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Senzaki, Tatsuya; Arai, Yoichi; Yano, Kimihiko; Sato, Daisuke; Tada, Kohei; Ogi, Hiromichi*; Kawanobe, Takayuki*; Ono, Shimpei; Nakamura, Masahiro; Kitawaki, Shinichi; et al.
JAEA-Testing 2022-001, 28 Pages, 2022/05
JAEA-Testing-2022-001.pdf:2.33MB
In preparation for the decommissioning of Laboratory B of the Nuclear Fuel Cycle Engineering Laboratory, the nuclear fuel material that had been stored in the glove box for a long time was moved to the Chemical Processing Facility (CPF). This nuclear fuel material was stored with sealed by a polyvinyl chloride (PVC) bag in the storage. Since it was confirmed that the PVC bag swelled during storage, it seems that any gas was generated by radiolysis of the some components contained in the nuclear fuel material. In order to avoid breakage of the PVC bag and keep it safety for long time, we began the study on the stabilization treatment of the nuclear fuel material. First, in order to clarify the properties of nuclear fuel material, radioactivity analysis, component analysis, and thermal analysis were carried out. From the results of thermal analysis, the existence of organic matter was clarified. Then, ion exchange resin with similar thermal characteristics was selected and the thermal decomposition conditions were investigated. From the results of these analyzes and examinations, the conditions for thermal decomposition of the nuclear fuel material contained with organic matter was established. Performing a heat treatment of a small amount of nuclear fuel material in order to confirm the safety, after which the treatment amount was scaled up. It was confirmed by the weight change after the heat treatment that the nuclear fuel material contained with organic matter was completely decomposed.
; Wadachi, Yoshiki
Nihon Genshiryoku Gakkai-Shi, 18(2), p.70 - 74, 1976/02
no abstracts in English
; Wadachi, Yoshiki
Nihon Kagakkai-Shi, 1974(4), p.617 - 621, 1974/04
no abstracts in English
; Wadachi, Yoshiki
Journal of Nuclear Science and Technology, 10(9), p.551 - 555, 1973/09
no abstracts in English
Co(II) and 
Ce(III) in extremely low concentrations on the chelating resin; Wadachi, Yoshiki
Nihon Kagakkai-Shi, 1973(4), p.643 - 647, 1973/04
no abstracts in English
Wadachi, Yoshiki;
Dai-21-Kai Kobunshi Kaki Daigaku Koen Yoshishu, p.99 - 104, 1973/00
no abstracts in English
Fukuda, Yuhei; Arai, Yoichi; Suganuma, Takashi; Hinai, Hiroshi; Sano, Yuichi; Shibata, Atsuhiro; Nomura, Kazunori
no journal, ,
no abstracts in English
Watanabe, Takahiro; Kokubu, Yoko; Murakami, Hiroaki; Iwatsuki, Teruki
no journal, ,
REEs (Rare Earth Elements) pattern in geological and natural water samples possibly provides changes in past redox condition and sources of materials. However, quantitative analysis of REEs in these samples has been difficult because of those relative low content and mass interference for ICP-MS analyses. In this study, we improved pre- concentration and separation methods of the REEs using Chelate resin (Nobias Chelate PA1, Hitachi High Technologies). The authentic materials and natural water samples were used for evaluation of these methods. REEs and other elements concentrations were measured by ICP-MS (Agilent 7700). Recovery rates of REEs, U and Mo were more than 90% in this study. Additionally, more than 99% of Ba, As and Sr were removed. For the natural samples (spring water), the REEs pattern obtained from the Chelate resin method was good agreement with that of previous method (interference calibration method).
Kida, Fukuka*; Nakamura, Fumiya*; Arai, Tsuyoshi*; Matsushima, Ryotatsu; Saito, Yasuo
no journal, ,
no abstracts in English
