Tome Architecture and management of a geological repository - Andra

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6 – C waste repository zone6.6 Disposal process as part of the reversibility rationale6.6.1 Installation of the disposal cellsIn the same way as for the B waste repository tunnels, the detailed exploratory work of a C wastemodule host block is carried out in stages (Figure 6.6.1), as excavation work progresses..This program aims at defining:- the position of the handling drifts on the basis of horizontal boreholes drilled from a driftaccessing to the block and of geophysical measurements between boreholes;- the layout of disposal boreholes using geological surveys at the handling drift walls, short verticalboreholes and geophysical and hydro-geological measurements;- cell qualifications on the basis of geological surveys of the wall and additional measurementscarried out in the disposal boreholes.At each exploration stage, the information gathered is compared to the criteria as defined throughunderground laboratory studies and safety analyses.Through these comparisons, module architecture is gradually adjusted to the characteristics of thegranite in the block and disposal cell qualification rate by module can be managed.6.6.2 Construction of the connecting and handling driftsAs for B waste module connecting drifts, full section excavation by drilling and blasting is taken as thereference method. Likewise the use of low-damage techniques such as "smooth blasting", is envisagedin the vicinity of the future module seal sites.Two excavating techniques can be envisaged for the handling drifts:- drilling and smooth blasting;- a combination of mechanical excavating techniques using a tunnel boring machine (TBM) in thehandling drifts and smooth blasting for the interconnecting drifts.At this stage excavating with explosives has been taken as the reference method because it offersgreater flexibility with today’s proven techniques. This method is the same as the one adopted by SKBfor their spent fuel disposal borehole design: KBS-3V. This choice is based on results of the APSEexperiment, which has demonstrated that it is possible to limit the development of a damaged zone toabout thirty centimetres through blasting pattern adjustments.Dossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY182/228
6 – C waste repository zoneFigure 6.6.1Basic surveying programme for cell installationDossier 2005 granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY183/228
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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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Page 150 and 151: 5 - B waste repository zonePosition
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Page 154 and 155: 5 - B waste repository zoneTable 5.
Page 156 and 157: 5 - B waste repository zoneDossier
Page 158 and 159: 6 - C waste repository zone66 C was
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Page 174 and 175: 6 - C waste repository zone6.3.3.2
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Page 225 and 226: Références bibliographiquesRefere
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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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