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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제48권 제1호
발행연도
2016.1
수록면
98 - 113 (16page)

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A reactor vessel level monitoring system measures the water level in a reactor duringnormal operation and abnormal conditions. A drop in the water level can expose nuclearfuel, which may lead to fuel meltdown and radiation spread in accident conditions. A levelmonitoring system mainly consists of a sensing line and pressure transmitter. Over aperiod of time boron sediments or other impurities can clog the line which may degradethe accuracy of the monitoring system. The aim of this study is to determine blockage in asensing line using the energy of the composite signal. An equivalent Pi circuit model isused to simulate blockages in the sensing line and the system's response is examinedunder different blockage levels. Composite signals obtained from the model and plant'sunblocked and blocked channels are decomposed into six levels of details and approximationsusing a wavelet filter bank. The percentage of energy is calculated at each level forapproximations. It is observed that the percentage of energy reduces as the blockage levelin the sensing line increases. The results of the model and operational data are wellcorrelated. Thus, in our opinion variation in the energy levels of approximations can beused as an index to determine the presence and degree of blockage in a sensing line.

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