Actinide burner fuel: Potential compositions based on the thermodynamic evaluation of MF–PuF3 (M = Li, Na, K, Rb, Cs) and LaF3–PuF3 systems

In previous studies a thermodynamic description of the LiF–NaF–KF–RbF–CsF–LaF3 system was presented. In order to add PuF3 to this system the assessments of LiF–PuF3, NaF–PuF3, KF–PuF3, RbF–PuF3, CsF–PuF3 and LaF3–PuF3 binary phase diagrams have been made. In case of the LiF–PuF3 and NaF–PuF3 the assessments have been based on known experimental data. The other binary systems have not been measured yet and the thermodynamic description has been made using the excess parameters from the previously assessed binaries containing LaF3, which is considered as a proxy compound for PuF3. The main aim of this study is to analyze potential compositions for a molten salt fast burner fuel.