51313-02735-Simulation of Anaerobic Corr. of CS Fuel Containers & Impact of Corr. Products on Other Barriers

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Product Number: 51313-02735-SG

ISBN: 02735 2013 CP

Author: Fraser King

Publication Date: 2013

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The Nuclear Waste Management Organization (NWMO) is carrying out a research and development program to support implementation of Adaptive Phase Management for the long-term management of Canada’s used nuclear fuel. The NWMO program includes technologies associated with a deep geological repository (DGR) for used fuel in a suitable geological formation such as crystalline rock or sedimentary deposits. Any such repository would be based on a multi-barrier design comprising a number of natural and engineered barriers. One of the engineered barriers would be a long-lived used-fuel container designed to provide long-term containment and isolation of used fuel for a considerable length of time. Copper is the reference container material for the disposal of used fuel in a DGR in crystalline rock whilst carbon steel is being considered for a repository in sedimentary host rock.

The corrosion behaviour of the container will change with time as the repository environment evolves from an initial period of warm aerobic conditions to a long-term cool anaerobic phase that will persist indefinitely. The aerobic phase is expected to be relatively short (of the order of tens to a few hundred years) because of the limited amount of oxygen available in a DGR located several hundred metres below the water table. Therefore anaerobic conditions will exist for the vast majority of the service life of the container.