Actinide burner fuel: Potential compositions based on the thermodynamic evaluation of MF–PuF 3 (M = Li, Na, K, Rb, Cs) and LaF 3–PuF 3 systems

Abstract

In previous studies a thermodynamic description of the LiF–NaF–KF–RbF–CsF–LaF 3 system was presented. In order to add PuF 3 to this system the assessments of LiF–PuF 3, NaF–PuF 3, KF–PuF 3, RbF–PuF 3, CsF–PuF 3 and LaF 3–PuF 3 binary phase diagrams have been made. In case of the LiF–PuF 3 and NaF–PuF 3 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 LaF 3, which is considered as a proxy compound for PuF 3. The main aim of this study is to analyze potential compositions for a molten salt fast burner fuel.