(GRS 207) Ventilation Test at Mont Terri: Geoelectric Monitoring

Tilmann Rothfuchs, Lothar Hartwig, Karsten Hellwald, Michael Komischke, Rüdiger Miehe, Klaus Wieczorek

The VE was a joint experiment performed by four partners of the Mont Terri project. The partners were the Spanish Empresa Nacional de Residuos Radiactivos (ENRESA) as project leader, the French Institut de Radioprotection et de Sûreté Nucléaire (IRSN), the Swiss Nationale Genossenschaft für die Lagerung radioaktiver Abfälle (NAGRA) and the GRS.Within the project GRS was responsible for the investigation of desaturation and resaturation of the Opalinus clay during the ventilation of a microtunnel simulating the ventilation of a nuclear repository in a geological clay formation. Detailed information is given about the layout of the measurement array, the measuring instrumentation, and the measurement results obtained between October 2002 and May 2004. Information about laboratory calibration measurements needed for further interpretation of the in situ measuring data is given as well.