[en] The knowledge of possible evolution of conditioned wastes during intermediate storage, handling and deep repository is necessary to define the operating conditions for storage and disposal and to warrant the safety of workers during these operations. These operating conditions can depend on gas production and on chemicals able to promote corrosion. The origin of gas production can be: the waste itself, producing radon and gases from alpha and gamma radiolysis, the radiolysis of organic compounds carried by wastes, the chemical or biological corrosion of embedding matrix and structural material. This paper describes progress and result of research programs on biodeterioration of bitumen and of bitumen conditioned waste; cement biodeterioration; concrete behaviour for high radon producing wastes. 1 fig., 1 tab