A new method for evaluating three-dimensional power distribution in a nuclear reactor core is developed, which is suitable for on-line core performance calculation and useful for economical, safe operation of a nuclear power station. This method is based upon the numerical calculation of power distribution by a coupled nuclear-thermalhydraulic code equivalent to " FLARE ''(l), the well established three-dimensional boiling water reactor simulator. The calculated power distribution is then corrected to make it consistent with the neutron flux distribution measured by ion chambers (LPRM) placed in various parts of the core region.
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