Thermodynamic study of LiF–BeF2–ZrF4–UF4 system

Abstract In this work the three binary phase diagrams LiF–ZrF 4 , BeF 2 –ZrF 4 and UF 4 –ZrF 4 were thermodynamically assessed. The three ternary phase diagrams LiF–BeF 2 –ZrF 4 , BeF 2 –ZrF 4 –UF 4 and LiF–ZrF 4 –UF 4 were approximated on the basis of binary data. A pseudo-ternary LiF–BeF 2 –ZrF 4 system with constant amount of UF 4 set to 0.83 mol% was calculated as well, typical for molten salt reactor fuel. Based on this diagram a suggestion for the composition of the fuel in this system was made.