Development of fission product chemistry database ECUME for the LWR severe accident

Miwa, Shuhei  ; Miyahara, Naoya; Nakajima, Kunihisa  ; Nishioka, Shunichiro; Suzuki, Eriko   ; Horiguchi, Naoki   ; Liu, J.  ; Miradji, F.; Imoto, Jumpei ; Afiqa, B. M. ; Takase, Gaku; Karasawa, Hidetoshi; Osaka, Masahiko  

We constructed the first version of fission product (FP) chemistry database named ECUME for LWR severe accident. The first version of ECUME is equipped with dataset of the chemical reactions and their kinetics constants for the reactions of cesium(Cs)-iodine(I)-boron(B)-molybdenum(Mo)-oxygen(O)-hydrogen(H) system in gas phase, the elemental model for the high temperature chemical reaction of Cs with stainless steel, and thermodynamic data for CsBO vapor species and solids of CsSiO and CsFeSiO. The ECUME will provide more accurate estimation of Cs distribution due to the evaluation of effects of interaction with BWR control material B and stainless steel on Cs behavior in the Fukushima Daiichi Nuclear Power Station.