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Processes of Cation Migration in Clayrocks

Processes of Cation Migration in Clayrocks

Objective

The overall objective of CatClay is to provide a scientifically well grounded answer to the following question: Can the migration of actinides and other strongly sorbing radionuclides in clayrock be predicted by coupling models of (i) their sorption equilibria on representative clay minerals and (ii) the diffusion-driven mass transport of radionuclide sorbed and dissolved species in compacted masses of these clay minerals? The answer is of prime importance for Safety Cases for clayrock formation-based radioactive waste disposal concepts. The project takes as its starting point experimental observations showing that certain cations known to form highly stable surface complexes with sites on mineral surfaces, migrated more deeply into clayrock than expected. This suggests that current models may not be correct for these cations. CatClay calls upon a number of innovative approaches. It provides i) high resolution experimental methods leading to high quality, low analytical uncertainty data sets, ii) innovative conceptual, and corresponding numerical, models in order to represent the coupled diffusion-sorption behavior of surface complexing radionuclide. CatClay is structured along 3 RTD workpackages, combining modeling and experimental studies from the simpler, analogous system (clay) to real materials (clayrocks). The sorption-diffusion behavior of 3 cations will be studied selected according to their known differences in sorption reactions with clay mineral surfaces. CatClay combines the forces of 5 research institutions having proven expertise in experimentally studying and modelling the above described processes; the developer of a widely used coupled transport code; one waste management organisation for the application to safety case. The transfer of knowledge to a broader community, scientists and end-users, is also done through publication in peer reviewed journals and publically-available reports.

Coordinator

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Address

Rue Leblanc 25
75015 Paris 15

France

Activity type

Research Organisations

EU Contribution

€ 183 715

Participants (6)

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AGENCE NATIONALE POUR LA GESTION DES DECHETS RADIOACTIFS

France

EU Contribution

€ 37 113

BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES

France

EU Contribution

€ 127 550

PAUL SCHERRER INSTITUT

Switzerland

EU Contribution

€ 166 000

STUDIECENTRUM VOOR KERNENERGIE / CENTRE D'ETUDE DE L'ENERGIE NUCLEAIRE

Belgium

EU Contribution

€ 158 600

KARLSRUHER INSTITUT FUER TECHNOLOGIE

Germany

EU Contribution

€ 74 520

Dr C.A.J. Appelo

Netherlands

EU Contribution

€ 72 000

Project information

Grant agreement ID: 249624

Status

Closed project

  • Start date

    1 June 2010

  • End date

    31 May 2014

Funded under:

FP7-EURATOM-FISSION

  • Overall budget:

    € 1 549 336,40

  • EU contribution

    € 819 498

Coordinated by:

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

France