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   Since copper is generally accepted to be thermodynamically stable in the anaerobic saline groundwaters anticipated in a Swedish nuclear waste repository, it has been selected as the corrosion-resistant material for the fabrication of nuclear fuel waste containers. The only corrosion threat to the durability of these containers is attack by sulphide derived from either mineral dissolution or/and microbial activities. The aim of this project is to characterize the influences of groundwater chemistry (i.e. sulphide and groundwater chloride) on the film growth kinetics and film properties, to determine the growth mechanism of copper sulphide films in the Swedish repository environments, and finally to develop a model to predict the long-term corrosion process and mechanism of copper under repository conditions.