Analysis of the ambient conditions in an IL-LLW storage cell in a deep clay repository during the waiting closure period
Published:January 01, 2014
Luc-Vincent Bénet, Charlaine Bouillet, Jacques Wendling, 2014. "Analysis of the ambient conditions in an IL-LLW storage cell in a deep clay repository during the waiting closure period", Clays in Natural and Engineered Barriers for Radioactive Waste Confinement, S. Norris, J. Bruno, M. Cathelineau, P. Delage, C. Fairhurst, E. C. Gaucher, E. H. Höhn, A. Kalinichev, P. Lalieux, P. Sellin
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In the 2009 Andra repository concept, Intermediate Level Long Lived Wastes are stored in several 100-m-long storage cells. Concrete over-packs are stacked in piles before being emplaced by row. The large sections opened in the slab floor to enable emplacement by the conveyor could have a major effect on the temperature distribution in the storage cell. The aim of the study is to assess the ability of the ventilation to regulate temperatures along the cell. We focus on the period before closure, when the ventilation rate is at a minimum. The issue has been addressed by undertaking numerical simulations. A specific modelling approach based on head-loss correlations has been used to calculate the distributions of temperature and air velocity at a decimetre scale along the storage cell. The heat transfer and the air flow problems have been solved on a 3D mesh representing 225 rows of waste packages, the concrete walls and the surrounding rock. Different scenarios have been considered about the air flow rate, the heat release and the closure of the conveyor sections at several locations. Results have been analysed in terms of flow patterns, temperature distributions and thermal gradients in air and in concrete.
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Clays in Natural and Engineered Barriers for Radioactive Waste Confinement
This Special Publication contains 43 scientific studies presented at the 5th conference on ‘Clays in natural and engineered barriers for radioactive waste confinement’ held in Montpellier, France in 2012. The conference and this resulting volume cover all the aspects of clay characterization and behaviour considered at various temporal and spatial scales relevant to the confinement of radionuclides in clay, from basic phenomenological process descriptions to the global understanding of performance and safety at repository and geological scales. Special emphasis has been given to the modelling of processes occurring at the mineralogical level within the clay barriers.
The papers in this Special Publication consider research into argillaceous media under the following topic areas: large-scale geological characterization; clay-based concept/large-scale experiments; hydrodynamical modelling; geochemistry; geomechanics; mass transfer/gas transfer; mass transfer mechanisms.
The collection of different topics presented in this Special Publication demonstrates the diversity of geological repository research.