Computational approach to the evaluation of fission product behaviors

Miwa, Shuhei  ; Nakajima, Kunihisa  ; Suzuki, Chikashi ; Rizaal, M.   ; Suzuki, Eriko   ; Horiguchi, Naoki   ; Osaka, Masahiko  

We have proceeded the fundamental study for the improvement of the evaluation of fission product (FP) chemistry and the treatment of fine space resolution which are main issues for the evaluation of FP behaviors in a severe accident (SA). We have been developing FP chemistry database named ECUME for the improvement of SA analysis codes. We prepared thermodynamic data for Cs compounds which is no experimental data available by computational approach. Regarding the space resolution issue, we have been developing analysis tool named CHASER based on 3D-CFD code with the model for FP chemistry. More accurate evaluation of FP behavior can be achieved by incorporating ECUME to the CHASER.