Volume 3, Issue 6 (June 2006)

    Evaluation of Diamond Detectors for Fast Neutron Fluence Measurements in WWER-1000 Surveillance Assemblies

    (Received 20 June 2005; accepted 19 April 2006)

    Published Online: 2006

    CODEN: JAIOAD

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    Abstract

    The commonly used method of WWER-1000 surveillance dosimetry is based on the measurement of 54Mn absolute activity in the material of surveillance specimens. Special procedures are necessary for the determination of the spectral index for each specimen, which depends on surveillance assembly orientation in the reactor during the irradiation period, and for fluence extrapolation beyond several 54Mn half-life periods taking into account the detailed local power history in the core periphery. The application of the diamond detectors technique is proposed as an alternative method of fast neutron fluence determination. These detectors are located in the surveillance containers as irradiation temperature monitors. The diamond lattice extends under the influence of neutron irradiation, and it allows the fluence measurements after corresponding calibration. The calibration of diamond detectors was carried out using fluence data for 123 surveillance containers irradiated in different WWER-1000 reactors for different fluences. Some results of fluence measurements carried out by two methods are compared.


    Author Information:

    Nikolaenko, VA
    Head of Group, Head of Department, and Staff Scientist, Russian Research Center Kurchatov Institute, Moscow,

    Zaritsky, SM
    Head of Group, Head of Department, and Staff Scientist, Russian Research Center Kurchatov Institute, Moscow,

    Bachuchin, IV
    Head of Group, Head of Department, and Staff Scientist, Russian Research Center Kurchatov Institute, Moscow,


    Stock #: JAI13437

    ISSN: 1546-962X

    DOI: 10.1520/JAI13437

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    Author
    Title Evaluation of Diamond Detectors for Fast Neutron Fluence Measurements in WWER-1000 Surveillance Assemblies
    Symposium Reactor Dosimetry, 12th International Symposium, 2005-05-23
    Committee E10