STP1325

    Fracture Toughness Testing of Linde 1092 Reactor Vessel Welds in the Transition Range Using Charpy-Sized Specimens

    Published: Jan 1999


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    Abstract

    The present reference toughness method for predicting the change in fracture toughness can provide over estimates of these values because of uncertainties in initial RTNDT and shift correlations. It would be preferable to directly measure fracture toughness. However, until recently, no standard method was available to characterize fracture toughness in the transition range. ASTM E08 has developed a draft standard that shows promise for providing lower bound transition range fracture toughness using the master curve approach. This method has been successfully implemented using 1T compact fracture specimens. Combustion Engineering reactor vessel surveillance programs do not have compact fracture specimens. Therefore, the CE Owners Group developed a program to validate the master curve method for Charpy-sized and reconstituted Charpy-sized specimens for future application on irradiated specimens. This method was validated for Linde 1092 welds using unirradiated Charpy-sized and reconstituted Charpy-sized specimens by comparison of results with those from compact fracture specimens.

    Keywords:

    submerged-arc welds, fracture toughness, reactor vessel, transition range, master curve, reconstituted Charpy specimens, Weibull distribution, reactor vessel surveillance program


    Author Information:

    Pavinich, WA
    Advisory Engineer, Framatome Technologies Incorporated, Knoxville, Tennessee

    Yoon, KK
    Consultant, Framatome Technologies Incorporated, Lynchburg, Virginia

    Hour, KY
    Principal Engineer, Babcock and Wilcox Co., Lynchburg, Virginia

    Hoffman, CL
    Consultant Engineer, ABB-CE, Windsor, Connecticut


    Paper ID: STP13862S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP13862S


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