In this study 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. A large fraction 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.
|Title of host publication||The nuclear renaissance at work : Proceedings of the International Congress on Advances in Nuclear Power Plants, ICAPP 2007|
|Place of Publication||Red Hook, NY|
|Publisher||Curran Associates Inc.|
|Publication status||Published - 2007|
|MoE publication type||A4 Article in a conference publication|
|Event||International Congress on Advances in Nuclear Power Plants, ICAPP 2007 - Nice, France|
Duration: 13 May 2007 → 18 May 2007
|Conference||International Congress on Advances in Nuclear Power Plants, ICAPP 2007|
|Abbreviated title||ICAPP 2007|
|Period||13/05/07 → 18/05/07|
Kärkelä, T., Backman, U., Auvinen, A., Tapper, U., Jokiniemi, J., Zilliacus, R., Lipponen, M., & Kekki, T. (2007). Ruthenium transport experiments in air ingress accident conditions. In The nuclear renaissance at work : Proceedings of the International Congress on Advances in Nuclear Power Plants, ICAPP 2007 (Vol. 1, pp. 517-524). Curran Associates Inc..