A Complementary Study to the Chemical Behaviour of Caesium Iodide in Presence of Boron in Condensed Phase (650 °C and 400 °C) under Primary Circuit Conditions: Differential Thermal Analysis and Thermogravimetric Studies

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    Abstract

    This work is a contribution to the work performed in a paper on the understanding of the chemical reactions between cesium iodide and boron oxide in condensed phase, under conditions close to the ones prevailing in the primary circuit of a nuclear power plant in case of a severe accident. The thermal degradation of samples made from cesium iodide or cesium iodide and boron oxide mixtures has been investigated using the techniques of thermogravimetric analysis and differential thermal analysis at temperatures from 20°C to 1000°C. The boron-to-cesium molar ratio in the investigated mixture was fixed at about the value of 5 (B/Cs = 5). Apart from the dehydration of boric acid, evidence is presented for the formation of a vitreous compound at 360°C to 420°C, depending on the atmosphere composition.
    Carrier gas composition also seemed to influence the behavior of the precursor mixture. While under air and argon, the recorded thermograms are similar. In the presence of argon/water vapor, a specific behavior and difference on reactivity is noticed, due to the adsorption of water from the carrier gas at the beginning of the process. It was also pointed out that the addition of water or oxygen delayed the glass formation process.
    LanguageEnglish
    Pages85-91
    Number of pages7
    JournalNuclear Technology
    Volume203
    Issue number1
    Early online dateMar 2018
    DOIs
    Publication statusPublished - 21 Mar 2018

    Fingerprint

    Cesium iodide
    Differential thermal analysis
    Boron
    Networks (circuits)
    Argon
    Boric acid
    Oxides
    Cesium
    Chemical analysis
    Dehydration
    Gases
    Water vapor
    Nuclear power plants
    Thermogravimetric analysis
    Water
    Chemical reactions
    Accidents
    Pyrolysis
    Adsorption
    Glass

    Keywords

    • Boron
    • cesium iodide
    • thermogravimetric analysis
    • differential thermal analysis

    OKM Publication Types

    • A1 Refereed journal article

    OKM Open Access Status

    • 0 Not Open Access

    Cite this

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    title = "A Complementary Study to the Chemical Behaviour of Caesium Iodide in Presence of Boron in Condensed Phase (650 °C and 400 °C) under Primary Circuit Conditions: Differential Thermal Analysis and Thermogravimetric Studies",
    abstract = "This work is a contribution to the work performed in a paper on the understanding of the chemical reactions between cesium iodide and boron oxide in condensed phase, under conditions close to the ones prevailing in the primary circuit of a nuclear power plant in case of a severe accident. The thermal degradation of samples made from cesium iodide or cesium iodide and boron oxide mixtures has been investigated using the techniques of thermogravimetric analysis and differential thermal analysis at temperatures from 20°C to 1000°C. The boron-to-cesium molar ratio in the investigated mixture was fixed at about the value of 5 (B/Cs = 5). Apart from the dehydration of boric acid, evidence is presented for the formation of a vitreous compound at 360°C to 420°C, depending on the atmosphere composition.Carrier gas composition also seemed to influence the behavior of the precursor mixture. While under air and argon, the recorded thermograms are similar. In the presence of argon/water vapor, a specific behavior and difference on reactivity is noticed, due to the adsorption of water from the carrier gas at the beginning of the process. It was also pointed out that the addition of water or oxygen delayed the glass formation process.",
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    author = "Melany Gouello and Jouni Hokkinen and Teemu K{\"a}rkel{\"a} and Ari Auvinen",
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