Experiments on the behaviour of ruthenium in airingress accidents

Teemu Kärkelä, Ulrika Backman, Ari Auvinen, Riitta Zilliacus, Maija Lipponen, Tommi Kekki, Unto Tapper, Jorma Jokiniemi

    Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

    Abstract

    In this project the release, transport and speciation of ruthenium in conditions simulating an air ingress accident was studied. Ruthenium dioxide was exposed to oxidising environment at high temperature (1100-1700 K) in a tubular flow furnace. At these conditions volatile ruthenium species were formed. Majority of the released ruthenium was deposited in the tube as RuO2. Depending on the experimental conditions ~1-26 wt-% of the released ruthenium was trapped in the outlet filter as RuO2 particles. In stainless steel tube ~0-8.8 wt-% of the released ruthenium reached the trapping bottle as gaseous RuO4. A few experiments were carried out, in which revaporisation of ruthenium deposited on the tube walls was studied. In these experiments oxidation of RuO2 took place at a lower temperature. During revaporisation experiments 35-65% of ruthenium transported as gaseous RuO4. In order to close mass balance and achieve better time resolution four experiments were carried out using a radioactive tracer.
    Original languageEnglish
    Title of host publicationSAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006
    Subtitle of host publicationFinal Report
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages253-262
    ISBN (Electronic)951-38-6887-7
    ISBN (Print)951-38-6886-9
    Publication statusPublished - 2006
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Tiedotteita - Research Notes
    Number2363
    ISSN1235-0605

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