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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


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)



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