Architecture and management of a geological repository - Andra

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5 – Repository ModulesFigure 5.2.14 illustrates the different package spacings in the cells according to their heat rating.Figure 5.2.14C cell longitudinal cross-sectionsIt should be noted that the temperature evolution on the cell wall between 0 and 600 years, at thehottest point in the argilite (Figure 5.2.15), shows a dip below the 70°C threshold well before1,000 years, thus ruling out any risk of mineralogical transformation of the argilite.Température (C°)908070605040Alvéole C3Alvéole C4Alvéole C1/C2Alvéole CO300 40 80 120 160 200 240 280 320 360 400 440 480 520 560 600Nombre Number d'années of years aprés after la mise disposal en stockageFigure 5.2.15Cell wall temperature for C waste (hottest point in the argilite)DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM210/495
5 – Repository ModulesSensitivity to uncertainties in the input data.Apart from the design elements aimed at helping dissipate heat (package and steel sleeve), thefollowing main parameters influence the temperature peak:- the thermal properties of the geological medium (Callovo-Oxfordian argilites),- the presence or absence of a functional clearance between the sleeve and the geological medium 78 .Uncertainties regarding these parameters were approximated through various sensitivity calculations.These show an increase or reduction in the temperature peak of about +/- 10°C. Adopting 90°Cdimensionning ensures that the rock temperature does not exceed 100°C taking the uncertainties intoaccount.The consequences of these deviations can be assessed in terms of the impact on the packagepreliminary storage period. The resulting storage period variation for "earliest possible" disposal isabout +/- 10 years.• Conclusion concerning thermal designThe dimensions of the C waste repository modules are primarily the result of the thermal design. Thisdetermines the number of packages per cell and the inter-axial distance between cells. However, thereis room for optimisation if the feasibility of longer cells can be demonstrated, both in terms of theirconstruction and from the package handling viewpoint. This avenue of optimisation has yet to beexplored at this stage in the studies.5.2.3.4 Mechanical and thermomechanical design of the access drift - disposal cell systemThe mechanical and thermomechanical design is intended to ensure the integrity of the access drift –disposal cell system structure and functional clearances during a minimum secular period. It concernsthe thickness of the disposal cell sleeve and the characteristics of the access drift concrete lining.• Disposal cell sleeve calculationsThe following phenomena may affect the sleeve's integrity in the long term:- Argillite creep filling the annular cavity on the sleeve extrados and producing radial compressionstress around the sleeve. The radial compression stress value at a given data depends on theargillite creep rate and the initial dimensions of the annular space. The creep rate is itselfdependent on the argillite temperature.- Terrain expansion (due to the exothermicity of the packages), producing a supplementary radialcompression stress in the absence of clearance. This stress increases during the first decades andthen decreases once the temperature peak has been passed.- Expansion differential between steel and argillite (due to the exothermicity of the waste) which,combined with the lateral friction stresses due to argillite creep, induces an axial compressionstress in the sleeve. This phenomenon undergoes a time evolution similar to terrain expansion.Sleeve steel corrosion (its thickness includes a 5 mm corrosion allowance).Quantification of radial load stressesGiven the uncertainties concerning the initial dimensions of the annular space and the kinetics of thevarious phenomena involved, it has been decided to dimension the sleeve thickness for a 12 MPa load,corresponding to the initial geostatic stress of the geological medium.78The thickness of the functional clearances is not as important as the number of clearances located between the package and thegeological medium. The difference in temperature caused by the air gap between two cylinders is hardly affected by the thickness ofthis gap between one and several cmsDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM211/495
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Report SeriesTomeArchitectureand ma
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C.RP.ADP.04.00013/495ContentsConten
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C.RP.ADP.04.00015/4955.3.2 Design p
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C.RP.ADP.04.00017/4959.2.3 The tran
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C.RP.ADP.04.00019/495Bibliographic
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C.RP.ADP.04.000111/495Table of illu
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C.RP.ADP.04.000113/495Figure 4.3.8
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C.RP.ADP.04.000115/495Figure 5.3.9F
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C.RP.ADP.04.000117/495Figure 9.2.2
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C.RP.ADP.04.000119/495Figure 10.4.8
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C.RP.ADP.04.000121/495Table 11.6.1T
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1 - The Study Approach1.1 Purpose o
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1 - The Study ApproachFrom 1999 to
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1 - The Study Approach1.4 Structure
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2 - General DescriptionThis chapter
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2 - General DescriptionHLLL waste p
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2 - General DescriptionFor a transi
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2 - General DescriptionIt should al
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2 - General Description2.2.2.2 Safe
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2 - General DescriptionThe protecti
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2 - General DescriptionIt should al
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2 - General DescriptionThis section
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2 - General Descriptionfollowing th
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2 - General Description2.3.2.2 Geoc
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2 - General DescriptionFigure 2.3.5
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2 - General DescriptionIn the Dogge
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2 - General Description• A dimens
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2 - General Description2.4.1.2 Desi
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2 - General Description- some conne
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2 - General DescriptionAs for the w
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2 - General DescriptionThe figure b
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33High-level long-lived waste3.1 Wa
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3 - High Level Long-Lived WasteRese
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3 - High Level Long-Lived Wastesupp
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3 - High Level Long-Lived WasteThe
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3 - High Level Long-Lived WasteFigu
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3 - High Level Long-Lived WasteA fi
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3 - High Level Long-Lived WasteA se
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3 - High Level Long-Lived WasteVitr
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3 - High Level Long-Lived WasteCond
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3 - High Level Long-Lived WasteDist
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3 - High Level Long-Lived Waste3.3.
