STP1228

    Pressure Vessel Fluence Monitoring at NPP with VVER: Routine Technique and New Approaches

    Published: Jan 1994


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    Abstract

    For Reactor Pressure Vessel (RPV) neutron fluence monitoring at a nuclear power plant (NPP) with VVER-type reactor the Russian Nuclear Regulatory Body (GOSATOMNADZOR) has recently recommended use of the ex-vessel cavity dosimetry combined with neutron transport calculations. By using activation dosimeters with long-lived reaction products on the base of 54Fe, 58Ni, 46Ti, 60Ni, 63Cu, 55Mn and 59Co the routine experiments are now carried out. The WER cavity dosimetry methodology has been developed on the basis of experimental results obtained at Rovno NPP Unit 1 (Ro-1), Unit 2 (Ro-2), Unit 3 (Ro-3), Novovoronezh NPP Unit 5 (NV-5), Yuzhno-Ukrainsk NPP Unit 1 (YuU-1) with VVER-440 and VVER-1000. The set of experiments has been performed during the various reactor fuel cycles including the low leakage core. More accurate evaluation of integral neutron spectrum in cavity is possible by using short-time irradiations of the dosimeters with short-lived reaction products. Now performing cavity experiments also include 237Np, 238U and 93Nb detectors. The track detectors, similar SSTR, may be used for cavity dosimetry, and now such set dosimeters are available for installation in cavities of some VVERs. Also the “on-line” fluence monitoring technique is now developed. A summary of experimental and calculational results is presented.

    Keywords:

    pressure vessel, neutron fluence, VVER-type reactor, experiment, calculation, activation detector, reaction rate, neutron spectrum


    Author Information:

    Borodkin, GI
    Scientific and Engineering Nuclear and Radiation Safety Center (NRS SEC) of Russian GOSATOMKADZOR, Moscow,

    Kovalevich, OM
    Scientific and Engineering Nuclear and Radiation Safety Center (NRS SEC) of Russian GOSATOMKADZOR, Moscow,

    Lomakin, SS
    Scientific and Engineering Nuclear and Radiation Safety Center (NRS SEC) of Russian GOSATOMKADZOR, Moscow,

    Sycheva, NV
    Scientific and Engineering Nuclear and Radiation Safety Center (NRS SEC) of Russian GOSATOMKADZOR, Moscow,


    Paper ID: STP15097S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP15097S


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