STP1228

    Analysis of PWR Pressure Vessel Surveillance Dosimetry with McBend

    Published: Jan 1994


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    Abstract

    Fast fluences received by four surveillance capsules in two 900-MWe PWR have been calculated with the Monte Carlo transport program MCBEND and compared with values estimated from activation measurements. First comparisons between calculation (C) and experiment (E) gave C/E values equal to 0.98/0.97/0.98/0.90. The original experimental values were based on saturation activation rates obtained from the measured activities and from the reactor power history, assigning at each operation cycle a contribution proportionnal to its time-integrated power production. A revision was then carried out in order to inlcude the effects of the fuel loadings (low leakage or out-in) in the contribution of each cycle. The revised experimental values led to C/E equal to 0.98/1.00/1.00/0.99, thus considerably reducing the scatter, and confirming the suitability of MCBEND to provide an essentially unbiassed approximation of the fast flux at the level of the surveillance capsules.

    Keywords:

    light water reactor, pressure vessel, surveillance, fast fluence


    Author Information:

    de Wouters, RM
    Neutronics Group Manager and engineer, Tractebel Energy Engineering,

    Laurent, DJ
    Neutronics Group Manager and engineer, Tractebel Energy Engineering,

    D'Hondt, PJ
    Head of Fuel Research Division, CEN-SCK,


    Paper ID: STP15104S

    Committee/Subcommittee: E10.01

    DOI: 10.1520/STP15104S


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