Experimental and modelling studies of iodine oxide formation and aerosol behaviour relevant to nuclear reactor accidents

S. Dickinson (Corresponding Author), Ari Auvinen, Y. Ammar, L. Bosland, B. Clement, F. Funke, G. Glowa, Teemu Kärkelä, D.A. Powers, S. Tietze, G. Weber, S. Zhang

    Research output: Contribution to journalArticleScientificpeer-review

    21 Citations (Scopus)

    Abstract

    Plant assessments have shown that iodine contributes significantly to the source term for a range of accident scenarios. Iodine has a complex chemistry that determines its chemical form and, consequently, its volatility in the containment. If volatile iodine species are formed by reactions in the containment, they will be subject to radiolytic reactions in the atmosphere, resulting in the conversion of the gaseous species into involatile iodine oxides, which may deposit on surfaces or re-dissolve in water pools. The concentration of airborne iodine in the containment will, therefore, be determined by the balance between the reactions contributing to the formation and destruction of volatile species, as well as by the physico-chemical properties of the iodine oxide aerosols which will influence their longevity in the atmosphere. This paper summarises the work that has been done in the framework of the EC SARNET (Severe Accident Research Network) to develop a greater understanding of the reactions of gaseous iodine species in irradiated air/steam atmospheres, and the nature and behaviour of the reaction products. This work has mainly been focussed on investigating the nature and behaviour of iodine oxide aerosols, but earlier work by members of the SARNET group on gaseous reaction rates is also discussed to place the more recent work into context.
    Original languageEnglish
    Pages (from-to)200-207
    JournalAnnals of Nuclear Energy
    Volume74
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed
    Event6th European Review meeting on Severe Accident Research, ERMSAR-2013 - Avignon, France
    Duration: 2 Oct 20134 Oct 2013
    Conference number: 6

    Keywords

    • iodine
    • severe accidents
    • radiation
    • iodine oxide
    • methyl iodine
    • aerosol

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