Tome Architecture and management of a geological repository - Andra

4 - General architecture of the repository in a granite mediumFigure 4.4.1Diagram of the risk reduction devices envisaged for package transfer via ashaft• Risks of packages falling in the underground installationsAs on the surface, would a cask containing the package fall off from a moving carrier, there should beno radiological consequences because of the cask’s mechanical strength, the short potential dropheight and the carrier’s low travelling speed.As for the risk of dropping when the package is emplaced in the disposal cell, the analysis variesaccording to the package type in question. A number of simulations have been made to estimate theconsequences of a B waste package falling during emplacement in horizontal tunnels, and those of a Cwaste or spent fuel package at the time of insertion into a vertical shaft. These studies presented infuller detail in chapters 5 (B waste packages), 6 (C waste packages) and 7 (spent fuel), have notbrought to light any risk of breakage of these different waste packages.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY91/228