Recherche d'une corrélation entre caractéristiques électrochimiques et relâchement en nickel de l'alliage 690 en milieu primaire d'un Réacteur à Eau Pressurisée

Abstract : One of the biggest challenges for Pressurized Water Reactor (PWR) technology consists in reducing the dosimetry received by the personnel operating around nuclear power plants. On a more specific level, this requires limiting the formation of radionuclides, such as Co-58, responsible for 80% of dose rates around the primary circuit of PWR. Co-58 is generated by the release of Ni from the Steam Generator tubes (SG) and its activation in the primary fluid while passing by the reactor core. The aim of this study is to bring new insight to the understanding of the Ni release phenomena from a study mainly based on the investigation of electrochemical response of native passive films of SG tubes formed at room temperature. Passive films formed on SG industrial tubes with different surface states were studied by electrochemical impedance spectroscopy (EIS) and by XPS, NRA, SEM, and quantum yield measurements. A model of the chemical composition and electronic structure of the oxide film according to the surface finishing was proposed. Corrosion tests at high temperature (325 °C) and high pressure (140 bars) were carried out with an in situ characterization of the electrochemical behavior of the tubes during the oxidation by impedance measurements and Ni release measurements. The ex situ electrochemical and photoelectrochemical characterization of the oxide films formed at high temperature leads to the determination of the parameter that can directly be linked with the tubes behavior in terms of Ni release within PWR primary circuit.
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Salma El Euch. Recherche d'une corrélation entre caractéristiques électrochimiques et relâchement en nickel de l'alliage 690 en milieu primaire d'un Réacteur à Eau Pressurisée. Matériaux. Sorbonne Université, 2019. Français. ⟨tel-02304680⟩

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