Abstract
The display variance of an on-line subcritical reactivity meter based on reactor neutron noise analysis in the domain has been investigated theoretically. The device uses the so-called “zero-crossing correlation method” and polarity correlation techniques. An algorithm is given which enables computation of the variance function of a polarity correlation function if the conditioned detector signal fluctuations are Gauss-Markovian. A comparison shows that the rms display deviations due to the polarity correlation techniques (one-bit quantization) are about 25% larger than those expected from direct correlation techniques (multi-bit quantization). This is in good agreement with results obtained from experimental investigations.
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