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Full-scale engineered barriers experiment in crystalline host rock

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OBJECTIVES
1. Firstly to demonstrate the feasibility of handling and construction of the EBS components, including industrial manufacturing of highly compacted bentonite, quality assurance and system monitoring. It is also expected to gain experience and develop standards for the waste disposal techniques by the observation of the EBS during dismantling. 2. Secondly, the project seeks to study the thermo-hydro-mechanical processes in the near field, mainly in the buffer material as well as develop, verify and partially validate existing codes and constitutive relations. 3. Thirdly, the identification and modelling of alteration processes in the buffer including gas generation and transport, is also pursued. PROPOSAL CONTENT
The proposal complies with the CEU programme Workplan. The aim is to install in a 2.40 m diameter new drift at the Grimsel Test Site (Switzerland) two heaters 0.90 m in diameter and 4.54 m in length. The annular space between the heaters and the drift surface will he backfilled with highly compacted bentonite blocks. The drift will be sealed with a 5 meters long concrete plug. Temperature water content total pressure, pore pressure and displacements will be monitored by adequate sensors installed in the buffer and near field rock. The sealed part of the drift will be about 18.00 m long; 25 to 30 additional meters of drift will be required to install the on site control and monitory system. Another remote system will allow to control and monitor the experiment from Madrid (Spain) .
Design, installation, heating, dismantling and integrated final analysis will take ahout 7 years. In the 3 years period covered by the CEU programme, design, installation partial heating and analysis will he achieved.
Prior to the "in situ" experiment, a mock-up test at almost 1:1 scale will be pertolmed. Also two heaters, 0.30 m in diameter and 1.64 m in length, surrounded by bentonite blocks, will he confined within a metallic cylinder of 1.60 m diameter and 6.00 m long, with a hydration system. The sensors and monitory systems will he similar to those of the "in situ" test. Laboratory test will be run for rock and buffer characterization for determination of the modelling parameters. "Ad hoc" oedometer and triaxial tests with controlled suction and temperature will also he performed in order to verity and partially validate codes and constitutive laws for unsaturated swelling clays. The existing codes and constitutive laws will be further developed during the testing period.
In the body of the proposal the milestones and deliverables, partners of the project management structure and other items required are shown.

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EMPRESA NACIONAL DE RESIDUOS RADIOACTIVOS S.A.
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7,Emilio Vargas 7
28043 MADRID
Spanien

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Letzte Aktualisierung: 2 April 1996

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Permalink: https://cordis.europa.eu/project/id/FI4W950006/de

European Union, 2024