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    STP1011

    Neutron Embrittlement Surveillance Program at Krṡko Nuclear Power Plant

    Published: 0


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    Abstract

    Presented are results of the testing of the first surveillance capsule of the Kṡsko Nuclear Power Plant. The plant is a 632-MWe two-loop pressurized water reactor (PWR). The pressure vessel is made of low-copper steel. The projected lifetime neutron exposure of the pressure vessel is 6 ∙ 1019 n/cm-2E > 1 MeV. The first surveillance capsule was irradiated to 1.75 effective full power year (EFPY). The neutron exposure of irradiated specimens was between 7.4 to 9.4 ∙ 1018 n/cm2 E > 1 MeV depending on specimen positions. Observed ▵RTNDT are higher than given by predictive formulas for all except base material in transverse direction. The ratio observed versus predicted for weld was found to be 2 and 5 in the case of Regulatory Guide 1.99, Revision 1 and Revision 2, respectively. Observed change in the upper shelf energy is of the order of a few percent and is hidden by the spread in measured values.

    Keywords:

    light water reactor (LWR), pressure vessel surveillance, RT, NDT, shifts, neutron embrittlement


    Author Information:

    Najzer, M
    Head, Reactor Physics Department, research associate, and research assistant, J. Stefan Institute, Ljubljana,

    Glumac, B
    Head, Reactor Physics Department, research associate, and research assistant, J. Stefan Institute, Ljubljana,

    Kodeli, I
    Head, Reactor Physics Department, research associate, and research assistant, J. Stefan Institute, Ljubljana,


    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP10388S