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Résumé

Decommissioning of nuclear installations produces large-sized metallic components difficult to compact or to insert in the usual containers. The purpose of this study was to develop a coating procedure for low and medium activity wastes, in order to: + fix the contamination of the waste by a first appropriate layer; + protect this layer from mechanical shocks by a second thick layer; + reduce the diffusion of radionuclides. The study has proven the feasibility of depositing epoxy resins by electrostatic spraying in a nuclear environment on steel substrata with an efficiency higher than 95%; showing that it is possible to work in closed ventilated rooms without risk of clogging the filters. Two layers of epoxy resin are sufficient to fix contamination with a factor of 8600; their thickness (about 30 mum) nevertheless limits their use of this application. To reduce diffusion of radionuclides (60-Co and 137-Cs), polyurethane resins were chosen with which it is possible to obtain a thick coating in only a short time. Their properties of fixing the contamination, retaining of radionuclides and resistance to impact, have been assessed. First application of the procedure on a contaminated metallic bellow coming from dismantling of a nuclear reactor, has been carried out.

Informations supplémentaires

Auteurs: DE TASSIGNY C CEA, CENTRE D'ETUDES NUCLEAIRES DE GRENOBLE (FRANCE), CEA, CENTRE D'ETUDES NUCLEAIRES DE GRENOBLE (FRANCE)
Références bibliographiques: EUR 9666 FR (1985) FS, 25 P., BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilité: Can be ordered online
Numéro d'enregistrement: 1989123094000 / Dernière mise à jour le: 1987-01-01
Catégorie: publication
Langues disponibles: fr