Thermodynamic evaluation of the NaCl–MgCl2–UCl3–PuCl3 system

A full thermodynamic description of the quaternary NaCl–MgCl2–UCl3–PuCl3 system, a Molten Salt Fast Breeder Fuel, is presented. The binary phase diagrams have been assessed in this study and the data were used to extrapolate the higher order systems. To optimize the excess parameters of the liquid phase the modified quasi chemical model has been used, while for the solid solution the classical polynomial model has been applied. From the obtained results a possible fuel composition for the Molten Salt Reactor has been evaluated.