Architecture and management of a geological repository - Andra

5 – Repository ModulesTo illustrate the possibilities in this area, one possible co-disposal scenario was defined, on the basis ofthe package inventory presented in chapter 3, complying on the one hand with the separationconstraints for certain package types and on the other with the geometrical constraints of standardisedpackages. This scenario therefore separates packages containing organic materials liable to releasecomplexing chemical species from the other packages. It keeps the bituminous waste (type B2packages) cells far enough away from the other cells to protect this waste from possible heating.Finally, it allows differentiated management of packages producing gases.This scenario is such that the height and the width 75 of all the disposal packages intended for codisposalin the same cell are identical, in order to minimise the volume of residual space around thedisposal packages, to avoid disrupting the longitudinal ventilation flow through the disposal chamberand to standardise handling. For the same reasons, the height and width of the disposal chamber areconstant over the entire length of the cell, as a result of standardisation of the disposal packages (seechapter 4).These considerations led to identification of 10 different types of cells. For example, Figure 5.1.21 is aschematic representation of 4 cell cross-sections of different dimensions, with the correspondingpackages.Figure 5.1.21Cell cross-sectionsFinally, the distances between the cells prevents interaction in the very long term. This in particularconcerns packages containing organic materials, for which the disposal cells are isolated from theother cells at this stage of the study. In the particular case of type B2 packages, this distance is enoughto maintain the temperature within the cell at below 30 °C (see chapter 6).75In the transverse direction of the cellDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM183/495