According to one embodiment, a stability computation monitoring device monitors in real time reactor power oscillation based on signals from neutron detectors. The device has: a detection sampling section sampling signals from the plurality of neutron detectors to output a detection sampling signal for each neutron detector; a local power monitoring section converting the detection sampling signal into a neutron flux signal; a low-pass filter applying low-pass filtering to neutron flux signal; a down-sampling section performing down-sampling for the neutron flux signals that have passed through the low-pass filter at a period longer than the detection sampling period; a wavelet transformation section applying Discrete Wavelet transformation to the neutron flux signals that have been subjected to the down-sampling to compute a DWT wavelet coefficient of each level; and a monitoring section monitoring the wavelet coefficient computed by the wavelet transformation section.
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