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Incore monitoring method and incore monitoring equipment

  • US 20030128793A1
  • Filed: 09/27/2002
  • Published: 07/10/2003
  • Est. Priority Date: 09/27/2001
  • Status: Active Grant
First Claim
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1. An incore monitoring method of a nuclear reactor, comprising:

  • measuring neutron flux levels at a plurality of pitch levels corresponding to a plurality of local power range monitor sensors arranged in an axial direction inside a detector assembly installed in the nuclear reactor;

    performing a power distribution calculation using a three-dimensional simulation to obtain a first calculation of thermal characteristics of a fuel assembly group consisting of fuel assemblies adjacent to the corresponding detector assembly, based on values indicated by the plurality of local power range monitor sensors of the corresponding detector assembly at a first time;

    performing a plurality of second calculation of thermal characteristics in which the power distribution calculation is not performed, based on values indicated by the plurality of local power range monitor sensors at second times, subsequent to the first time, and based on the thermal characteristics calculated in the first calculation at the first time; and

    monitoring the plurality of thermal characteristics calculated in the second calculation.

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