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Approche méthodologique pour la caractérisation géostatistique des contaminations radiologiques dans les installations nucléaires

Abstract : The decommissioning of nuclear sites represents huge industrial and financial challenges. At the end of process equipment dismantling, the complete decontamination of nuc-lear facilities requires the radiological assessment of residual activity levels of the building struc-tures (waste zoning). From this point of view, the set up of an appropriate evaluation methodology is of prime importance. The developed radiological characterization is divided into three steps: historical and functional analysis, radiation mapping and in-depth investigations. Combined with relevant data analysis and processing tools, this methodology aims at optimizing the investigation costs and the radiological waste volumes. In a former CEA nuclear facility, a substantial radiation survey was performed at the beginning of the thesis in order to try and test the methodology. The relevance of geostatistics was also illu-strated: exploratory data analysis, spatial structure analysis through the variogram, mapping, risk analysis results, isofactorial modeling to take the structuring of extreme values into account. Destructive concrete samples are then integrated to complete the characterization in addition to radiation data through the geostatistical multivariate approach. Finally, waste segregation results from the risk of exceeding given radiological thresholds. An inventory of the spatial structures of radiological contaminations in nuclear facilities is provided within the geostatistical framework. It leads to sampling recommendations in order to improve the overall characterization strategy and optimize the investigation costs.
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https://pastel.archives-ouvertes.fr/pastel-00839164
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Submitted on : Thursday, June 27, 2013 - 12:09:41 PM
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  • HAL Id : pastel-00839164, version 1

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Yvon Desnoyers. Approche méthodologique pour la caractérisation géostatistique des contaminations radiologiques dans les installations nucléaires. Sciences de la Terre. École Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0063⟩. ⟨pastel-00839164⟩

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