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Journal Articles

Stabilization processing of hazardous and radioactive liquid wastes derived from advanced aqueous separation experiments for safety handling and management of waste

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.

Oral presentation

Ion-exchange experiments of Nb and Ta in HF/HNO$$_{3}$$ solution for identification of fluoride species of Db

Toyoshima, Atsushi; Mitsukai, Akina; Murakami, Masashi*; Sato, Daisuke*; Motoyama, Risa*; Oe, Kazuhiro*; Komori, Yukiko*; Haba, Hiromitsu*; Asai, Masato; Tsukada, Kazuaki; et al.

no journal, , 

The purpose of the present study is characterization of fluoride complexes of Db. In this study, we investigated anion-exchange behavior of Nb and Ta, lighter homologs of Db, in 1.0-24 M HF/2.0 M HNO$$_{3}$$ solutions as a model experiment of Db. $$^{95g}$$Nb and $$^{179}$$Ta produced at JAEA tandem accelerator and RIKEN AVF cyclotron, respectively, were prepared as non-carrier-added radiotracers by an ion exchange method. Batch experiments were performed with anion-exchange resin. As a result, distribution coefficients ($${it K}$$$$_{d}$$) of Nb showed a sharp increase at $$>$$ 6 M HF while those of Ta had a monotonic decrease as increasing HF concentration. This suggests that Nb forms fluoride complexes from oxy fluoride one at $$>$$ 6 M HF and Ta exists as fluoride complexes under the conditions. It is expected that chemical species of Db fluorides are characterized in its anion-exchange experiments under the present conditions.

Oral presentation

Development of determination methods for $$beta$$ ray emitting nuclides at CPF

Motoyama, Risa; Hinai, Hiroshi; Ichige, Yoshiaki; Shibata, Atsuhiro; Nomura, Kazunori

no journal, , 

Various properties of radioactive wastes generated at the Fukushima Daiichi Nuclear Power Station have been analyzed at Chemical Processing Facility (CPF) in Japan Atomic Energy Agency (JAEA) to contribute to their future treatment and disposal studies. The radioactive concentration of $$beta$$ ray emitting nuclides is one of the essential information as well as those of $$alpha$$ ray and $$gamma$$ ray emitting nuclides. It needs to develop separation and purification methods for each $$beta$$-emitter from unfamiliar mediums to the nuclear fuel cycle field. Due to the restrictions of the facility, these methods should avoid using halogen reagents. The steady analysis procedures of H-3, Sr-90 and I-129 have been already developed and in practice. Among them, the analysis method of I-129 will be presented and the determination method for Se-79 will be reported as issue currently under consideration.

Oral presentation

Determination of radioactivity for secondary wastes generated from treatment of contaminated water at the Fukushima Daiichi Nuclear Power Station

Motoyama, Risa; Hinai, Hiroshi; Ichige, Yoshiaki; Shibata, Atsuhiro; Nomura, Kazunori

no journal, , 

no abstracts in English

Oral presentation

Development of determination methods for $$beta$$ ray emitting nuclides with nitric acid solution; Determination method for Se-79

Motoyama, Risa; Hinai, Hiroshi; Ichige, Yoshiaki; Shibata, Atsuhiro

no journal, , 

no abstracts in English

Oral presentation

Characterization of radioactive samples at Fukushima Daiichi NPS site, 3; Development of determination method for Se-79 with nitric acid solution

Motoyama, Risa; Hinai, Hiroshi; Ichige, Yoshiaki; Koma, Yoshikazu; Shibata, Atsuhiro

no journal, , 

no abstracts in English

Oral presentation

Characterization of radioactive samples at Fukushima Daiichi NPS site, 4; Development of determination method for Ni-63 with nitric acid solution

Motoyama, Risa; Hinai, Hiroshi; Koma, Yoshikazu; Shibata, Atsuhiro

no journal, , 

no abstracts in English

Oral presentation

Characterization of radioactive samples at Fukushima Daiichi NPS site, 5; Analysis of Ni-63 in contaminated water and secondary wastes

Motoyama, Risa; Hinai, Hiroshi; Koma, Yoshikazu; Kitawaki, Shinichi

no journal, , 

no abstracts in English

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