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INSIDER is an EU Horizon 2020 research project, within the topic NFRP-7 of the EURATOM programme, that aims to develop and validate a new and improved integrated characterization methodology and strategy for the nuclear decommissioning and dismantling operations (D&D) of nuclear power plants, and post-accidental land remediation of nuclear facilities under constrained environments. | Progress in Nuclear Energy 124 2020 103347 Contents lists available at ScienceDirect Progress in Nuclear Energy journal homepage http www.elsevier.com locate pnucene Classification and categorization of the constrained environments in nuclear radiological installations under decommissioning and dismantling processes Frederic Aspe a Raquel Idoeta b Gregoire Auge a Margarita Herranz b a Mesures Nucl eaires- Direction Technique Onet Technologies 970 Chemin des agriculteurs 26701 Pierrelatte France b Nuclear Engineering and Fluid Mechanics Department University of the Basque Country UPV EHU . Pza Ingeniero Torres Quevedo 1 48013 Bilbao Spain A R T I C L E I N F O A B S T R A C T Keywords INSIDER is an EU Horizon 2020 research project within the topic NFRP-7 of the EURATOM programme that Nuclear installations aims to develop and validate a new and improved integrated characterization methodology and strategy for the Decommissioning and dismantling nuclear decommissioning and dismantling operations D amp D of nuclear power plants and post-accidental land Constrained environments remediation of nuclear facilities under constrained environments. In line with this general objective the defi In-situ measurements nition and implementation of the practical considerations surrounding the radiological characterization of nu clear radioactive facilities subject to a D amp D programme is under development. . In-situ measurements are key for this radiological characterization. However in some cases these measure ments have to be carried out under constrained conditions which poses some challenges to their realization. A constrained environment is a general term that includes all types of environment that hinder the choice of a non- destructive in-situ measurement method. In the context of this paper it is applied to different situations radioactive levels of the area to be characterised difficult accessibility of this area type and properties of the materials contained in it as .