Transport of ruthenium in primary circuit conditions during a severe NPP accident
| Autor: | N. Davidovich, Teemu Kärkelä, N. Vér, Jouni Pyykönen, Tim Haste, Laurent Cantrel |
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| Přispěvatelé: | Davidovich, N., Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Italian National agency for new technologies, Energy and sustainable economic development [Frascati] (ENEA), VTT Technical Research Centre of Finland (VTT), SARNET2 |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Inorganic chemistry chemistry.chemical_element computational fluid dynamics law.invention Metal Atmosphere law accident source term evaluation code Nuclear power plant Deposition (phase transition) nuclear power plants Irradiation ASTEC Primary circuit CFD/FLUENT Ruthenium Phébus FP Severe accident ruthenium [PHYS]Physics [physics] Fission products severe accidents Coolant primary circuits Nuclear Energy and Engineering chemistry visual_art visual_art.visual_art_medium |
| Zdroj: | Kärkelä, T, Vér, N, Haste, T, Davidovich, N, Pyykönen, J & Cantrel, L 2014, ' Transport of ruthenium in primary circuit conditions during a severe NPP accident ', Annals of Nuclear Energy, vol. 74, pp. 173-183 . https://doi.org/10.1016/j.anucene.2014.07.010 Annals of Nuclear Energy Annals of Nuclear Energy, Elsevier Masson, 2014, 74 (C), pp.173-183. ⟨10.1016/j.anucene.2014.07.010⟩ |
| ISSN: | 1873-2100 0306-4549 |
| Popis: | International audience; Ruthenium species, volatilized from damaged fuel during a severe accident in a nuclear power plant, are radiotoxic and can be transported to the containment atmosphere in gaseous form. To limit the possible source term to the environment, it is of interest to understand the behaviour of Ru after it has been released from fuel and the phenomena taking place within the decreasing temperature section of the reactor coolant system. This was investigated in the framework of EC SARNET and SARNET2 projects, as a part of the Source Term work package, with several separate-effect tests on the transport and speciation of Ru in primary circuit conditions considering the influence of other fission products as well. The source of Ru was metallic Ru, RuO2 powder or gaseous RuO4. The large-scale integral tests of the Phébus FP program were conducted with real irradiated fuel, and more realistic analysis on the release and transport of Ru could be performed. Experimental studies proved that the transport of ruthenium to the containment atmosphere took mainly place as RuO2 particles when Ru source was oxidized above 1250 °C. The fraction of Ru transported in gaseous form was at its highest when ruthenium was oxidized at approx. 1000-1100 °C. A major part of the released Ru was deposited at the decreasing temperature area of the circuit as RuO2. Revaporisation of the deposited Ru at low temperature was a significant source of gaseous ruthenium. In order to understand the behaviour of ruthenium in these tests, the analysis work was extensive and several simulations were carried out. As an outcome, the observed transport and deposition of ruthenium was explained. The simulation studies gave also an insight into the performance of the ASTEC code and some model improvements for Ru transport through the reactor coolant system have been identified. © 2014 Elsevier Masson SAS. |
| Databáze: | OpenAIRE |
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