As part of the reprocessing of spent uranium oxide fuels, the final high-activity liquid waste is packaged in glasses by a two-step process, calcination then vitrification. Calcination gradually transforms the liquid waste into a dry residue, which is mixed with preformed glass in a melting furnace. The calciner consists of a rotating tube heated by a resistance furnace. The calcined solutions consist of nitric acid and compounds in their nitrate form or insolubles in the form of metal alloys. With the aim of improving control of the control of the calciner, it is proposed to model it: thesis work (to begin at the end of 2024) will make it possible to create and couple 3 models (thermodynamic, thermal, flow). The internship work will consist of anticipating the thesis work with the acquisition of experimental data: ATD and ATG measurements, most certainly coupled with a type approach.