Molten salt actinide recycler and transforming system without and with Th–U support: Fuel cycle flexibility and key material properties

•We examine feasibility of MOSART system without and with U–Th support.•We experimentally studied key material properties to prove MOSART flowsheet.•MOSART potential as the system with flexible fuel cycle scenarios is emphasized.•MOSART can operate with different TRU loadings in transmuter or even breeder modes.

A study is under progress to examine the feasibility of MOlten Salt Actinide Recycler and Transforming (MOSART) system without and with U–Th support fuelled with different compositions of transuranic elements (TRU) trifluorides from spent LWR fuel. New design options with homogeneous core and fuel salt with high enough solubility for transuranic elements trifluorides are being examined because of new goals. The paper has the main objective of presenting the fuel cycle flexibility of the MOSART system while accounting technical constrains and experimental data received in this study. A brief description is given of the experimental results on key physical and chemical properties of fuel salt and combined materials compatibility to satisfy MOSART system requirements.