Tome Architecture and management of a geological repository - Andra

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6 – C waste repository zoneFigure 6.6.7Basic diagram of barrel operationThe cask accommodation capacity (two packages and one plug) is such that a C1-C4 waste disposalborehole can be fully filled in a single shuttle trip. Package emplacement for cells that accommodatemore packages starts by removing the borehole radiological protection plug and storing it in the cask.The cycle ends by emplacing the radiological protection plug in the borehole.Dossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY188/228
6 – C waste repository zoneThe lifting system is equipped with the usual package drop safety devices provided in nuclearequipment design. For example a load lowering speed reducing device is envisaged in the event of amalfunction or break in the lifting drive train. Likewise, the package grappling arm is designed withinherent security and the fingers can only open if the load is put down.At the end of the cycle, the rotary table set at the position “closing the cask”, then the cask is undockedfor the return trip to the surface. The disposal borehole head protection device is put back in position.6.6.5 Risks associated with C waste package emplacement in the cellA package grasping grapnel malfunction may cause a package to drop during emplacement (orretrieval as the case may be) and despite the designed safety systems cannot be ruled outSpecific simulations [52] have been made on the basis of two scenarios: the first scenario correspondsto the first disposal package falling from the cask to the bottom of the disposal borehole, the second isthe second disposal package falling onto the top of the first disposal package. The height of 20 metresadopted for this study amply covers the planned disposal borehole heights as they will only be aboutten metres deep.The results obtained reveal that even with a drop height of 20 metres, the deformations would belimited to the disposal package envelope base. They are a little more severe in the first scenariostudied (direct drop of the package to the bottom of the borehole) than in the second. The C wasteprimary package itself is hardly affected by the impact in either case.Thus the risk of a C package falling during emplacement does not appear to be able to lead to thebreaking of a package with loss of confinement of radioactive material.6.6.6 Closing the structuresAs in the case of B waste (chapter 5), the closure of the C waste repository zone can be staged, whichprovides potential observation time between each stage. Each stage of the process can be managed withconsiderable flexibility. Reversing the process by backtracking to an earlier stage, as far as retrieving thepackages, is possible, even if it calls for the deconstruction of more substantial closure structures, as closureprogresses further.The successive closure stages for the disposal cells (see section 6.4.1), handling drifts, module or setof grouped modules, and disposal zone level call for the emplacement of backfill and seals that play acomplementary and redundant role.• Closure of the handling driftsThe closure of the drifts consists of removing the equipment from the structure, cutting a trench across theconcrete roadway, emplacing continuous low permeability compacted backfill between the cell heads and thestandard section of the drift, and constructing a concrete plug to confine the backfill mechanically.The composition of the low permeability backfill and their emplacement method in inclined andcompacted layers are described in chapter 3.1.4.A concrete plug constructed at the entrance to each handling drift mechanically confines the swellingof the clay fraction of the backfill. In the event of the closure of one single drift, the construction ofadditional plugs in the interconnecting drifts is considered. These plugs are installed in drift sectionswhere no cell has been constructed.Dossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY189/228
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The present English version is a tr
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Contents4.1 Surface installations..
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Contents7.2.1 Harnessing the favour
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ContentsFigure 5.1.7 Non-alloy stee
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ContentsFigure 7.6.3 CU package emp
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11Study approach1.1 The main stages
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1 - Study approachSome studies were
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1 - Study approachIn France spent f
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2 - High-Level and Long-Lived waste
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3 - Design study of a repository in
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44General architecture of thereposi
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5 - B waste repository zoneThis cha
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5 - B waste repository zoneproduced
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5 - B waste repository zoneFigure 5
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5 - B waste repository zonerepaired
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5 - B waste repository zone5.1.4 Ce
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5 - B waste repository zonein the o
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5 - B waste repository zoneThe pack
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5 - B waste repository zoneTable 5.
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5 - B waste repository zone5.2 Safe
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5 - B waste repository zone• Inst
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5 - B waste repository zoneConcrete
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5 - B waste repository zone5.3.3 Co
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5 - B waste repository zonelinked t
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5 - B waste repository zone5.3.4.2
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5 - B waste repository zoneOn the a
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5 - B waste repository zonegeometri
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5 - B waste repository zoneTable 5.
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5 - B waste repository zoneLinéair
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Page 156 and 157: 5 - B waste repository zoneDossier
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Page 174 and 175: 6 - C waste repository zone6.3.3.2
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Page 198 and 199: 7 - Spent fuel repository zone7.1.3
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Page 225 and 226: Références bibliographiquesRefere
Page 227 and 228: Références bibliographiques[39] A
Page 229 and 230: Photo Credits:ANDRA - SKB - NAGRA -
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Tome Architecture and management of a geological repository - Andra

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