Mass Transfer & Porous Media (MTPM) - Andra

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P/<strong>MTPM</strong>/33Clay modellingPore size distributionDe=f(clay, pore water) %i600 mEffective diffusioncoefficientCartographie minérale(Microsonde LIBS, MEB)DeArgiliteDe (HTO)Figure 1: Up-scaling method.References:[1] F. Goutelard, N. Diaz “How to define the major parameters controlling diffusion behaviour of anionicspecies in clayey rock ? The use of an Experimental design” submitted to Journal of ContaminantHydrology.[2] Menut, D., Descostes, M., Meier, P., Radwan, J., Mauchien, P., Poinssot, C. Europium Migration inArgilaceous Rocks: On the Use of Micro Laser-Induced Breakdown Spectroscopy (Micro LIBS) as aMicroanalysis Tool, in Scientific Basis for Nuclear Waste Management XXIX (Mater. Res. Soc. Symp.Proc. 932), 141. (2006)Page 488INTERNATIONAL MEETING, SEPTEMBER 17...>...18, 2007, LILLE, FRANCECLAYS IN NATURAL & ENGINEERED BARRIERSFOR RADIOACTIVE WASTE CONFINEMENT
P/<strong>MTPM</strong>/34NUMERICAL MODELLING OF COUPLEDMECHANICS AND GAS TRANSFERP. Gerard 1 , R. Charlier 1 , J.-D. Barnichon 2 , J.-F. Shao 3 , G. Duveau 3 , D. Hoxha 4 ,C. Chavant 5 , F. Collin 11. Université de Liège, département ArGEnCo, Chemin des Chevreuils 1, 4000 Liège, Belgium( pgerard@ulg.ac.be , Robert.Charlier@ulg.ac.be , F.Collin@ulg.ac.be )2. ANDRA, ( jean-dominique.barnichon@andra.fr)3. Université de Lille ( jian-fu.shao@polytech-lille.fr , gillesduveau@yahoo.fr)4. INPL ( dashnor.hoxha@ensg.inpl-nancy.fr )5. EDF ( clement.chavant@edf.fr )INTRODUCTIONDuring long-term storage of high-level nuclear waste, steel containers will be corroded and some organicmaterial will be irradiated. The two processes lead to hydrogen production. This paper deal with thenumerical modelling of the gas migration and of it’s coupling with the mechanical strains and stresses.The basic equations are recalled. They concern the water transfer, the gas transfer, and the mechanicalequilibrium. The storage of water and gas are related to fluid state equation and to porosity changes,including the Biot effective stress, dissolved gas in liquid, water vapour. Perfectly rigid rock, elastic rockand elastoplastic rock cases are compared.A benchmark exercise has been proposed. Two steps are considered. They refer to a waste disposal in clay,but the disposal geometry is highly simplified. First a simple 1D radial problem is considered: a gallery of0.35m radius is drilled. Then the state of stress and the water transfers evolve freely during 2 years.Eventually a gas production is considered during 100 000 years. Three different finite element codes(LAGAMINE, MPPSAT and ASTER) have been used and give very similar results, what is a validationof these codes. Secondly a 2D axisymetric case in modelled (figure 1). Different material properties arehere concerned.The results show that transport of gas in dissolved phase is the most important phenomenon. The waterboundary condition plays also an important role. This remains an open question (Gerard et al, 2007). Thegas degree of saturation is very low and may induce some numerical difficulties. A classical way toL*HRemblairR1Vide : épaisseureR2ZBouchonde bétonBouchond’argileColisLa Lb Lc Ld/2Figure 1: 2D case – geometry.INTERNATIONAL MEETING, SEPTEMBER 17...>...18, 2007, LILLE, FRANCECLAYS IN NATURAL & ENGINEERED BARRIERSFOR RADIOACTIVE WASTE CONFINEMENTPage 489
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Poster [MTPM]Mass Transfer & Porous
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P/MTPM/1The free energy cost of for
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P/MTPM/3DIFFUSION OF IONS IN UNSATU
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P/MTPM/4POROUS MEDIA CHARACTERIZATI
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P/MTPM/5Oxalate ionsQuartzQuartz +P
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P/MTPM/6borehole was capped with a
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P/MTPM/7Initial state with glass an
Page 18 and 19: P/MTPM/8The mesh of the elementary
Page 20 and 21: P/MTPM/9Moreover, using another sam
Page 22 and 23: P/MTPM/10Figure 1: Horizontal cross
Page 24 and 25: P/MTPM/11n t (mol)as received8 10 -
Page 26 and 27: P/MTPM/1210,9Degree of saturation (
Page 28 and 29: P/MTPM/13RESULTSFirst, we estimated
Page 30 and 31: P/MTPM/142.5Energy (M eV)1.6 1.7 1.
Page 32 and 33: P/MTPM/15C/Co10.90.80.70.60.50.40.3
Page 34 and 35: P/MTPM/16ModelIrmayvG-M1vG-M2vG-M3T
Page 36 and 37: P/MTPM/17Figure 1: Experimental HTO
Page 38 and 39: P/MTPM/18Diffusion experiments were
Page 40 and 41: P/MTPM/19Figure 1: Used mesh for co
Page 42 and 43: P/MTPM/201.81.61.41.2upstream compa
Page 44 and 45: P/MTPM/21490Pressure [bar]0 10 20 3
Page 46 and 47: 134P/MTPM/22through-diffusion exper
Page 48 and 49: P/MTPM/23HA (µg/g)3002001000(a):pH
Page 50 and 51: P/MTPM/24through each sample. The p
Page 52 and 53: P/MTPM/25FIRST RESULTSPreliminary c
Page 54 and 55: P/MTPM/26heterogeneous distribution
Page 56 and 57: P/MTPM/27Relative concentration (C-
Page 58 and 59: P/MTPM/280.75m0.25mTable 1: Cross s
Page 60 and 61: P/MTPM/29Figure 1: A. Scheme of the
Page 62 and 63: P/MTPM/30The presented theory is ex
Page 64 and 65: P/MTPM/31Furthermore, Van Loon et a
Page 66 and 67: P/MTPM/32RESULTSResults show that,
Page 70 and 71: P/MTPM/341.60E-11f H2-d total (kg.m
Page 72 and 73: P/MTPM/350.50η R ()0.400.300.200.1
Page 74 and 75: P/MTPM/36200Bq/g1801601401201008060
Page 76 and 77: P/MTPM/37Argilite (ionic strength 0
Page 78 and 79: P/MTPM/38-Samples cored at 12m were
Page 80 and 81: P/MTPM/39APPLICATIONSCORE 2D has be
Page 82 and 83: P/MTPM/40Figure 1: Sketch drawing o
Page 84 and 85: P/MTPM/41Figure 1: Thermal conducti
Page 86 and 87: P/MTPM/42Figure 2: Model of pore st
Page 88 and 89: P/MTPM/43The available data are con
Page 90 and 91: P/MTPM/44Figure 1: Spatial extensio
Page 92 and 93: P/MTPM/45Relative concentration / (
Page 94 and 95: P/MTPM/46Figure 2: Swelling pressur
Page 96 and 97: P/MTPM/47then used in the transport
Page 98: P/MTPM/4820181614121086Gas pressure
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Mass Transfer & Porous Media (MTPM) - Andra

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