STP1366: Comparison of Static and Dynamic Transition Temperature Shifts in VVR Reactor Pressure Vessel Steels

    Brumovsky, M
    Research Staff, Nuclear Research Institute Řež plc, Prague,

    Falcnik, M
    Research Staff, Nuclear Research Institute Řež plc, Prague,

    Kytka, M
    Research Staff, Nuclear Research Institute Řež plc, Prague,

    Malek, J
    Research Staff, Nuclear Research Institute Řež plc, Prague,

    Novosad, P
    Research Staff, Nuclear Research Institute Řež plc, Prague,

    Pages: 13    Published: Jan 2000


    Abstract

    This paper summarizes results from surveillance specimen programs of VVER-440/V-213C type reactors. Transition temperature shifts, induced by irradiation, and determined from impact Charpy V-notch toughness as well as from static fracture toughness tests on pre-cracked Charpy size specimens, (COD) are compared. Two methods have been used for determination of static fracture toughness shifts — standard COD type specimens from standard surveillance programs and reconstituted COD type specimens from broken halves of Charpy V-notch specimens; thus identical irradiation conditions have been assured. Results obtained are discussed from the point of view of irradiation conditions as well as of different type of testing. Additional tests have been performed on different heats from WER-1000 type steel, where Charpy V-notch impact and static as well as dynamic fracture toughness tests have been performed to determine transition temperature shifts. Results are discussed and show that transition temperature shifts from static tests are, generally, larger than those from dynamic tests.

    Keywords:

    reactor pressure vessel, surveillance specimen programs, static fracture toughness, transition temperature shifts, Charpy notch toughness, specimen reconstitution, VVER steels


    Paper ID: STP12381S

    Committee/Subcommittee: E10.01

    DOI: 10.1520/STP12381S


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