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Understanding Saturated and Unsaturated Behavior in Engineered Components for Waste Repositories

This meeting delves into the performance and interactions of engineered components in geological repositories, focusing on their behavior under saturated and unsaturated conditions. Key components such as carbon steel overpacks, concrete buffers, and sealing materials are essential for ensuring safety functions. Various backfilling and sealing materials have been studied, including bentonite and shot powder. This research emphasizes the need for long-term compatibility and the importance of lab and in-situ characterization for effective modeling and performance assurance of repository systems.

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Understanding Saturated and Unsaturated Behavior in Engineered Components for Waste Repositories

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  1. 9th Exchange MeetingTuesday 6 June 2006 Saturated and unsaturated behaviour in the engineered components

  2. Repositories rely on a multi-function system • The geological barrier • Boom Clay • The engineered components • Each component can fulfill or contribute to different safety functions • Different components can contribute to the same safety function • Long term compatibility throughout the repository system

  3. Many engineered components are involved in a repository Short term: unsaturated phase Long term: saturated phase Shaft sealing Disposal galleries Backfill of access gallery Disposal gallery plug

  4. Engineered components for the Belgian reference case consists in : • Carbon steel overpack • Concrete buffer • Stainless steel envelop • Annular backfill • Gallery lining • Plugs • Backfill materials • Sealing materials

  5. Ensuring that each component will perform its desired function requires the knowledge of: • Unsaturated and saturated behaviourof the components • Interactions between the components • Lab and in-situ characterisation • Modelling

  6. Different types of backfilling and sealing materials were already studied (1) • Bentonite powder/pellets mixture: Bacchus 2, Reseal • Bentonite blocks: Ophelie mock-up CEA/SCK Patent – Dardaine & Volckaert

  7. Different types of backfilling and sealing materials were already studied (2) • Shot powder (ESDRED) • Bentonite • Sand • Cement • Mixture • Grout (ESDRED)

  8. Great efforts were placed in modelling since 1990 • Catsius Clay EC project“Calculation and testing of behaviour of unsaturated clay as barrier in radioactive waste repositories” • Code Brigth (UPC) • Lagamine (ULg)

  9. THM unsaturated behaviour in porous materials – Important issues for a repository – X. Ling Li • RESEAL: A large scale shaft sealing experiment – M. Van Geet • TH concrete behaviour – S. Poyet • SUPERCONTAINER main body concrete modelisation – J. Bel

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