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Overview of past and on-going experiments in the HADES URL

Overview of past and on-going experiments in the HADES URL. B. Neerdael, X. Sillen, M. Van Geet, G. Volckaert SCK•CEN Conference & Workshop on the Experimental Programme of the URF HADES Mol - January, 27-29, 2004. Framework. Geological disposal programme: Characterisation of waste forms

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Overview of past and on-going experiments in the HADES URL

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  1. Overview of past and on-going experimentsin the HADES URL B. Neerdael, X. Sillen, M. Van Geet, G. Volckaert SCK•CEN Conference & Workshop on the Experimental Programme of the URF HADES Mol - January, 27-29, 2004

  2. Framework Geological disposal programme: • Characterisation of waste forms • Behaviour of these waste forms in a clay environment • Characterisation of the geosphere • Study of the different processes controlling transport of the radionuclides to the biosphere • Concept and repository construction Use of URL in order to • Provide experimental conditions close to disposal ones • Take into account space and time scales

  3. EUROPEAN UNDERGROUND RESEARCH INFRASTRUCTURE FOR DISPOSAL OF NUCLEAR WASTE IN CLAY ENVIRONMENT

  4. Content • General • Construction (feasibility) • In-situ tests (mechanism’s understanding) • Long-term large scale integrated tests (demonstration, validation) • Geochemical oriented in-situ experiments • THM oriented in-situ experiments

  5. General - construction Example of stepwise approach: constructability • digging under protection of freezing (URL) • reconnaissance works in virgin clay (small diameter) • extrapolation to larger diameters and practical demonstration (test drift - MINE-BY test) • study of the interaction clay/lining considering • Concrete/shotcrete • cast-iron • sliding steel ribs (Andra) • study of hydro-mechanical disturbances (CLIPEX) • Study of the EDZ: fractures and self-healing (SELFRAC)

  6. Experiments first generation • MIGRATION processes, requiring the development of piezometer, using sintered metal filters • CORROSION mechanisms (glass, metal) • Heater test, requiring special attention for performance of heating elements and design studies (ATLAS) • Composition/performance of backfill/sealing materials (blocks, powder) e.g. BACCHUS and CACTUS* experiments • Water Chemistry in clays (ARCHIMEDE*) • Hydraulic transfer between clay and underground structures (PHEBUS*) (*) Andra projects

  7. Experiments second generation Development of larger scale integrated experiments, e.g • CERBERUS (1988/1996): study of effect on the near-field behaviour of a COGEMA HLW-canister after 50 years cooling time (-sources) • Later on, 3-D migration experiments (RN, gas) – MEGAS, PROGRESS • More recently, CORALUS (glass), RESEAL (seal plug using clay pellets)

  8. Coralus

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