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Architecture and management of a geological repository - Andra

Architecture and management of a geological repository - Andra

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5 – Repository ModulesFigure 5.1.7Diagram <strong>of</strong> the concept adopted by NAGRA (Switzerl<strong>and</strong>)In Belgium, the concept adopted by ONDRAF 63 consists in placing “monoliths” (concrete disposalpackages containing several primary packages) in drifts with a diameter adjusted to the diameter <strong>of</strong> themonoliths, that is, 3 to 4.5 m (Figure 5.1.8). The aim <strong>of</strong> this small excavated diameter is to adapt to theproperties <strong>of</strong> the Boom clay, which is more clayey <strong>and</strong> much more plastic than the argillites <strong>of</strong>Meuse/Haute-Marne. The emplacement clearances between the monolith <strong>and</strong> the drift lining areminimized; they do not require filling.Figure 5.1.8Diagram <strong>of</strong> the concept adopted by ONDRAF (Belgium)In Japan, the concept adopted for a generic sedimentary site is a tunnel <strong>of</strong> circular cross-section with auseful diameter <strong>of</strong> 10 m. The space between the packages <strong>and</strong> the tunnel lining is filled in afterpackage emplacement. Several kinds <strong>of</strong> material are considered[60].63 National Agency for Radioactive Waste <strong>and</strong> Enriched Fissile MaterialsDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM170/495

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