1) The document describes a study that implemented a fully-coupled thermo-hydro-mechanical (THM) model in PLAXIS 2D finite element software and applied it to simulate radioactive waste storage. 2) The case study modeled two underground galleries excavated in clay for waste storage, applying heat fluxes from the waste. Results showed maximum displacements of 12.9 cm during excavation and temperatures up to 360K after 444 years of heating. 3) Pore pressures increased initially due to heating but then returned to hydrostatic conditions as the tunnels closed and recharged with water. The THM model successfully simulated expected phenomena and can be used for further repository studies.