Tome Architecture and management of a geological repository - Andra
Tome Architecture and management of a geological repository - Andra
Tome Architecture and management of a geological repository - Andra
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
5 – B waste <strong>repository</strong> zoneFigure 5.6.7Lifting the package to the deposition height <strong>and</strong> placing at its location5.6.4 Risks associated with B waste package emplacement in the cellIn spite <strong>of</strong> the safety systems planned, the risk <strong>of</strong> the package h<strong>and</strong>ling equipment catching fire or apackage dropping during emplacement (or future retrieval) cannot be ruled out. Such events would belikely to have radiological consequences if they were to affect the confinement maintenance function<strong>of</strong> the radioactive materials provided by the primary package(s). Simulations <strong>of</strong> such events have beencarried out as part <strong>of</strong> the <strong>repository</strong> studies for a clay medium [27]. They can be transposed to the<strong>repository</strong> in a granite medium as the trolley <strong>and</strong> waste packages would be identical 33 .5.6.4.1 Consequences <strong>of</strong> a fire <strong>of</strong> the h<strong>and</strong>ling trolleySimulation has been made <strong>of</strong> a fire breaking out on the h<strong>and</strong>ling equipment while emplacing adisposal package. The fire’s characteristics (power, duration) have been defined on the basis <strong>of</strong> anelectrically powered vehicle equipped with a thin heat shield between the motor compartment (the firesource) <strong>and</strong> the h<strong>and</strong>ling compartment. The package being considered for this case study is a B2package because its bituminous matrix is the most vulnerable to temperature rise.The simulation demonstrates that in these conditions, the disposal package envelope would be subjectto a maximum temperature <strong>of</strong> about 500°C, which would lead to the concrete suffering superficialflaking without bursting. The primary packages would be subjected to temperatures below 100°C forthe two most exposed primary packages <strong>and</strong> this would not damage their metal envelope or affect theirbituminised waste content. Their average temperature would only be about forty degrees (cf. Figure5.6.8).33The only difference would be the package h<strong>and</strong>ling height, which would be slightly higher in the granite medium disposal tunnels.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY148/228
Change language