STP1502

    Application of Subsize Specimens for Re-Irradiation Embrittlement Monitoring of the First Generation of VVER-440 RPV Steels

    Published: Jan 2009


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    Abstract

    The first generation of VVER-440 Units were not supplied with RPV steel surveillance programs. Therefore, cutting out of samples (tem-pletes) from the inner side of RPV wall is the only possibility for re-irradiation embrittlement monitoring of the first generation of VVER-440 RPV steels. Calculations showed that it is possible to cut out a sample of 7×60×95 mm (with consequent repair) from a RPV core weld. Thus, it is impossible to machine the standard 10×10×55 mm Charpy V-notch specimens to determine RPV steel radiation embrittlement. Therefore it is necessary to use subsize specimens (5×5×27.5 mm and 3×4×27 mm) for ductile-to-brittle transition temperature evaluation of templet material. The small samples were cut out from the inner surface of the all old Russian VVER-440 RPVs to assess the actual condition of the RPV material before and after post-irradiation annealing and after re-irradiation. Special monitoring programs of periodic sampling of RPVs and re-irradiation of the templet material in surveillance channels of VVER-440∕213 RPVs were developed. The state of the art of application of subsize specimens for re-irradiation embrittlement monitoring of the first generation of VVER-440 RPV steels is discussed.

    Keywords:

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


    Author Information:

    Shtrombakh, Ya. I.
    Director, Lab Head and Senior Research Scientist, Russian Research Center “Kurchatov Institute,” IRMT, Moscow,

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

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


    Paper ID: STP48724S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP48724S


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