Ruthenium behaviour in severe accident condition

Ulrika Backman, Maija Lipponen, Ari Auvinen, Tommi Renvall, Unto Tapper, Riitta Zilliacus, Jorma K. Jokiniemi

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

    Abstract

    In this project the transport and speciation or ruthenium in conditions simulating an air ingress accident was studied. Ruthenium dioxide was exposed to oxidising environment at high temperatures (>1200 C) in a tubular flow furnace. At these conditions volatile ruthenium species were formed. A major part of the released ruthenium was deposited in the tube as RuO2. Depending on the experimental conditions 12-35 wt-% of the released ruthenium was trapped in the outlet filter as RuO2 particles. At completely dry conditions using stainless steel tubes only 0.1-0.2 wt-% of the released ruthenium reached the trapping bottle as gaseous RuO4. However, when alumina was applied as tube material or the atmosphere contained some water vapour the fraction of RuO4 reaching the trapping bottle increased to 5 wt-%, which is close to thermodynamic equilibrium at the temperature of the furnace. This indicates that RuO4 was not decomposed in these experiments.
    Original languageEnglish
    Title of host publicationSAFIR, The Finnish Research Programme on Nuclear Power Plant Safety 2003 - 2006
    Subtitle of host publicationInterim Report
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages175-182
    ISBN (Electronic)951-38-6516-9
    ISBN (Print)951-38-6515-0
    Publication statusPublished - 2004
    MoE publication typeD2 Article in professional manuals or guides or professional information systems or text book material

    Publication series

    SeriesVTT Tiedotteita - Research Notes
    Number2272
    ISSN1235-0605

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