Method of in-service calibration of electromagnetic-flowmeter for LMFBR utilizing average frequency of output voltage fluctuation.

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概要

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• In the LMFBR, electromagnetic-flowmeters (EMFs) have been extensively used. A calibra-tion method for EMF using cross-correlation of its output voltage fluctuations has been pro-posed. This method, however, requires two pairs of electrodes, and it is desired to develop an alternative method without this requirement.<BR>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 ; and the average frequency weighted by the square root of the autopower spectral density of the fluctuation is developed as a function of the flow rate. The average frequency is proportional to the product of the flow rate and the square root of the friction coefficient of the pipe. Consequently, the flow rate is determined by measuring the average frequency, once the proportional coefficient is obtained.<BR>The experiment was conducted with a 12 in. diameter saddle coil type EMF in the primary cooling system of "JOYO" reactor. Though the experimental value of the propor-tional coefficient was somewhat deviated from the calculated one, it is concluded that the performance degradation of the EMF can be calibrated with an accuracy of 12% error.

• 一般社団法人 日本原子力学会の論文

著者

• ENDOU Akira

  Experimental Fast Reactor Division, Oarai Engineering Center, Power Reactor and Nuclear Fuel Development Corp.

関連論文

• Method of in-service calibration of electromagnetic-flowmeter for LMFBR utilizing average frequency of output voltage fluctuation.

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