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


    Interactions Between Fluence Variations and Material Properties Data for Large Surveillance Capsules


      Format Pages Price  
    PDF (176K) 9 $25   ADD TO CART
    Complete Source PDF (15M) 787 $156   ADD TO CART

    Cite this document

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


    The Integrated Reactor Vessel Materials Surveillance Program of the Babcock & Wilcox Owners Group 177-fuel assembly reactor vessels uses a number of capsules that are significantly larger than those used in most surveillance programs. The larger cross section poses a problem because the specimens are grouped and cause a significant attenuation of the neutron flux through each set of specimens. In the region containing the Charpy specimens, arranged in a 4 × 4 matrix, the attenuation is approximately 40%. To minimize the attenuation, the specimens were grouped so that each row or stack was made up of specimens from one material. The specimen data were compared with unirradiated data to determine the sensitivity of the material properties to fluence variation. The arrangement of the large compact specimens permits fracture testing to propagate the crack into regions of increased embrittlement. The small amount of material involved in the testing, a result of the short distance the crack is propagated, reduces the importance of fluence attenuation. The results imply that highly accurate fluence values may not be essential to evaluating irradiated mechanical properties data.


    reactor vessel surveillance, capsules, Charpy data, fracture toughness data, neutron fluence, attenuation

    Author Information:

    Lowe, AL

    Snidow, NL
    Advisory Engineer and Principal Engineer, Babcock & Wilcox, Lynchburg, VA

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP10064S