| 摘要 |
PROBLEM TO BE SOLVED: To estimate a main parameter affecting a reactor core dynamic characteristic such as a void reactivity coefficient, and a noise source causing a steady state fluctuation, from time to time, without imparting disturbance to a plant under an operation, so as to be utilized for monitoring a reactor core. SOLUTION: A statistical feature amount is found by frequency analysis, based on fluctuation components of a neutron flux signal and a reactor core flow rate signal of a boiling water nuclear reactor, a theoretical value of the statistical feature amount is found by assuming the plurality of noise sources in a dynamic characteristic model of the reactor core of the boiling water nuclear reactor, a level of the parameter or the noise source in the dynamic characteristic model to minimize a difference between the statistical feature amount and the theoretical value of the statistical feature amount, and the level of the parameter or the noise source is used for the monitoring. COPYRIGHT: (C)2005,JPO&NCIPI
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