This paper presents applicability of the extended Feynman-a correlation method to reactor power measurement. In the extended method, higher-order difference filters are implemented and dead-time effect of neutron counter is considered. A series of the correlation measurements were performed in the UTR-KINKI reactor to demonstrate the applicability of the extended method. At a critical state, the reactor power inferred from saturated correlation amplitude is consistent with indication of linear power monitor of the reactor. At subcritical states, not only the correlation amplitudes but also the subcriticality of these states require for the determination of reactor power. In prompt decay constants and subcriticalities obtained from the constants, detector-position dependence, i.e., spatial effect has significantly observed. These subcriticalities have also led to the significant spatial dependence of the reactor power inferred. When reference subcriticalities determined from source jerk experiment have employed instead of the spatially dependent subcriticalities, the inferred reactor power has slight spatial dependence and agrees with indication of linear power monitor.
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