原子力発電給水流量計校正のための高レイノルズ数実流校正設備 : 設備の概要および特性(流体工学,流体機械)

概要

論文の詳細を見る
Since 1990s, an uprate of the thermal output has been carried out in USA using a method of measurement uncertainty recapture called as MUR. The principle of the MUR method is based on reduction of the measurement uncertainty of the feedwater flow rate using an ultrasonic flowmeter with high accuracy. Since the measurement uncertainty of thermal output can be reduced using that flowmeter, the thermal output can be increased within the reducing value of the uncertainty. The ultrasonic flowmeter using in a feedwater loop should be calibrated under the same condition of a nuclear power plant because of the correction factor of it is strongly affected by the condition of the flow field such as Reynolds number. To realize an actual flow calibration of feedwater flowmeter used at nuclear power stations at Reynolds numbers of up to 18 million, a new test facility is constructed at National Metrology Institute of Japan (NMIJ). This very large Reynolds number is achieved at a flow rate of 12000 m^3/h and water temperature of 70℃ in a 600 mm pipe. Then the pipe prover system for 750 m^3/h is also constructed to confirm of the temperature effect on the flowmeters. This paper describes overview and characteristic of the new facility.
2008-02-25