[3B01-04] Nuclide Adsorption & Separation 1

[3B03] Development of Minor Actinides separation and storage technology by process using flame-retardant and low heat of vaporization diluent and CHON extractant

(9)Productions of uranium-based solid matrix containing lanthanides by distillation and heating processes

*Tomoo Yamamura¹, Chihiro Tabata¹, Mariko Konaka¹, Masahiko Nakase², Miki Harigai², Koichi Kakinoki³, Naoki Ogawa³, Ryokichi Hamaguchi³, Taisuke Tsukamoto³, Takashi Shimada³ (1. KURNS, Kyoto Univ., 2. Tokyo Tech, 3. MHI)

Keywords:Actinides, Lanthanides, fluorite-structure oxides

Direct oxide formation from distillation using flame-retardant low-evaporation heat diluents was investigated from the viewpoint of stable storage of minor actinides (MAs) separated by solvent extraction as exothermic oxide solid solutions for a period of several decades. A new synthesis method of uranium dioxide matrix with fluorite structure as a stable oxide solid and a study on the solid solution method of rare earths are reported.