What is it about?
Several metallic materials have been proposed as corrosion-resistant barriers in geological repositories to provide containment to high-level nuclear waste. In this work, the different degradation modes for each type of metal/alloy proposed as a barrier are discussed. These degradation modes depend not only on the selected material but also on the environment in contact with the material. Selection of the host rock and design of the other engineering barriers will affect the performance of the nuclear waste container. The effects of the environmental and metallurgical variables on the degradation of the container are discussed.
Why is it important?
Selection of a metallic material as a corrosion-resistant barrier for the waste container is intimately related to the engineered barrier system as a whole and with the previously selected host rock. The degradation mechanisms that are expected in each case depend on the selected material and the evolution of metallurgical and environmental conditions over time. Some degradation modes may be avoided or minimized by appropriate material or backfill selection. It is very important for the national programs of nuclear waste management to identify and assess the anticipated degradation modes of the selected materials in a time-evolving environment.
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This page is a summary of: Anticipated Degradation Modes of Metallic Engineered Barriers for High-Level Nuclear Waste Repositories, JOM, February 2014, Springer Science + Business Media, DOI: 10.1007/s11837-014-0873-7.
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