Thermal-hydraulic design methodology and trade-off studies for a dual-salt breed-and-burn molten salt reactor

•Concentric fuel tube proposed for a breed-and-burn reactor with separate fuel and coolant salt.•Finite-difference model developed to predict temperatures in concentric fuel.•Design search algorithm identified valid operational parameters within defined constraints.•Thermal-hydraulic performance trade-offs evaluated to narrow design space for BBMSR fuel.