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燃料デブリの分析精度向上のための技術開発2020年度成果報告(廃炉・汚染水対策事業費補助金)

Development of technologies for enhanced analysis accuracy of fuel debris; Summary results of the 2020 fiscal year (Subsidy program for the project of decommissioning and contaminated water management)

池内 宏知  ; 小山 真一  ; 逢坂 正彦  ; 高野 公秀 ; 中村 聡志 ; 小野澤 淳 ; 佐々木 新治  ; 大西 貴士  ; 前田 宏治  ; 桐島 陽*; 秋山 大輔*

Ikeuchi, Hirotomo; Koyama, Shinichi; Osaka, Masahiko; Takano, Masahide; Nakamura, Satoshi; Onozawa, Atsushi; Sasaki, Shinji; Onishi, Takashi; Maeda, Koji; Kirishima, Akira*; Akiyama, Daisuke*

燃料デブリ試料の核種・元素量の分析に向けて、酸溶解を含む一連の分析技術を確立する必要がある。本事業では、分析精度の現状レベルの把握と不溶解性残渣発生時の代替手法の確立を目的として、ブラインド試験が実施された。模擬燃料デブリ(特定の組成を持つ均質化された粉末)を対象に、日本国内の4分析機関においてそれぞれが有する溶解・分析技術を用いて、全体組成の定量値が取得された。各技術の特徴(長所・短所)を評価した結果に基づき、燃料デブリの暫定的な分析フローを構築した。

A set of technology, including acid dissolving, has to be established for the analysis of content of elements/nuclides in the fuel debris samples. In this project, a blind test was performed for the purpose of clarifying the current level of analytical accuracy and establishing the alternative methods in case that the insoluble residue remains. Overall composition of the simulated fuel debris (homogenized powder having a specific composition) were quantitatively determined in the four analytical institutions in Japan by using their own dissolving and analytical techniques. The merit and drawback for each technique were then evaluated, based on which a tentative flow of the analyses of fuel debris was constructed.

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