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The 6th FWP SARNET project launched a set of studies to enhance understanding and predictability of relevant-risk scenarios where uncertainties related to aerosol phenomena were still significant: retention in complex structures, such as steam generator by-pass SGTR sequences or cracks in concrete walls of an over-pressurised containment, and primary circuit deposit remobilization, either as vapours (revaporisation) or aerosols (resuspension). This paper summarizes the major advances achieved.
Progress has been made on aerosol scrubbing in complex structures. Models based on empirical data (ARISG) and improvements to previous codes (SPARC) have been proposed, respectively, for dry and wet aerosol retention, but, further development and validation remains, as was noted during the ARTIST international project and potential successors. New CFD models for particle-turbulence interactions have been developed based on random walk stochastic treatments and have shown promise in accurately describing particle deposition rates in complex geometries. Aerosol transport in containment concrete cracks is fairly well understood, with several models developed but validation was limited. Extension of such validation against prototypic data will be feasible through an ongoing joint experimental program in the CEA COLIMA facility under the 6th Framework PLINIUS platform.
Primary deposit revaporisation has been experimentally demonstrated on samples from the Phebus-FP project. Data review has pinpointed variables affecting the process, particularly temperature. Available models have been satisfactorily used to interpret separate-effect tests, but performing integral experiments, where revaporisation is likely combined with other processes, still pose a difficult challenge. Further experimental data as well as modelling efforts seem to be necessary to get a full understanding.

Additional information

Authors: HERRANZ L E, Centro de Investigaciones Energéticas MedioAmbientales y Tecnológicas (CIEMAT), Madrid (ES);BALL J, Atomic Energy of Canadá Limited (AECL), Chalkriver (CA);AUVINEN A, Technical Research Centre of Finland (VTT), Espoo (FI);BOTTOMLEY D, European Commission JRC-ITU, Karsruhe (DE);DEHBI A, Paul Scherrer Institut (PSI), Villigen (CH);HOUSIADAS C, Demokritos, Athens (EL);PILUSO P, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LAYLY V, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), St-Paul-Lez-Durance (FR);PAROZZI F, CESI Ricerca, Milan (IT);REEKS M, Newcastle University, Newcastle (UK)
Bibliographic Reference: An article published in: Progress in Nuclear Energy, Volume 52, Issue 1, January 2010, Pages 120-127
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: 10.1016/j.pnucene.2009.09.013
Record Number: 201010043 / Last updated on: 2010-01-13
Original language: en
Available languages: en