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A large scale in situ demonstration test for repository sealing in an argillaceous host rock - phase II

Objective

An essential item for the long-term safety of high-level waste underground repositories is the backfilling and sealing of access shafts and connection galleries. The main objective of RESEAL II is to demonstrate on a representative scale that the sealing of a shaft i.e. the "experimental" shaft of the HADES underground laboratory, with a low permeability powder/pellets mixture of bentonite avoids preferential migration of water, gas or radionuclides either through the seal of through the excavation disturbed zone around it. The mechanical stability of the seal under accidental overpressure conditions will be also tested. A tracer diffusion in the host clay formation around the seal will allow to study, by modelling, the migration parameters of the excavation disturb ed zone. Hydro-mechanical models will be applied for the interpretation of the test results and consequently to demonstrate our understanding of the seal behaviour.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

BELGIAN NUCLEAR RESEARCH CENTRE
Address
200,Boeretang 200
2400 Mol
Belgium

Participants (4)

CENTRO DE INVESTIGACIONES ENERGETICAS, MEDIAMBIENTALES Y TECNOLOGICAS
Spain
Address
22,Avenida Complutense 22
28040 Madrid
COMMISSARIAT A L'ENERGIE ATOMIQUE
France
Address
Centre D'etudes De Saclay
91191 Gif Sur Yvette
NATIONAL RADIOACTIVE WASTE MANAGEMENT AGENCY OF FRANCE
France
Address
Rue Jean Monnet 1-7
92298 Chatenay Malabry
UNIVERSITAT POLITECNICA DE CATALUNYA
Spain
Address
S/n,jordi Girona 1-3, Modul D2, Campus Nord
08034 Barcelona