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    STP1502

    Using Subsize Impact Bend Specimens for Estimation of Irradiation and Re-Irradiation Embrittlement of VVER RPV Steels

    Published: Jan 2009


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    Abstract

    Results of impact bend tests of subsize Charpy V-notch-type (CVN) specimens are used in Russia for monitoring both re-irradiation embrittlement of the first generation of VVER-440 (including VVER-440∕179 and VVER-440∕230, i.e., projects B-179 and B-230) reactor pressure vessel (RPV) steels and irradiation embrittlement of VVER-440∕213 RPV steels. For the first generation of VVER-440 RPVs, no surveillance program was foreseen and only subsize specimens (5 by 5 by 27.5 mm and 3 by 4 by 27 mm) can be manufactured from samples taken from the inner surface of the RPV for radiation embrittlement monitoring. For VVER-440∕213 RPVs, 80 % of the surveillance specimens are irradiated with a lead factor greater than 20. Only four specimens of base metal and four specimen halves of weld seam material are irradiated with a lead factor less than 3. Taking into account that full-size (10 by 10 by 55 mm) CVN specimens were used in surveillance programs, using subsize specimens enables to solve the flux effect problem for VVER-440∕213 RPV beltline materials and ensure representativity of surveillance programs. Application of subsize specimens for the estimation of radiation embrittlement requires developing a correlation between transition temperature values evaluated using test results of standard (full-size) and subsize CVN specimens. Such a correlation is discussed.

    Keywords:

    reactor pressure vessel, radiation embrittlement, ductile-to-brittle transition temperature, subsize impact bend specimens, specimen reconstitution


    Author Information:

    Nikolaev, Yu. A.
    Lab Head and Senior Research Scientist, Russian Research Center “Kurchatov Institute,” IRMT, Moscow,

    Nikolaeva, A. V.
    Lab Head and Senior Research Scientist, Russian Research Center “Kurchatov Institute,” IRMT, Moscow,


    Committee/Subcommittee: E10.01

    DOI: 10.1520/STP48722S


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