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Yokochi, Masaru; Goto, Yuichi; Kuno, Sorato; Suzuki, Yoshimasa; Yamamoto, Masahiko; Taguchi, Shigeo; Usui, Masato*; Onose, Taku*; Miyamoto, Toshihiko*; Mori, Eito*
Nihon Hozen Gakkai Dai-21-Kai Gakujutsu Koenkai Yoshishu, 4 Pages, 2025/07
Analysis facility in Tokai Reprocessing Plant, which is shifted to decommissioning stage, have been installed about 60 Grove Boxes to handling the nuclear fuel materials. Of these, progressing an aging accompanied by long use for 20 years more than half. This time, removal the special Grove Box that equipped the Thermal Ionization Mass Spectrometry, necessary safeguard analysis for nuclear fuel materials. This report summarized the removal techniques of the special Grove Box, the number of working days, workers and amount of waste generated in this removal work.
Yokochi, Masaru; Sasaki, Shunichi; Yanagibashi, Futoshi; Asada, Naoki; Komori, Tsuyoshi; Fujieda, Sadao; Suzuki, Hisanori; Takeuchi, Kenji; Uchida, Naoki
Nihon Hozen Gakkai Dai-20-Kai Gakujutsu Koenkai Yoshishu, p.1 - 4, 2024/08
Tokai Reprocessing Plant, which is shifted to decommissioning stage, stores large amount of high-level radioactive liquid waste (HLLW) generated by reprocessing of spent nuclear fuels in High-level Active Waste facility (HAW). Radioactive risk related to HLLW has been concentrated in HAW until the completion of vitrification. Natural disasters such as earthquake may damage cooling function of HAW. Therefore, HAW must improve earthquake resistance, as exchanging the ground around HAW facility and pipe trench by concrete. This earthquake resistance construction starts from July of 2020 and completed in March 2024. This report summarizes the construction work and describes the inspection results after the construction.
Yokochi, Masaru; Goto, Sho; Mori, Amami; Seto, Nobuhiko; Taguchi, Shigeo
no journal, ,
In the nuclear fuel reprocessing facility, plutonium contaminated grove-boxes should need to be removed and dismantled for replace or decommissioning. It is important to decontaminate stainless-steel surfaces of grove-boxes before dismantling in order to reduce the risk and reduce the amount of plutonium contaminated wastes. This research investigates the electrolytic decontamination method as a means of decontaminating the stainless-steel surfaces of grove-boxes. This paper reports on the preliminary tests to confirm the applicability of electrolytic polishing to plutonium decontamination of stainless-steel surfaces.