal sizes. As the test results, bigger crystals were generated when the solution was cooled slowly.
Takeuchi, Masayuki; Yano, Kimihiko; Sambommatsu, Yuji; Shibata, Atsuhiro; Washiya, Tadahiro; Nagata, Masanobu*; Chikazawa, Takahiro*
no journal, ,
In an uranium crystallization system, a great part of uranium in dissolver liquor with high heavy metal concentration is separated by cooling as uranyl nitrate hexahydrate (UNH) crystal. However, the purity of UNH crystal is not high, so we have discussed the application of crystal purification technology to improve the purity of UNH crystal. In this study, the effects of grain size and density of solid impurities on the purification performance were evaluated in UNH crystal purification tests to discuss the purification mechanism of KCP. From the results, a decontamination factor of smaller grain size of solid impurities was larger than that of bigger one, on the other hand, the density effect was not significant. It is explained that the smaller size of solid impurities is easy to pass through between UNH crystal grains and the decontamination of the solid impurities in the purifier is promoted by pushing down them along the flow of melt.
Shibata, Atsuhiro; Yano, Kimihiko; Sambommatsu, Yuji; Nakahara, Masaumi; Takeuchi, Masayuki; Hirano, Hiroyasu; Nakajima, Yasuo; Washiya, Tadahiro
no journal, ,
no abstracts in English
Yano, Kimihiko; Sambommatsu, Yuji; Takeuchi, Masayuki; Fukushima, Mineo; Washiya, Tadahiro; Nakamura, Kazuhito*; Chikazawa, Takahiro*
no journal, ,
Purification test for Uranyl nitrate hexahydrate(UNH) Crystal with KCP type purifier was carried out on bench scale. Decontamination Factors(DFs) were confirmed on the condition for high uranium recovery.
Nakahara, Masaumi; Shibata, Atsuhiro; Yano, Kimihiko; Sambommatsu, Yuji; Takeuchi, Masayuki; Washiya, Tadahiro
no journal, ,
In order to study a cooling crystallization process for separation of uranyl nitrate hexahydrate crystals, batch experiments were carried out with the dissolver solution derived from irradiated fast neutron reactor core fuel. Basic data were obtained for the precipitation behavior of cesium and plutonium double salt in the course of crystal growth of uranyl nitrate hexahydrate in the uranium crystallization process.
Shibata, Atsuhiro; Yano, Kimihiko; Sambommatsu, Yuji; Takeuchi, Masayuki; Washiya, Tadahiro; Koizumi, Tsutomu; Nakamura, Kazuhito*; Chikazawa, Takahiro*
no journal, ,
no abstracts in English
北垣 徹; 星野 貴紀; 三本松 勇二; 矢野 公彦; 竹内 正行
not registered
JP, 2012-002095 
Patent licensing information Patent publication (In Japanese)
【課題】高効率で迅速な凝集分離性能を有し、ポリマー等の有機化合物を使用せず、かつ、添加剤を極力低減することのできる実用化に適した液中からの放射性元素の分離・除去方法を提供する。 【解決手段】放射性元素を含む液にその放射性元素を吸着する吸着剤を添加して所定時間攪拌する吸着剤添加・攪拌工程と、その吸着剤添加・攪拌工程後に当該液を電解する電解工程と、その電解工程後に当該液中の固形分を分離する固形分分離工程を含むことを特徴とする。
