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Enhancing Nuclear Safety


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Study on the resuspension of a glass microsphere powder

 

F. Gensdarmes (1), J. Vendel (1), O. Witschger(1) et J. Monnatte (2), CFA 2003 - 19th Congrès Français sur les Aérosols, 10-11th décember 2003, Paris.

(1) Institut de Radioprotection et de Sûreté Nucléaire, Laboratoire de Physique et Métrologie des Aérosols. IRSN/DSU/SERAC – BP 68, 91192 Gif-sur-Yvette cedex.(2) COGEMA, Direction Sûreté, Sécurité, Santé. 2 rue Paul Dautier BP 4, 78141 Vélizy cedex.+ adresse actuelle : Institut National de Recherche et de Sécurité, Laboratoire de Métrologie des Aérosols, Avenue de Bourgogne, BP 27, 54501 Vandoeuvre-les-Nancy.

Document type > *Congrès/colloque

Keywords > airborne contamination

Research Unit > LPMAC (Aerosol/containment physics and metrology laboratory)

Authors > GENSDARMES François, VENDEL Jacques

Publication Date > 12/01/2004

Summary

Within the framework of a research programme on the safety of the nuclear fuel facilities, we study the resuspension of particles by an accidental free fall of powder. The test powder is composed of glass microspheres characterised by an equivalent volume median diameter equal to 34 µm and a geometrical standard deviation equal to 1.5. The free fall experiments are carried out for a height equal to 1.4 meters and for masses ranging between 10 g and 200 g. The mass fractions of particles released after the free fall lie between 10-3 and 10-2. In addition, we measure the size distribution of the aerosol produced by using the Coulter technique; the median diameter of this aerosol is equal to 14 µm and its geometrical standard deviation equal to 1.4. The notable difference between the size distributions of the powder and the aerosol can have several origins. We can quote: the probability of resuspension of the particles according to their diameter, the fast sedimentation of the largest particles in suspension, the sampling efficiency of the aerosol sampler.

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