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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

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


Framework
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


Overview of past and on going experiments in the hades url

EUROPEAN UNDERGROUND RESEARCH

INFRASTRUCTURE FOR DISPOSAL OF

NUCLEAR WASTE IN CLAY ENVIRONMENT


Content
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


General construction
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)


Experiments first generation
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


Experiments second generation
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)