S0802-2-5 米国ALDEN CALIBRATION LOOPにおける超音波流速分布流量計による原子炉給水相当配管での流量計測試験(原子力システムおよび要素技術(2))

概要

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The flow rate measurement based on ultrasonic flow-velocity profiling enables us to accurately measure flow rates on site, eliminating the effects of the variations of flow-velocity profile. The ultrasonic flow-profile velocimetry flowmeter exhibits the great advantage, compared with conventional time-of-flight (TOF) ultrasonic flowmeters that are inevitably affected by a profile factor (PF). The ultrasonic flow-profile velocimetry flowmeter showed that the deviations to the national standard values were less than 〜0.2% on 100A and 200A pipes at the U.S. NIST and CENAM in Mexico. The measurement tests were carried out on 500A pipe with Sch-80 corresponding to a BWR feedwater line at the Alden Calibration Loop in the United States for the purpose of the application to the LWR uprate by MUR (Measurement Uncertainty Recapture). The ultrasonic flow-profile velocimetry flowmeter exhibited the same degree of accuracies of the results at NIST and CENAM of the national standards for the case of a large-size pipe in diameter and thick pipe wall as used in LWR feefwater lines.
一般社団法人日本機械学会の論文
2010-09-04