Basic research programs of vitrification technology for waste volume reduction, 42; Bottom drain test and synchrotron X-ray absorption analysis of iron phosphate glass sample containing simulated HLLW

Okamoto, Yoshihiro  ; Kobayashi, Hidekazu ; Nagai, Takayuki  ; Kobayashi, Hiromi*; Homma, Masanobu*; Hirono, Kazuya*; Hatakeyama, Kiyoshi*; Shiwaku, Hideaki   

Bottom drain test of iron phosphate glass containing simulated high level liquid waste (HLLW) components were performed using small size melting furnace. The glass samples collected from the furnace was analyzed by synchrotron radiation based XAFS technique. The 20wt% HLLW components was mixed with the iron phosphate glass having a composition of 35mol%FeO-PO was used as base glass. They were melted and kept at 1150C in the furnace and the melts were drained out to 6 alumina crucibles. As the results of XAFS analysis for the solidified samples, oxidation state of cerium was trivalent and that of molybdenum was pentavalent. Their oxidation states are more reducing in comparison with borosilicate glass samples. The imaging XAFS analysis showed that small RuO particles distributed in the sample were not aggregated in the glass sample. These results were compatible with our previous work in which the glass samples were prepared only in crucibles.