STP1001

    Determination of Gamma-Ray-Induced Displacement Rates

    Published: Jan 1989


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    Abstract

    To define the gamma-ray component of the radiation field in light water reactor (LWR) pressure vessel (PV) environments, gamma-ray spectrometry experiments were conducted in the low power PV mockup at the poolside critical assembly (PCA) at the Oak Ridge National Laboratory (ORNL). Gamma-ray displacement rates can be calculated directly from absolute electron spectra observed with the Janus probe gamma-ray spectrometry. Gamma-ray displacement results are presented for the 1/4-T, 1/2-T, and 3/4-T locations of the 12/13 and 4/12 simulated surveillance capsule (SSC) configurations. In addition, the gamma-ray displacement rate at the SSC location was inferred using thermoluminescent dosimeter (TLD) gamma-ray dosimetry results obtained in the 4/12 SSC configuration at the PCA. Compared with neutron-induced displacement rates, the calculated gamma-ray-induced displacement rates are small at all these LWR-PV locations. The ratio of gamma-ray-induced to neutron-induced displacement rates never exceeds roughly 5 × 10 -3.

    Keywords:

    gamma-ray, displacement rates, light water reactor, pressure vessel surveillance


    Author Information:

    Gold, R
    Fellow Scientist, Westinghouse Hanford Company, Hanford Engineering Development Laboratory, Richland, WA

    Roberts, JH
    President, Metrology Control Corporation (MC2), Richland, WA

    Doran, DG
    Fellow Scientist, Westinghouse Hanford Company, Hanford Engineering Development Laboratory, Richland, WA


    Paper ID: STP10121S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP10121S


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