Volume 8, Issue 3 (March 2011)

    ZIRLO® Irradiation Creep Stress Dependence in Compression and Tension

    (Received 29 July 2010; accepted 6 February 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    Fuel operating margins in recent years have decreased due to increases in fuel duty. In response, Westinghouse has developed an improved version of Standard ZIRLO®, denoted as Optimized ZIRLO™. This paper is a continuation of a previous paper reported by Foster in 2009, which presented methods used to develop Optimized ZIRLO from Standard ZIRLO. The previous paper only outlined the experimental methods used to determine irradiation creep. This paper presents the detailed methods used to determine in-reactor creep and growth. In addition, in-reactor creep stress dependence in tension and compression will be evaluated. The results show that the: (1) In-reactor creep compliance is the same in tension and compression and (2) if total in-reactor strain is split into irradiation growth and creep components: (a) Deviatoric hoop stress component and/or the stress difference of hoop minis radial is the driving force for irradiation creep and (b) irradiation creep in tension is the same as compression. These are the first experimental results that explicitly demonstrate the relationship between irradiation creep (or alternately plastic deformation under a neutron flux) with the deviatoric hoop stress component and/or the stress difference of hoop minis radial.


    Author Information:

    Foster, John Paul
    Fellow Engineer, Westinghouse Electric Company, Columbia, SC

    Baranwal, Rita
    Manager, Materials and Fuel Rod Design, Westinghouse Electric Company, Columbia, SC


    Stock #: JAI103297

    ISSN: 1546-962X

    DOI: 10.1520/JAI103297

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    Author
    Title ZIRLO® Irradiation Creep Stress Dependence in Compression and Tension
    Symposium 16th International Symposium on Zirconium in the Nuclear Industry, 2010-05-13
    Committee B10