THERMODYNAMIC CALCULATION OF PHASE EQUILIBRIA IN OXIDE COMPLEX SYSTEMS : PREDICTION OF SOME SELECTED FISSION PRODUCTS (BaO, SrO, La2O3) RELEASES
Résumé
In a previous paper [1], we have established the status of the art reached jointly by THERMODATA and IPSN from 1988 up
today on the subject of thermodynamic data bases and equilibrium calculation code adapted to the molten core concrete interaction
(M.C .C .I.).
This paper deals about the extension of the data base of 5 oxides (UO2, ZrO2, SiO2, CaO, A1203) to 3 selected other oxides (BaO, SrO, La203), including condensed and gas phases together, in order to predict the fission products release with a good reliability, taking into account the non-ideal behaviour of the oxides in the condensed phase.
The necessity of a realistic thermodynamic modelling of condensed solution phases has been demonstrated in the first paper, and the three oxides BaO, SrO and La203 have been chosen to represent the non-volatile fission products and because thermodynamic data exist in the literature for these species.