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)

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

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.