ARC ("Affordable, Robust and Compact reactor") is a conceptual design of a nuclear fusion reactor developed by the "Massachusetts Institute of Technology (MIT) Plasma Science and Fusion Center". ARC is a tokamak with a power of 200–250 MWe, which uses molten salts of fluorine, lithium and beryllium (FLiBe) as coolant. Once built, it will aim to reduce the costs, the complexity and the size of nuclear fusion plants. In the present study will be proposed a possible design of a heat exchanger to be implemented in the ARC design for the heat transfer from the FLiBe to a secondary fluid used within a Brayton cycle for electricity generation.