Volume 8, Issue 2 (February 2011)

    Effects of Secondary Phase Particle Dissolution on the In-Reactor Performance of BWR Cladding

    (Received 9 February 2010; accepted 18 November 2010)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    Although the complete mechanisms are not yet fully understood, it is well established that the secondary phase particle (SPP) size distribution and chemical composition have a crucial affects in the reactor corrosion rate and hydrogen uptake in boiling water reactor (BWR) cladding. To further study these effects, different selected fuel rod assemblies with standard LK3 cladding materials that have been irradiated in KernKraftwerk Leibstadt (KKL) for three, five, six, seven, and nine annual cycles were investigated using transmission electron microscopy (TEM). TEM analysis of the samples showed that the average size of SPPs increases as the small SPPs are dissolved during irradiation. After three cycles the Fe–Cr bearing SPPs have been identified as completely amorphous over the whole range of examined samples and the Fe–Ni bearing SPPs remained crystalline. The EDX analyses of several Fe–Ni bearing precipitates show that the Fe/Ni ratio stays more or less constant for the irradiated material at 1.5 to 1.6 and drops to about 1 after fast fluence of 17.9×1021 n/cm2 (>1 MeV) for nine cycles sample. Results from this study confirms that the increased oxide thickness, the higher hydrogen content, and the accelerated growth of the rods at rod average burnup of 78 MWd/kgU goes along with a change in the appearance of SPPs by TEM.


    Author Information:

    Valizadeh, S.
    Westinghouse Electric Sweden AB, Västerås,

    Ledergerber, G.
    Kernkraftwerk Leibstadt AG, Leibstadt,

    Abolhassan, S.
    Paul Scherrer Institut, Villigen,

    Jädernäs, D.
    Studsvik Nuclear AB, Nyköping,

    Dahlbäck, M.
    Westinghouse Electric Sweden AB, Västerås,

    Mader, E. V.
    Electric Power Research Institute, Palo Alto, CA

    Zhou, G.
    Westinghouse Electric Sweden AB, Västerås,

    Wright, J.
    Westinghouse Electric Sweden AB, Västerås,

    Hallstadius, L.
    Westinghouse Electric Sweden AB, Västerås,


    Stock #: JAI103025

    ISSN: 1546-962X

    DOI: 10.1520/JAI103025

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    Author
    Title Effects of Secondary Phase Particle Dissolution on the In-Reactor Performance of BWR Cladding
    Symposium 16th International Symposium on Zirconium in the Nuclear Industry, 2010-05-13
    Committee E10