Abstract
The aim of this paper is to review a basic detection method which concerns with temperature fluctuation in upper core region. The measurement of small temperature fluctuation, which may be masked by bulk temperature variation, was carried out by obtaining two small frequency signal components using one thermocouple and a band pass filter systems after eliminating a large signal component. From the signal processing, typical PSD pattern changes were observed according to temperature fluctuation of the coolant. Obtained experimental results are discussed by comparing with theoretical estimation.
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