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Study of secondary hydriding at high temperature in zirconium based nuclear fuel cladding tubes by coupling information from neutron radiography/tomography, electron probe micro analysis, micro elastic recoil detection analysis and laser induced breakdown spectroscopy microprobe

Abstract : This paper gives an overview of a multi-scale experimental study of the secondary hydriding phenomenathat can occur in nuclear fuel cladding materials exposed to steam at high temperature (HT) after havingburst (loss-of-coolant accident conditions). By coupling information from several facilities, includingneutron radiography/tomography, electron probe micro analysis, micro elastic recoil detection analysisand micro laser induced breakdown spectroscopy, it was possible to map quantitatively, at differentscales, the distribution of oxygen and hydrogen within M51 clad segments having experiencedballooning and burst at HT followed by steam oxidation at 1100 and 1200 C and final direct waterquenching down to room temperature. The results were very reproducible and it was confirmed thatinternal oxidation and secondary hydriding at HT of a cladding after burst can lead to strong axial andazimuthal gradients of hydrogen and oxygen concentrations, reaching 3000e4000 wt ppm and 1.0e1.2 wtpercent respectively within the b phase layer for the investigated conditions. Consistent with thermodynamicand kinetics considerations, oxygen diffusion into the prior-b layer was enhanced in theregions highly enriched in hydrogen, where the a(O) phase layer is thinner and the prior-b layer thicker.
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https://hal-cea.archives-ouvertes.fr/cea-02339941
Contributor : Bibliothèque Cadarache <>
Submitted on : Wednesday, October 30, 2019 - 3:48:52 PM
Last modification on : Tuesday, April 28, 2020 - 11:28:13 AM

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Jc. Brachet, D. Hamon, M. Lesaux, V. Vandenberghe, C. Toffolon-Masclet, et al.. Study of secondary hydriding at high temperature in zirconium based nuclear fuel cladding tubes by coupling information from neutron radiography/tomography, electron probe micro analysis, micro elastic recoil detection analysis and laser induced breakdown spectroscopy microprobe. Journal of Nuclear Materials, Elsevier, 2017, 488, ⟨10.1016/j.jnucmat.2017.03.009⟩. ⟨cea-02339941⟩

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