Architecture and management of a geological repository - Andra

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11 – Operational SafetyFigure 11.7.13D representation of the lower section of the shaft equipped with the fall shockabsorber systemDOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM472/495
11 – Operational Safety11.7.1 Assessment of the mechanical consequences of a cage falling in a shaftThis assessment was made for the following B, C waste and spent fuel disposal packages (cf. Table11.7.1).Table 11.7.1Main data related to the studied cases of a fall in a shaftPrimary packageB2.1 : bituminised sludge181CSD-V : vitrified wasteCU1 183 : spent fuelassemblies11.7.1.1 Fall scenarioDisposal packageConcrete package 182 (with4 primary packages in verticalposition)Metallic over-pack(with a CSD-V container inhorizontal position)Metallic container (with 4 spentfuel assemblies in horizontalposition)Transfer transfer cask(load weight)Parallelopiped transfer cask(approx. 40 t)Cylindrical transfer cask(approx. 50 t)Cylindrical transfer cask(approx. 100 t)The imagined scenario is that of the cage in free fall 184 over the entire height of the shaft, which wouldimpact on a fall shock absorber system placed at the shaft bottom 185 .This scenario, which is overestimating for the fall height, doesn’t take into account :- An action of the cage anti-fall system,- The possible braking effect due to a rubbing or a jamming of the cage’s suspension cables duringthe fall,- The effect of the end-of-travel braking stop at shaft bottom.11.7.1.2 Data related to the simulation studiesThe numerical simulation approach 186 is split into steps where the fall’s consequences on the cage, thetransfer cask, the disposal package and the primary package(s) transported are successively quantified.The condition of each element of these objects at the end of the fall is characterised by its plasticdeformation, which corresponds to the cumulative total of all the types of deformations undergone(expansion, deformation, …). The corresponding coefficient expressed in % can be compared to theacceptable characteristic value (VCA) of the material making up this element. The risk of breakage isanalysed versus the values of the deformation coefficient and the location, shape and extension of thedeformed zone.181 The B2.1 disposal package was retained to represent the family of B waste packages because it corresponds to the most fragile primarypackage (metallic container of small thickness).182 For the simulation, the characterictics of the fiber reinforced concrete package without rod reinforcement have been used, as this packageis more vulnerable to the effect of a drop than the package made of rod reinforced concrete.183 The CU1 packages (UOx), which contain several assemblies, appear mechanically more fragile with respect to the risk of a fall than theCU2 package (MOx), which contains only one assembly.184 In this scenario, the breaking of the cage suspension cables has also as a consequence the fall of the counterweight over about fiftymetres down to the shaft bottom.185 Several technical elements condition the sizing of the shock absorber : the highest weight transported, the limitation of the decelerationof the transfer cask to a value not causing major mechanical damage, the limitation of the crushing of the shock absorber to half itsheight. In order to minimise the effect of the impact on the moving body, it is also planned to use a fall shock absorber with an upperstage having a crushing threshold less than that of the lower stage so that it operates in the most progressive possible way.186 The fall simulation studies were carried out with the software Radioss, which allows studying by finite elements any strongly non linearbehaviour of a structure subjected to forces from almost static up to rapid dynamic forces. Radioss temporally integrates the non lineardynamic equations by an explicit approach.DOSSIER 2005 ARGILE -ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL DISPOSAL SYSTEM473/495
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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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55Repository modules.5.1 B waste re
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5 - Repository Modules5.1.1.1 Quest
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5 - Repository Modules• Controlli
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5 - Repository ModulesFigure 5.1.1t
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5 - Repository Modules• The geome
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5 - Repository ModulesTable 5.1.1Fu
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5 - Repository ModulesFigure 5.1.9D
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5 - Repository Modules5.1.3.2 Detai
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5 - Repository Modules• Arrangeme
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5 - Repository ModulesAlthough this
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5 - Repository ModulesConnection be
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5 - Repository ModulesFurthermore,
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5 - Repository ModulesTo illustrate
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5 - Repository Modules• The acces
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5 - Repository ModulesFigure 5.1.24
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5 - Repository Modules• Limiting
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5 - Repository Modules5.2.2 Design
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5 - Repository ModulesA concept wit
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5 - Repository Modules• Orientati
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5 - Repository ModulesFigure 5.2.3O
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5 - Repository Modules5.2.3.1 Descr
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5 - Repository ModulesA minimum ann
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5 - Repository ModulesIn terms of t
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5 - Repository ModulesStorage perio
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5 - Repository ModulesSensitivity t
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5 - Repository ModulesIt must be no
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5 - Repository Modules• Disposal
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5 - Repository Modules• Assembly
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5 - Repository ModulesThe permeabil
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5 - Repository ModulesThe evolution
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5 - Repository ModulesThe lowest dr
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5 - Repository Modules• Back-fill
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5 - Repository Modules5.3.2.1 Sever
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5 - Repository ModulesFigure 5.3.4S
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5 - Repository ModulesThe cells are
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5 - Repository ModulesFinally, it s
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5 - Repository ModulesThe internal
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5 - Repository Modules• Descripti
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5 - Repository Modules- another pos
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66 Overall undergroundarchitecture6
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6 - Overall underground architectur
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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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Page 435 and 436: 1111 Operational Safety11.1 Evaluat
Page 437 and 438: 11 - Operational SafetyTransport tr
Page 439 and 440: 11 - Operational SafetyTable 11.1.1
Page 441 and 442: 11 - Operational SafetyResultsTable
Page 443 and 444: 11 - Operational SafetyThe risks ar
Page 447 and 448: 11 - Operational SafetyOn the surfa
Page 449 and 450: 11 - Operational Safety“Honeycomb
Page 451 and 452: 11 - Operational SafetyGiven the me
Page 453 and 454: 11 - Operational SafetyThis risk co
Page 455 and 456: 11 - Operational SafetyHydrogen emi
Page 457 and 458: 11 - Operational SafetyOver and abo
Page 459 and 460: 11 - Operational SafetyFigure 11.4.
Page 463 and 464: 11 - Operational SafetyHowever, wit
Page 469 and 470: 11 - Operational Safety11.5.2 Concl
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Page 477 and 478: 11 - Operational SafetySuch a damag
Page 479 and 480: 11 - Operational Safety11.8.1.2 Dat
Page 481 and 482: 11 - Operational SafetyIn all cases
Page 483 and 484: 1212 Synthesis12.1 Simple and robus
Page 485 and 486: 12 - SynthesisThe existence of unce
Page 487: 12 - SynthesisTo concretely illustr
Page 490 and 491: Bibliographic references[17] Callon
Page 492 and 493: Bibliographic references[54] Andra
Page 494 and 495: Bibliographic references[88] IAEA (
Page 496 and 497: Photo Credits:ANDRA - AREVA CREATIV
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