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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Backman, U., Lipponen, M., Auvinen, A., Renvall, T., Tapper, U., Zilliacus, R., & Jokiniemi, J. K. (2004). Ruthenium behaviour in severe accident condition. In SAFIR, The Finnish Research Programme on Nuclear Power Plant Safety 2003 - 2006: Interim Report (pp. 175-182). VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2272 http://www.vtt.fi/inf/pdf/tiedotteet/2004/T2272.pdf