Incorporating long-term monitoring into a modified nuclear fuel waste repository

An approach to long-term monitoring for a Canadian geologic repository for the isolation of used nuclear fuel waste is described. The monitoring approach begins with the siting of the facility and continues with preclosure monitoring through repository operation, extended underground monitoring, decommissioning and closure. At the completion of the closure activities, the repository should be passively safe. A program of postclosure monitoring from surface is proposed that could continue as long as required by stakeholders. The proposed postclosure monitoring program described should not jeopardise the long-term, passive safety of the repository. (author)