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3 - High Level Long-Lived WasteTabl
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44Waste disposal packages4.1 B disp
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4 - Waste disposal PackagesFor empl
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4 - Waste disposal Packages• Safe
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4 - Waste disposal Packages• "Par
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4 - Waste disposal PackagesThe prin
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4 - Waste disposal PackagesThe seco
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4 - Waste disposal PackagesFigure 4
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4 - Waste disposal Packages4.1.5 Th
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4 - Waste disposal Packages4.1.5.7
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4 - Waste disposal PackagesIn the c
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4 - Waste disposal PackagesFinally,
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4 - Waste disposal PackagesThe YAG
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4 - Waste disposal PackagesIn the U
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4 - Waste disposal PackagesThe spee
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4 - Waste disposal Packages4.2.4 Ma
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4 - Waste disposal PackagesLoadSlid
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4 - Waste disposal Packages4.3 Spen
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4 - Waste disposal PackagesThe seco
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4 - Waste disposal PackagesFor both
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4 - Waste disposal Packages• Safe
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4 - Waste disposal PackagesAs for C
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4 - Waste disposal PackagesMelted c
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Page 191 and 192: 5 - Repository Modules• Limiting
Page 193 and 194: 5 - Repository Modules5.2.2 Design
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7 - The shafts and the driftsThe co
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7 - The shafts and the drifts7.2.2
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7 - The shafts and the driftsFigure
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7 - The shafts and the drifts7.3.3.
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7 - The shafts and the drifts7.4 De
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7 - The shafts and the driftsThe dr
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7 - The shafts and the drifts7.7 Cl
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7 - The shafts and the driftspressu
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88Surface installations8.1 General
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8 - Surface installationsFigure 8.1
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8 - Surface installationsSuch a bui
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8 - Surface installationsApart from
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9 - Nuclear operating resources in
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1010 Reversible repositorymanagemen
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During the operational phase, the d
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Figure 10.1.1Key repository operati
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The radioactive elements can thus b
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Furthermore, equipment and liner ma
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The condition of the access drifts
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The sleeve’s durability is improv
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10.2.2.2 “Post cell-sealing” st
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As far as long-term safety is conce
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Figure 10.2.10Diagrammatic represen
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10.3.1.1 Overview of the principal
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10.3.2.2 Monitoring of type C waste
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The project’s monitoring programm
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• Absence of a significant impact
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Dams are of particular interest whe
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The rate of operation of these sens
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• Water contentThe water content
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A similar wireless transmission tec
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Figure 10.3.9Example of monitoring
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In addition, a visual control syste
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Cell atmosphere monitoring is limit
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The monitoring of the seal can be c
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• The instrumented sections and t
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The deformation measurements carrie
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10.3.9 Observation of spent fuel di
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These instrumented sections (cf. §
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The monitoring equipment embedded i
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the cell which conditions the evolu
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Figure 10.4.2Cell filled with B pac
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Ventilation of a 250-m long cell re
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• Package retrieval processOnce t
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Figure 10.4.10C Cell at end of oper
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The robot is traversed similarly to
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This operation is complete when a b
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The condition of the drift liner sh
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1111 Operational Safety11.1 Evaluat
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11 - Operational SafetyTransport tr
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11 - Operational SafetyTable 11.1.1
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11 - Operational SafetyResultsTable
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11 - Operational SafetyThe risks ar
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11 - Operational SafetyOn the surfa
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11 - Operational Safety“Honeycomb
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11 - Operational SafetyGiven the me
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11 - Operational SafetyThis risk co
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11 - Operational SafetyHydrogen emi
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11 - Operational SafetyOver and abo
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11 - Operational SafetyFigure 11.4.
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11 - Operational SafetyHowever, wit
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11 - Operational Safety11.5.2 Concl
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11 - Operational Safety11.7.1 Asses
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11 - Operational SafetySuch a damag
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11 - Operational Safety11.8.1.2 Dat
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11 - Operational SafetyIn all cases
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1212 Synthesis12.1 Simple and robus
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12 - SynthesisThe existence of unce
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12 - SynthesisTo concretely illustr
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Bibliographic references[17] Callon
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Bibliographic references[54] Andra
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Bibliographic references[88] IAEA (
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Photo Credits:ANDRA - AREVA CREATIV
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Architecture and management of a geological repository - Andra

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