Research and development for next generation vitrification technology by using synchrotron radiation based analytical technique

Okamoto, Yoshihiro  ; Shiwaku, Hideaki   ; Nagai, Takayuki  ; Kobayashi, Hidekazu ; Sasage, Kenichi; Kawashima, Hidenori*; Kakihara, Toshiaki*

The vitrification technique is thought to be effective in immobilization of high-level radioactive liquid waste (HLLW). To the nuclear waste glass, higher waste loading and low leach rate are required. Synchrotron radiation based X-ray absorption fine structure (XAFS) analysis is useful to investigate the local coordination structure and chemical state of the FP component in the waste glass, since many kinds of elements more than 30 are contained in the glass. We have analyzed many glass samples by using JAEA beamline facility at the SPring-8, in conjunction with many coworkers. Since FY2016, we joined the Research and Development program for next generation reprocessing and vitrification technology carried out by assistance of Agency of Natural Resources and Energy (METI). Synchrotron radiation based XAFS work on the improvement activity of borosilicate glass system and substitute to iron phosphate glass system carried out in the program are introduced in this presentation.