In the multi-barrier concept for the safe long-term storage of high-level nuclear waste in deep geological repositories, the stability of the individual barriers is a key factor.
The stability of the individual barriers, such as the outer and inner canister materials, and the buffer materials (clays, cementitous materials), depend on a variety of hydro-bio-geochemical factors, but also on the materials used in each case. Material stability and forecast of material degradation phenomena in the long-term are important aspects to be adressed in the safety case and the design of a deep geological repository. This session adresses the interplay between timely and rapid research and development of canister and disposal concepts versus the reliable assesment of the long-term material behavior used in a multi-barrier concept, with a special focus on corrosion issues. Topics of interest are:
- Corrosion studies on potential canister materials
- Application orientied material and canister development and testing
- Stability and degradation of buffer and filler materials affected by corrosion
- Modelling of material behavior on long time-scales with respect to hydro-bio-geochemical induced corrosion phenomena
This session covers by an interdisciplinary approach the challenge to adress and forecast material behavior for the timely implementation of a safe deep geological repository.