JAEA thermodynamic database for performance assessment of geological disposal of high-level and TRU wastes; Refinement of thermodynamic data for tetravalent thorium, uranium, neptunium and plutonium

Fujiwara, Kenso ; Kitamura, Akira  ; Yui, Mikazu

Within the scope of the JAEA thermodynamic database project for performance assessment of geological disposal of high-level and TRU radioactive wastes, the refinement of the thermodynamic data for the inorganic compounds and complexes of thorium(IV), uranium(IV), neptunium(IV) and plutonium(IV) was carried out. Refinement of thermodynamic data for the element was performed on a basis of the thermodynamic database for actinide published by the Nuclear Energy Agency in the Organisation for Economic Co-operation and Development (OECD/NEA). About the paper published after the thermodynamic database for actinide ion published, the data was checked and refined.