| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature reactivity measuring separate measuring method capable of measuring separately a temperature reactivity coefficient of a pressurized water reactor, grasping accurately an operation characteristic, and contributing to safety of an operation by loading of a new type fuel such as a MOX fuel. SOLUTION: An isothermal reactivity coefficient in the zero output critical state of the pressurized water reactor is measured, and a reactor output is raised by a prescribed quantity by external reactivity addition from the zero output critical state, and then an external addition reactivity, a neutron reactor outside detector response, and a time response of a coolant inlet temperature and a coolant average temperature are observed and stored as time series data. Then, the neutron reactor outside detector response is inputted into a reactivity meter to determine a reactivity time response and stored as time series data, and the isothermal reactivity coefficient and the time series data are subjected to Fourier transform, and the result is substituted for a prescribed frequency response transfer function, and a Doppler reactivity coefficient satisfying the response relation is determined by least square fitting. COPYRIGHT: (C)2006,JPO&NCIPI
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