You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    STP1543

    The Effects of Microstructure and Operating Conditions on Irradiation Creep of Zr-2.5Nb Pressure Tubing

    Published: 2014


      Format Pages Price  
    PDF (1.42 MB) 33 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    Abstract

    Creep experiments have been performed on biaxially stressed 10 mm diameter Zr-2.5Nb capsules. As the pressurized capsules were obtained from micro-pressure tubes, which were fabricated by the same process as CANDU power reactor pressure tubes, they have a similar microstructure to that of the full-size tubes. The experiments were performed in the OSIRIS test reactor at nominal operating temperatures ranging from 553 and 613 K in fast neutron fluxes up to 2 × 1018 n·m–2·s–1 (E > 1 MeV). Diametral and axial strains are reported as functions of fluence for specimens internally pressurized to hoop stresses from 0 to 160 MPa and irradiated to 26.5 dpa. The effects of microstructure, temperature, and cold work on irradiation creep are shown. The analysis of OSIRIS data combined with data from in-service CANDU tubes has revealed some significant observations regarding pressure tube deformation: (i) that irradiation creep anisotropy varies with temperature, (ii) texture appears to have a more significant effect on axial creep than on diametral creep, (iii) diametral strain appears to be strongly dependent on grain size and aspect ratio, and (iv) that whereas cold-work correlates with the axial creep of the capsules, there appears to be no statistically significant dependence of diametral creep on cold-work.

    Keywords:

    Zr-2.5Nb alloy, pressure tube, neutron irradiation, irradiation creep, microstructure, in-reactor deformation


    Author Information:

    Walters, L.
    Atomic Energy of Canada Limited, Chalk River Laboratories, ON, Canada

    Bickel, G. A.
    Atomic Energy of Canada Limited, Chalk River Laboratories, ON, Canada

    Griffiths, M.
    Atomic Energy of Canada Limited, Chalk River Laboratories, ON, Canada


    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP154320120158