Abstract
In the LMFBR, electromagnetic-flowmeters (EMFs) have been extensively used. A calibration method using cross-correlation of the output voltage fluctuations of EMF has been proposed. The correlation method requires two pairs of electrodes, so is desired to develop and alternative method without this requirement. In the present paper, the process by which the turbulent behavior of a fluid in a pipe is transformed into the output voltage fluctuation is considered. From this, the root mean square frequency weighted by the autopower spectrum density of the voltage fluctuation is developed as a function of the flow rate. The root mean square frequency is proportional to the product of the flow rate and the square root of the friction coefficient of the pipe, and the relationship between the root mean square frequency and the flow rate is not linear contrary to prior belief because the friction coefficient is a function of the flow rate. Then, if proportional coefficient has been obtained, the flow rate is determined by measuring the root mean square frequency. Though the experiment conducted with a 12B saddle coil type EMF in the primary cooling system of JOYO, the first experimental fast reactor in Japan, indicated some difference in the proportional coefficient from the calculation, the performance degradation of the EMF could be calibrated within 3.6 % of the accuracy provided that the coefficient was obtained experimentally in advance.
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