Journal Article

FZJ-2017-07077

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microtomography-based Inter-Granular Network for the simulation of radionuclide diffusion and sorption in a granitic rock

Iraola, A. (Corresponding author) ; Trinchero, P. (Corresponding author) ; Voutilainen, M. ; Gylling, B. ; Selroos, J.-O. ; Molinero, J. ; Svensson, U. ; Bosbach, D.FZJ* ; Deissmann, G.FZJ*

2017
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/15961  doi:10.1016/j.jconhyd.2017.10.003

Abstract: Field investigation studies, conducted in the context of safety analyses of deep geological repositories for nuclear waste, have pointed out that in fractured crystalline rocks sorbing radionuclides can diffuse surprisingly long distances deep into the intact rock matrix; i.e. much longer distances than those predicted by reactive transport models based on a homogeneous description of the properties of the rock matrix. Here, we focus on cesium diffusion and use detailed micro characterisation data, based on micro computed tomography, along with a grain-scale Inter-Granular Network model, to offer a plausible explanation for the anomalously long cesium penetration profiles observed in these in-situ experiments. The sparse distribution of chemically reactive grains (i.e. grains belonging to sorbing mineral phases) is shown to have a strong control on the diffusive patterns of sorbing radionuclides. The computed penetration profiles of cesium agree well with an analytical model based on two parallel diffusive pathways. This agreement, along with visual inspection of the spatial distribution of cesium concentration, indicates that for sorbing radionuclides the medium indeed behaves as a composite system, with most of the mass being retained close to the injection boundary and a non-negligible part diffusing faster along preferential diffusive pathways.

Note: Onlinefirst

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Contributing Institute(s):

1. Nukleare Entsorgung und Reaktorsicherheit (IEK-6)
2. JARA - HPC (JARA-HPC)

Research Program(s):

1. 161 - Nuclear Waste Management (POF3-161) (POF3-161)
2. Understanding coupled reactive transport in fractured crystalline rocks at sub-millimeter scale (jiek63_20141101) (jiek63_20141101)

Appears in the scientific report 2017

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Database coverage:
; ; BIOSIS Previews ; Current Contents - Agriculture, Biology and Environmental Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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