Architecture and management of a geological repository - Andra

5 – Repository ModulesFigure 5.1.26Radiological protection shield (plan view)During and after installation of this shield, the cell can continue to be normally ventilated. Once theradiological protection shield is in place, removal of the equipment on the cell head can begin, whileretaining the benefits of cell ventilation.Before filling the cell head, the ventilation ducts locating in the cell lining are filled with concreteslurry. The concrete is then poured in bulk into the cell head and thus constitutes the retaining plug forthe clay core. Absorptive formwork on the upstream side is used to separate the radiological protectionshield from the filler concrete, so that the latter can be removed in the event of the package beingretrieved.The subsequent steps are identical to those for sealing the drift, as described in section 7.6.5.2 C waste repository modulesThis section first of all describes the objectives pursued in the design of the C waste disposal cells. Itpresents the various solutions envisaged, the general principles currently adopted and, for comparison,the concepts being examined abroad.It then presents a description of the cell, the access drift and their equipment. The layout of the cellswithin a module is also described. The design values are justified according to the functions to beperformed: safety functions, operational functions concerning package emplacement and reversibility.The safety functions in particular consist in limiting the mechanical damage to and heating of theargilite and minimising the circulation of water.The construction processes are then described. In the feasibility study, the design of a component is ineffect inseparable from its construction processes. However, in many cases, a number of processes canbe envisaged: the description concentrates on whichever of them appeared to be most appropriate atthis stage in the studies.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM189/495