Architecture and management of a geological repository - Andra

Different instrumentation options are proposed for C control cells and also for the clay plug which sealthe cell. These options are also adapted where necessary to CU3 cells, whose reference design issimilar to that of the C0 cells. At the current state of studies, it has been decided not to place anysensors inside the useful part of the cell.10.3.8.1 The system of monitoring of a C control cellC cells are different from B cells, drifts and shafts in that they are not accessible during construction asa result of their small diameter. Also, the rapid installation of the steel sleeve prevents the fitting ofany monitoring equipment in the rock in the cell wall.The instrumentation envisaged for a C control cell is made up of several instrumented sectionsproviding specific measurements, fiber optics providing a temperature profile for the whole length ofthe cell, a cell atmosphere measurement system connected to its metal plug, and instrumented boreholesmade in the access drift parallel to the cell's axis (cf. Figure 10.3.14) and, if necessary, in theinterconnecting drift perpendicular to the cell's axis. A combination of these techniques offersflexibility and redundancy in the available means of investigative monitoring.Figure 10.3.14Monitoring equipment that can be used on a C control cellDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM408/495