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Conference Papers Year : 2022

Study of the behavior of copper species in presence of pollutants in steam generator flow-restricted areas

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Abstract

This work presents the experimental study of the behavior of copper and copper oxides in presence of pollutants in steam generator flow-restricted areas. The experiments were conducted under secondary circuit thermochemical conditions. Two redox conditions were performed, reducing ones to reproduce operating conditions, with or without presence of magnetite, and a weakly oxidizing one to simulate an oxygen inlet. High concentrations of sodium and phosphates were used to simulate a heavily polluted environment that can be encountered in flow-restricted areas during hideout process. In a steam generator (SG) of a Pressurized Water Reactor (PWR), the hideout process can occur in flow-restricted areas. Non-volatile polluting species tend to accumulate in these regions due to boiling. Their concentrations can reach up to several orders of magnitude [1] above those encountered in the chemical conditioning yielding extreme pH values. Such pollutants include various metallic elements like iron, nickel, sodium, aluminum or copper, and other ions like sulfates, chlorides or phosphates. Some authors have already discussed the behavior of solid copper species in presence of phosphate under secondary circuit thermochemical conditions. Turner et al. [2] showed how sodium phosphate lead to a consolidation of a magnetite-copper sludge already formed with few information on which phases were observed, and Ziemniak et al. [3] and Palmer [4] had a major focus on the dissolved species rather than the solids. This study is a step towards a more complete description of the flow-restricted areas, including the interaction of copper and copper oxides with other species present in the secondary circuit. The objective was to identify the stable solid copper-containing species under the thermochemical conditions encountered in SG flow-restricted areas
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cea-03938683 , version 1 (13-01-2023)

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  • HAL Id : cea-03938683 , version 1

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Thibault Vital, Marion Roy, Dominique You. Study of the behavior of copper species in presence of pollutants in steam generator flow-restricted areas. Fontevraud 10 - International Symposium Contribution of Materials Investigations and Operating Experience to LWRs’ Safety, Performance and Reliability, SFEN, Sep 2022, Avignon, France. ⟨cea-03938683⟩
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