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Thermal Impact on the Damaged Zone Around a Radioactive Waste Disposal in Clay Host Rocks

Objective

In all nuclear power generating countries, spent nuclear fuel and long lived radioactive-waste management is an important environmental issue today. Disposal in deep clay geological formations is one of the promising options to dispose of these waste. An important item for the long-term safety of underground disposal is the proper evaluation of the Damaged Zone (DZ) in the clay host rock. The DZ is first initiated during the repository construction. Its behaviour is a dynamic problem, dependent on changing conditions that vary from open-drift period, to initial closure period, to the entire heating-cooling cycle of the decaying waste. Other factors concern the even longer-term issues of chemical reactions and biological activities. The TIMODAZ project will focus on the study of the combined effect of the EDZ (Excavation Damaged Zone) and the thermal impact. The influence of the temperature increase on the EDZ evolution as well as the possible additional damage created by the thermal load will be studied. Three types of clay will be investigated: the Boom Clay, the Opalinus Clay and the Callovo-Oxfordian argilite. To assess the impact of the different repository evolution stages on the host rock, numerical tools will be developed allowing a good prognosis of the THMC host rock behaviour at the time and spatial scale of a repository. These developments will build on an experimental programme including laboratory and in-situ tests. The knowledge gained within the project will allow an assessment of the significance of the TDZ (Thermal Damaged Zone) in the safety case for disposal in clay host rock and to provide direct feedback to repository design teams. In order to ensure appropriate and continuous linkage between the end-users' needs and the priorities of the project, an end-users' group that will be active throughout the duration of the project has been constituted. The end-user group will consist of mainly national agencies for management of radioactive waste.

Call for proposal

EURATOM-2005-6-FIXEDDEADLINE
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Funding Scheme

STREP - Specific Targeted Research Project

Coordinator

ESV EURIDICE GIE - EUROPEAN UNDERGROUND RESEARCH INFRASTRUCTURE FOR THE DISPOSAL OF WASTE IN A CLAY ENVIRONMENT
Address
Boeretang 200
Mol
Belgium

Participants (14)

NATIONALE GENOSSENSCHAFT FUER DIE LAGERUNG RADIOAKTIVER ABFAELLE
Switzerland
Address
Hardstrasse 73
Wettingen
STUDIECENTRUM VOOR KERNENERGIE - CENTRE D'ETUDE DE L'ENERGIE NUCLEAIRE
Belgium
Address
Herrmann Debrouxlaan 40-42
Bruxelles
GESELLSCHAFT FUER ANLAGEN- UND REAKTORSICHERHEIT (GRS) MBH
Germany
Address
Schwertnergasse 1
Koeln
NUCLEAR RESEARCH AND CONSULTANCY GROUP
Netherlands
Address
Westerduinweg 3
Postbus 25 Petten
CENTRE INTERNACIONAL DE METODES NUMERICS EN ENGINYERIA
Spain
Address
Edifici C1, Campus Nord Upc, Gran Capitan S/n
Barcelona
ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
Switzerland
Address
Ecublens
Lausanne
UNIVERSITE DE LIEGE
Belgium
Address
Place Du 20 Août 7
Liège
UNIVERSITE JOSEPH FOURIER GRENOBLE 1
France
Address
Avenue Centrale 621, Domaine Universitaire
Grenoble
ECOLE NATIONALE DES PONTS ET CHAUSSEES (ENPC)
France
Address
Avenue Blaise Pascal 6-8, Cite Descartes, Champs Sur Marne
Marne-la-vallee
CESKE VYSOKE UCENI TECHNICKE V PRAZE
Czechia
Address
Zikova 4
Praha 6
ITASCA CONSULTANTS S.A.S.
France
Address
Chemin Des Mouilles 64
Ecully
APPLIED SEISMOLOGY CONSULTANTS LTD
United Kingdom
Address
Brassey Road, Old Potts Way
Shrewsbury
ITC SCHOOL OF UNDERGROUND WASTE STORAGE AND DISPOSAL
Switzerland
Address
Postfach
Innertkirchen
SOLEXPERTS AG
Switzerland
Address
Mettlenbachstrasse 25
122 Moenchaltorf