[2L16-20] Vitrification 3

[2L19] Reduction and Resource Recycling of High-level Radioactive Wastes through Nuclear Transmutation

Decomposition of Vitrified Wastes and Elution Behavior of Simulated Nuclides in Acidic Aqueous System

*Koichiro Takao¹, Takahiro Mori¹, Akihiro Uehara², Yasuhisa Ikeda¹ (1. TokyoTech, 2. Kyoto Univ.)

Keywords:Vitrified wastes, Acid treatment, Elution, ImPACT program

To separate long-lived fission products from vitrified high-level wastes, we studied decomposition of glass matrix and elution behavior of simulated nuclides in acidic aqueous system. As a result, 35 wt% of the glass sample was lost after the treatment with acid, corresponding to dissolution of main components of the glass (B, Ca, Al, Zn, Na, and Li) except for SiO₂. Furthermore, most simulated nuclides were found to be significantly eluted from the glass sample.