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Comportement des produits de corrosion dans le circuit primaire des centrales REP - sorption du cobalt et du nickel sur des ferrites représentatifs

Abstract : The corrosion of the metal parts in the primary circuit of PWR leads to the release of metal oxides particles and ionic species. These corrosion products circulate through the primary circuit and may be activated when they pass through the core. The deposition of the activated particles and ions in areas out of flux is then responsible for surface contamination. In order to have better contamination control, characterization (specific surface, sire, PZC...) of differents particles of primary circuit and study of interaction of corrosion products between them or with surfaces (adhesion, sorption...) is necessary. Species take into account in this study are, for particles : nickel and cobalt ferrites and magnetite, for primary circuit materials : Inconel 690, Zircaloy 4 and stainless steel 304L. Cobalt and nickel sorption, main responsible of primary circuit contamination, on several corrosion products were experimentally realized and modelised with ECOSAT code. Surface charge were also studied. Data obtained will be introduced in different calculation code in order to modelised contamination in primary circuit under dynamics conditions. Sorption and precipitation are in competition for ion concentrations higher than 10-5 M and elevated pH. Corrosion products deposition, with preliminary sorption or not, is favored on wide pH range, whatever the oxide layer thickness of primary circuit materials. Modeling confirmed that hydraulic should be take into account in studies of deposition phenomenon.
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Submitted on : Monday, May 23, 2011 - 1:25:21 PM
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Bruna Martin Cabanas. Comportement des produits de corrosion dans le circuit primaire des centrales REP - sorption du cobalt et du nickel sur des ferrites représentatifs. Energie électrique. Université Paris Sud - Paris XI, 2010. Français. ⟨tel-00595061⟩

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