[en] The LIPAC beam dump cooling circuit has been modelled by means of TRACT (TRansport and ACTivation) code. TRACT simulates the flow and isotope transport inside a network of 1-D channels. The cooling circuit consists of the beam dump (inner cone and shroud made of EDP Cu (electrodeposited copper) and the cylinder made of SS304L), the piping from the cooling skid to the beam dump cell and the cooling skid itself composed of the heat exchanger, the purifying loop and the pump. Corrosion is an issue that deserves attention because of radioprotection reasons and because it could affect the cartridge thermomechanical performance. A simulation with TRACT for a water pH of 7 at the beam dump entrance has been performed, showing corrosion rates (< 1 g/(m² year)) which do not compromise the beam dump performance