STP1550

    Comparison of Attenuation Coefficients for VVER-440 and VVER-1000 Pressure Vessels

    Published: Aug 2012


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    Abstract

    The paper summarizes the attenuation coefficient of the neutron fluence with E > 0.5 MeV through a reactor pressure vessel for vodo-vodyanoi energetichesky reactor (VVER) reactor types measured and/or calculated for mock-up experiments, as well as for operated nuclear power plant (NPP) units. The attenuation coefficient is possible to evaluate directly only by using the retro-dosimetry, based on a combination of the measured activities from the weld sample and concurrent ex-vessel measurement. The available neutron fluence attenuation coefficients (E > 0.5 MeV), calculated and measured at a mock-up experiment simulating the VVER-440-unit conditions, vary from 3.5 to 6.15. A similar situation is used for the calculations and mock-up experiment measurements for the VVER-1000 RPV, where the attenuation coefficient of the neutron fluence varies from 5.99 to 8.85. Because of the difference in calculations for the real units and the mock-up experiments, the necessity to design and perform calculation benchmarks both for VVER-440 and VVER-1000 would be meaningful if the calculation model is designed adequately to a given unit.

    Keywords:

    reactor pressure vessel, VVER-440, VVER-1000, attenuation coefficient


    Author Information:

    Marek, Milan
    Reactor Physics Dept., Research Centre Rez,

    Rataj, Jan
    Reactor Physics Dept., Research Centre Rez,

    Vandlik, Stanislav
    Reactor Physics Dept., Research Centre Rez,


    Paper ID: STP155020120004

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP155020120004


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