Tome Architecture and management of a geological repository - Andra

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5 – B waste repository zoneThis envelope defines a volume inside of which the properties of the fractures meet the criteria laiddown during previous exploratory work, basically in the underground laboratory.In principle installation of the cells in this volume is validated for the most stringent criteria,concerning properties of minor fracturing that must be avoided by the disposal tunnels.The construction programme is carried out in several stages. The sequence of these works aims togradually acquire the elements needed to validate each arrangement.This works programme consists of:- Drilling boreholes, performing hydro-geological tests and geo-physical measurements betweenboreholes in the volume of the blocks. The distance between boreholes is adjusted to the desiredresolution when interpreting the geophysical measurements. It can be envisaged from currentlyavailable technologies, that the spacing between boreholes will be about fifty metres. Boreholelength is adjusted to the block dimensions to avoid intersecting its envelope.- The results of this work should allow accurate cell installation keeping a minimum distance ofabout one hundred metres between them, and a minimum distance of several tens of metres fromthe water-conducting faults. Thus a cell may be installed on a borehole or between two boreholes.- This arrangement may be confirmed by measurements in the boreholes either side of the cell tocomplete near-field characterisation, particularly its very low permeability.- Once the cell site has been determined, a small diameter exploratory drift is excavated in theborehole axis up to the planned end point. Final validation of the cell site is acquired bycomparing the minor fracturing on the walls against the criteria defined in the undergroundlaboratory.- When a cell is sited between two boreholes, a borehole may be drilled in the axis of theexploratory drift.- Cell qualification is finally acquired following detailed geological surveys of the fracturing carriedout on the excavation walls at the end of excavation work.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY140/228
5 – B waste repository zone-Figure 5.6.1Basic diagram of exploration and characterisation for a B waste module andcell5.6.2 Constructing a disposal cellDisposal cell excavation is carried out by the drill& blast method. However the implementation ofthis method must be based on suitable boring and blasting methods to limit damage to the rock at theexcavation wall.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY141/228
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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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4 - General architecture of the rep
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Page 106 and 107: 5 - B waste repository zone5.1.4 Ce
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Page 114 and 115: 5 - B waste repository zone5.2 Safe
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Page 128 and 129: 5 - B waste repository zone5.3.4.2
Page 130 and 131: 5 - B waste repository zoneOn the a
Page 132 and 133: 5 - B waste repository zonegeometri
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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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6 - C waste repository zoneFigure 6
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6 - C waste repository zoneCOMPONEN
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7 - Spent fuel repository zoneSpent
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7 - Spent fuel repository zoneMater
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7 - Spent fuel repository zone7.1.3
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7 - Spent fuel repository zoneA sin
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7 - Spent fuel repository zoneSwede
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7 - Spent fuel repository zone• E
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7 - Spent fuel repository zoneSKB
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7 - Spent fuel repository zoneFigur
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7 - Spent fuel repository zone7.6 D
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7 - Spent fuel repository zone• E
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7 - Spent fuel repository zoneevent
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88Conclusions8.1 Generic architectu
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8 - ConclusionsThe envisaged two-le
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Références bibliographiquesRefere
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Références bibliographiques[39] A
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Photo Credits:ANDRA - SKB - NAGRA -
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Tome Architecture and management of a geological repository - Andra

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