%0 Conference Paper %F Oral %T Evaluation of gas transport models in heterogeneous porous media at different spatial and time scales in HLW repositories %+ Unité d'expertise et de modélisation des installations de stockage (IRSN/PSE-ENV/SEDRE/UEMIS) %+ Institut de la Francophonie pour la Médecine Tropicale (IFMT) %A Saadi, Zakaria %A Amri, Abdellah %A Ababou, Rachid %< avec comité de lecture %B SITRAM'19 - Advances in the SImulation of reactive flow and TRAnsport in porous Media %C Pau, France %8 2019-12-03 %D 2019 %Z Environmental SciencesConference papers %X The aim of this talk is to present some examples of two-phase flow and two-component (gaswater)transport problems at diferent scales based on TOUGH code capabilities, which havebeen studied in the framework of a safety case of a high level waste (HLW) repository. Thefirst example presented at small scale (meters and days) is the simulation of the in-situ PGZexperimentof nitrogen transport in the Callovo-Oxfordian (COx) clay rock. This exampleshows the importance of air-entry pressure as a parameter in the COx-hydraulic properties forenhancing simulation of nitrogen pressure in the COx. The second example is the hydrogentransport at cell and module scales (dozen to hundreds of meters, thousands of years) of aHLWrepository site, where the problem of interfaces is invoked. The last example deals withthe problem of the impact of piston flow of hydrogen on radionuclides transport at the scaleof the repository site (kilometers, thousands of years), where a simplified repository modelis used in order to study this impact. Finally, discussions about some studies on progress arepresented, especially modelling of hysteresis, gas-solubility and geo-mechanics, which canhave a great impact on gas transport at different scales. %G English %L irsn-03565775 %U https://irsn.hal.science/irsn-03565775 %~ SDE %~ IRSN %~ GIP-BE %~ PSEENV %~ SEDRE