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Etude de l'efficacité de confinement assuré par une boîte à gants en situations accidentelles de fonctionnement


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Titre du congrès :AIHce - VENT 2006 Ville du congrès :Chicago Date du congrès :13/05/2006

Type de document > *Congrès/colloque

Mots clés > boîte à gants, confinement

Unité de recherche > IRSN/DSU/SERAC/LECEV

Auteurs > BOUILLOUX Laurent, COLIN Romaric, PREVOST Corinne

Date de publication > 18/05/2006

Résumé

The Institute for Radiological Protection and Nuclear Safety (IRSN) carries out research and analysis within the fields of nuclear safety, protection against ionizing rays, control and protection of nuclear materials. The purpose of the present study consists in quantifying the intensity of polluting agents propagation phenomenon when a gloves box is used under incident conditions that is, in this case, the breakage of static confinement by a sudden gloves or bags breakdown. The knowledge of the confinement efficiency is of primary importance because it conditions the concentration in radioactive element likely to be breathed by an operator. In nuclear industry, the operator protection is normally assumed by the dynamic confinement technique that consists in creating, at the level of the opening of the enclosure, an airflow directed toward the interior of this one, with a sufficient velocity value in order to limit the diffusion of the airborne contamination towards outside. The present paper concerns applications of gas and aerosol tracer techniques in order to determine coefficients of back dissemination of a polluting agent in many different normal or accidental configurations and in particular when an experimental manikin is used to simulate the presence of an operator at his working station. Tracers techniques are applied to understand the behavior of pollutants such as gases or particles of various size distributions, ranging between 0.18 µm and 5 µm (aerodynamic diameters) near the opening when a glove or other equipment of the ventilated box is broken. Finally, results highlight the presence of a significant back dissemination of a polluting agent whatever is its nature, and one determines useful data to precisely evaluate the concentrations inhaled by an operator since the internal pollutant flow rate known