An embodiment of a neutron flux level calculator (90) includes: an analog signal processing device (10) that amplifies an AC component of a detector output signal from a neutron detector (2) and performs a filtering of a high frequency component; a digitizing device (20) which converts, with a certain sampling period, an output signal of the analog signal processing device (10) into a digital signal in time series; a wavelet analysis device (30) that performs the discrete wavelet transform using the time series digital signal to compute a wavelet coefficient; and a digital signal processing device (40) which calculates a mean squared value of the wavelet coefficients and converts the computed average squared value into a neutron flux level value.
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