Comparison of the High Burn-Up Corrosion on M5 and Low Tin Zircaloy-4

    Volume 3, Issue 1 (January 2006)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Page Count: 32


    Bossis, P
    Research Engineer, CEA-Saclay, DEN/DMN/SEMI, Gif-sur-Yvette Cédex,

    Pêcheur, D
    Research Engineer, CEA-Cadarache, DEN/DEC/SA3C, Saint-Paul-lez-Durance Cédex,

    Hanifi, K
    Research Engineer, FRAMATOME-ANP, Lyon Cédex 06,

    Thomazet, J
    Research Engineer, FRAMATOME-ANP, Lyon Cédex 06,

    Blat, M
    Research Engineer, Electricité de France, R&D Division, Centre des Renardières, Ecuelles, Moret-Sur-Loing cedex,

    (Received 12 May 2004; accepted 27 June 2005)

    Abstract

    The corrosion and hydriding behavior of M5 and low tin Zircaloy-4 in PWR have been compared at high burn-ups (>70 GWd/t). Whereas low tin Zircaloy-4 reached about 90 μm in oxide thickness and is subjected to significant precipitation of hydride rims at the metal/oxide interface, the oxide layer on M5 remains below 20 μm, and a hydrogen content remains below 100 ppm. Owing to the modification of the oxide structure and hydrogen localization observed, it is proposed that, concerning the high burn-up corrosion acceleration of Zircaloy-4, the tin content is the parameter governing the onset of the high burn-up corrosion acceleration, which is further accelerated by hydride precipitation at the metal/oxide interface and dissolution of precipitates. On M5, since no significant evolution of the oxide structure was observed, and none of the parameters identified as contributors to acceleration are present, no acceleration of corrosion kinetics is expected at higher burn-ups.


    Paper ID: JAI12404

    DOI: 10.1520/JAI12404

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    Author
    Title Comparison of the High Burn-Up Corrosion on M5 and Low Tin Zircaloy-4
    Symposium Zirconium in the Nuclear Industry: Fourteenth International Symposium, 2004-06-15
    Committee B10