Contribution to the Study of the Pseudobinary Zr1Nb-O Phase Diagram and Its Application to Numerical Modeling of the High-Temperature Steam Oxidation of Zr1Nb Fuel Cladding

0473300 - ÚFE 2017 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Negyesi, M. - Krejčí, J. - Linhart, S. - Novotný, L. - Přibyl, A. - Burda, J. - Klouček, V. - Lorinčík, Jan - Sopoušek, J. - Adámek, J. - Siegl, J. - Vrtílková, V.
Contribution to the Study of the Pseudobinary Zr1Nb-O Phase Diagram and Its Application to Numerical Modeling of the High-Temperature Steam Oxidation of Zr1Nb Fuel Cladding.
ZIRCONIUM IN THE NUCLEAR INDUSTRY: 17TH INTERNATIONAL SYMPOSIUM. Philadelphia: American Society for Testing and Materials, 2015, s. 897-931. American Society for Testing and Materials Special Technical Publications. ISBN 978-0-8031-7529-7. ISSN 0066-0558.
[17th International Symposium on Zirconium in the Nuclear Industry. Hyderabad (IN), 03.02.2013-07.02.2013]
Institucionální podpora: RVO:67985882
Klíčová slova: Microstructure * Fuel cladding * Zr1Nb-O
Kód oboru RIV: JA - Elektronika a optoelektronika, elektrotechnika

The pseudobinary Zr1Nb-O phase diagram was recently estimated at the Czech research institute UJP using a new experimental procedure. It is based on the oxygen distribution measurement inside fuel claddings previously exposed to high-temperature steam environments, assuming equilibrium conditions being fulfilled at the phase boundaries. The experimental results agreed satisfactorily with the CALPHAD approach, and a further experimental program followed to affirm the phase diagram. This paper is concerned with additional measurements of the oxygen concentrations using wavelength-dispersive spectrometry, secondary ion mass spectrometry, and inert gas fusion techniques and examination of the microstructure in the Zr1Nb cladding wall after high-temperature oxidation. The main goal was to check the validity of the recently proposed Zr1Nb-O phase diagram, or to refine it. The new results of the oxygen concentration measurements confirmed the phase diagram. After that, a new diffusion model, the Jakub Krejci oxidation model, was created using the Zr1Nb-O phase diagram describing the double-sided high-temperature oxidation of the Zr1Nb fuel cladding including the (alpha vertical bar beta)-Zr layer. The numerical calculations were compared to the experimental results with satisfactory agreement. It could be concluded that the proposed experimental procedure provided a good estimation of the Zr1Nb-O phase diagram. Moreover, it can be used for alloys containing a greater amount of hydrogen. The Zr1Nb-O phase diagram may be applicable for oxygen diffusion models predicting the oxidation behavior of Zr1Nb fuel claddings upon high-temperature oxidation
Trvalý link: http://hdl.handle.net/11104/0270454