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Watanabe, So; Takahatake, Yoko; Ogi, Hiromichi*; Osugi, Takeshi; Taniguchi, Takumi; Sato, Junya; Arai, Tsuyoshi*; Kajinami, Akihiko*
Journal of Nuclear Materials, 585, p.154610_1 - 154610_6, 2023/11
Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)Nakahara, Masaumi; Watanabe, So; Ogi, Hiromichi*; Arai, Yoichi; Aihara, Haruka; Motoyama, Risa; Shibata, Atsuhiro; Nomura, Kazunori; Kajinami, Akihiko*
Proceedings of International Nuclear Fuel Cycle Conference / Light Water Reactor Fuel Performance Conference (Global/Top Fuel 2019) (USB Flash Drive), p.66 - 70, 2019/09
A wide variety of hazardous and radioactive liquid waste has generated derived from an advanced aqueous separation experiments in the Chemical Processing Facility. Therefore, they should be stabilized for the safety handling and management. In this study, we report a precipitation or an oxidation for hazardous materials, a solvent extraction for recovery of nuclear materials, and a concentration of solution by a freeze-drying method.
Kajinami, Akihiko*; Watanabe, So
no journal, ,
no abstracts in English
Kajinami, Akihiko*; Watanabe, So
no journal, ,
no abstracts in English
Myochin, Munetaka; Kofuji, Hirohide; Yamana, Hajimu*; Shirai, Osamu*; Yamamura, Tsutomu*; Umesaki, Norimasa*; Matsuura, Haruaki*; Kajinami, Akihiko*; Iwadate, Yasuhiko*; Otori, Norikazu*; et al.
no journal, ,
no abstracts in English
Suzuki, Seiya; Watanabe, So; Arai, Yoichi; Nakamura, Masahiro; Kajinami, Akihiko*
no journal, ,
Vitrification technology has been adopted as a treatment technology for high-level radioactive liquid waste (HLLW). In this vitrification process, HLLW is mixed with borosilicate glass that has been heated to over 1000 degree Celsius and melted, and then rapidly cooled to form a chemically stable solidified product. In this way, vitrification technology has already been established. On the other hand, there are some drawbacks of this technology due to the high temperature. Our group is focusing on a procedure to immobilize radioactive species into a chemically stable material at lower temperatures using freeze-drying (FD) technology. In the experiment on simulating HLLW, it was confirmed that major elements such as Ru, Pd and Nd were retained in the solidified material. The retention mechanism of cation groups in the solidified material is presumed to be electrostatic interaction with negatively charged sites in the matrix. However, Mo and Zr were eluted as anionic species. Tc, which is included as an anion species in HLLW, was not targeted in the simulated experiment, but immobilization of volatile Tc is challenging and important. In this study, to establish an immobilization technology of Tc, FD solidification tests on a nitric acid solution of 99Tc were carried out, and the immobilization mechanism of anion species is discussed.
