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Enhancing Nuclear Safety


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Study of settlement of fission products in aerosol form by spraying water droplets generated by a PWR spray system

Denis MARCHAND, doctorate of institut national des sciences appliquées de Rouen, 248 p., defended on the 30th may 2008

Document type > *Mémoire/HDR/Thesis

Keywords > ionic microscopy, severe accident, global dissolution, three-phase flow

Research Unit > IRSN/DSU/SERAC/LECEV

Authors > MARCHAND Denis

Publication Date > 30/05/2008

Summary

The study investigatecl the physical phenomena involved in the aerosols washout by water droplets for thermal hydraulic conditions representative of a severe accident in a PWR simulated into the TOSQAN vessel. A aerosols characterization (WELAS, turbiditimeter) coupled with the spray characteristics measurements (pDA, PIV), provided detailed information allowing to obtain reproducible results showing that aerosols collection dynamics has two phases characterized by two distinct removal rates. The average elementary collection efficiency per aerosols dass was estimated according to the water flow rates and the droplets temperature injection. The comparison between the numerical approach (A5TEC's code) and the experimental results on the collected mass by the droplets showed a good agreement at the test beginning, then a light dissension after a certain time related on the experimental limits of measurernent and the limits of the code.

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Emmanuel Porcheron, the thesis supervisor

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