Concrete is widely used in nuclear facilities (Nuclear Power Plants, Deep Geological Repository) and participate to ensure their safety. Aging may deeply impact the mechanical and containment properties of structures made ofeither concrete orreinforced concrete. Present knowledge regarding concrete pathologies is mainly based upon small-scale and separate effect experiments at laboratory level. Within this context, IRSN started the ODOBA international program. Its main objective is to improve the understanding of phenomena related to aging, to assess and qualify Non Destructive Examination and to develop and validate numerical models to predict pathologies evolutions at structural scale. ODOBA experimentation is mainly performed in Cadarache (South-East of France) on the ODE platform and consists oflarge-scale concrete specimenspecimen, highly instrumented. As today, 17 specimens representing containment building issue, were cast. DEF, ASR and coupled ASR/DEF are studied. The majority ofthe specimens will be submitted to accelerated aging by immersion in heated water pool. Some specimenspecimens are reinforced with steel rebars. First deformations are foreseen at the beginning of 2020. Today, ODOBA partners include USNRC, CNSC (Canada), Bel V (Belgium), VTT (Finland) and NRA (Japan). NSC (China) should soon sign the ODOBA agreements.