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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  • Cite this

    Kärkelä, T., Backman, U., Auvinen, A., Zilliacus, R., Lipponen, M., Kekki, T., Tapper, U., & Jokiniemi, J. (2006). Experiments on the behaviour of ruthenium in airingress accidents. In SAFIR: The Finnish Research Programme on Nuclear Power Plant Safety 2003-2006 : Final Report (pp. 253-262). VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2363 http://www.vtt.fi/inf/pdf/tiedotteet/2006/T2363.pdf