Geostatistics for the characterization of nuclear facilities, sites and waste
Geostatistics is a relevant tool for characterizing the radioactivity at each phase of a decommissioning project (during operation, after shut-down, or during dismantling), a site remediation project (during site investigation and after remediation work to check the site compliance with cleanup regulations) or in post-accidental context.
Whatever the phenomenon (contamination, activation, NORM, …) and the impacted materials (soil, concrete, groundwater, graphite, process equipment, …), geostatistics offers a range of tools for:
– sampling campaign optimization to meet the quality objectives of each phase of the characterization process,
– identification of the contamination extension,
– sound radiological waste classification enabling a quantified risk analysis that informs decision-making.
In the nuclear industry, geostatistics also advantageously applies to other fields: hydrogeology, carbon content, waste packages, etc.
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KARTOTRAK
THE INTEGRATED SOFTWARE SOLUTION FOR CONTAMINATED SITE AND SOIL CHARACTERIZATION Discover KARTOTRAK
CEA LASE has developed the Digital Autoradiography technique to obtain images of radionuclides that can be found in nuclear wastes and are difficult to measure. Kartotrak is used to process the large datasets that derive from it and produce accurate maps of radionuclides.
Geovariances has developped a dedicated geostatistics-based library which is part of ISYmap's GLOBall, a revolutionary system allowing remoted and fast dose rate measurement and mapping, easy and quick to set up by operators staying far from hazard area in safe conditions.
IRSN intensively uses Kartotrak for efficient generation of precise maps and quotes Kartotrak as efficient and a very good software solution in emergency situations.
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Resources
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Kartotrak | How confident are you with your management plan quality?
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Kartotrak | Etes-vous sûr de la qualité de vos plans de gestion ?
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Kartotrak : Solution logicielle intégrée pour la caractérisation des sites et sols contaminés
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Kartotrak: Integrated Software Solution for Contaminated Site Characterization
Data Quality Control
Before starting an evaluation of the contamination leading to decision-making tools for site clean-up, it is essential to ensure data quality. Thus, based on solid and reliable foundations, uncertainties occurring during the different steps of the decision process will be better controlled and the final quality of the project improved.
The objective of this white paper is to assess at best the validity of the data through visual, statistical and geostatistical basic tools before going further into their analysis.
Dose Rate Mapping
The objective of any serious mapping is to obtain a realistic and reliable image of the studied phenomenon. Concerning dose rate, maps are often derived from punctual measurements interpolated using deterministic methods. Sometimes, the choice of the inverse distance squared weighted interpolation is wrongly justified by the fact that the dose rate issued from a punctual source is theoretically inversely proportional to the squared distance between the source and the measurement point.
Through this white paper, find out why this inverse distance squared weighted interpolation is not the appropriate method for dose rate mapping and why the geostatistical approach by kriging is the solution for a quality and reliable mapping.
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Spatio-temporal optimization of groundwater monitoring network at Pickering Nuclear Generating Station (video)
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Contributions of the CETAMA working group n°10 on sampling and radiological characterisation (poster) | Anne Courtadon et Danièle Roudil, CEA Marcoule; Yvon Desnoyers, Geovariances; Didier Dubot, CEA; Guy Granier, IRSN; Catherine Ollivier-Dehaye, EDF
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Visualisation de résultats cartographiques sur une topographie – Exemple de Fukushima | Présenté à la réunion utilisateurs Kartotrak 2013 par Y. Desnoyers (Geovariances)
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Section Assainissement du Site et l’évaluation radiologique : méthodologie, outils et applications | Présenté à la réunion utilisateurs Kartotrak 2013 par E. Aubonnet (Geovariances)
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Utilisation du module d’acquisition en temps réel de Kartotrak | Présenté à la réunion utilisateurs Kartotrak 2013 par J. Attiogbe (Geovariances)
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Factorial kriging for estimating and mapping the geochemical background from in situ gamma dose rate measurements downstream of a former uranium mine | Journal of Environmental Radioactivity Volume 237, October 2021, 106681
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Use case 3: post accidental site remediation − CEA | EPJ Nuclear Sci. Technol. 6, 13 (2020) | Yvon Desnoyers and Claire Faucheux, Geovariances; and Nadia Pérot, CEA Cadarache
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Development of a user-friendly guideline for data analysis and sampling design strategy | EPJ Nuclear Sci. Technol. 6, 16 (2020) | Yvon Desnoyers, Geovariances and Bart Rogiers, SCK.CEN Belgian Nuclear Research Centre
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Cetama working group n°10 contributions on sampling and radio-logical characterisation (Technical article) | Anne Courtadon et Danièle Roudil, CEA Marcoule; Yvon Desnoyers, Geovariances; Didier Dubot, CEA; Guy Granier, IRSN; Catherine Ollivier-Dehaye, EDF
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Optimizing flight-line distance for soil decontamination, application to contaminated Fukushima territories