Architecture and management of a geological repository - Andra

2 – General DescriptionFigure 2.4.9Sealed spent fuel disposal cell2.4.3 Overall configuration of the underground installationsThe disposal cells for the various categories of waste are organised in an overall architecture. Thisarchitecture comprises various levels formed by (i) the independent repository zones for the variouscategories of waste, (ii) groups of disposal cells illustrating the gradual construction of these zones,and (iii) the actual disposal cells.Furthermore, the architecture comprises shafts and connecting drifts: these structures provide access tothe repository modules for the purpose of construction in the first instance, followed by transport ofthe waste packages, observation and, if the decision is taken, closure.2.4.3.1 Shafts and connecting driftsA series of four shafts links the surface installations to the repository level in the geological formationstudied (these shafts are described in detail in chapter 7):- a personnel transfer shaft, dedicated to the transfer of personnel and small equipment, and to theinflow of fresh air into the underground installations;- a construction shaft dedicated to the transfer of crushed rock, backfill, other materials andequipment. This shaft also forms an air inlet;- a shaft specially allocated to the transfer of disposal packages (placed in radiation protectiontransfer casks) and empty transfer casks;- an exhaust shaft for the air extracted from the underground installations.- As a variant, a ramp is conceivable for construction, rescue or package transfer functions.The repository modules can be accessed from the shafts via a set of structured connecting drifts. Toenable waste package emplacement activities and new module construction activities to coexist safely,the connecting drifts are allocated to specific functions:DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM65/495