Chemical impacts of boron on the cesium release and transport behavior under severe accident conditions, 1; Prediction of chemical forms of cesium just after release from fuel in the presence of boron

Miwa, Shuhei  ; Yamashita, Shinichiro   ; Osaka, Masahiko  

The effects of temperature and atmosphere on cesium (Cs) chemical form just after release from fuel were estimated using chemical equilibrium calculation with consideration of the release kinetics of Cs, iodine (I), boron (B) and so on depending on temperature and atmosphere under a severe accident. The calculation results show that Cs vapor species changed according to temperature and atmosphere, and CsBO vapor species was dominant with the existence of B regardless of temperature and atmosphere.