HFETR二次水超声波流量偏小原因分析

Small Measurement Cause Analysis for HFETR Second Coolant Ultrasonic Flow

在设备运行中发现HFETR二次冷却水超声波流量计测量值比文丘里式流量计偏低。为了满足冗余性、多样性的设计原则,对HFETR二次冷却水设计了两套不同原理的流量测量装置。从超声波流量计的原理分析出由于HFETR二次水含沙量高,造成声波传播速度比理想情况下水中的传播速度高,使超声波流量计测量的流量偏低。通过引入修正因子可以消除偏差。

It was found that the measured value of ultrasonic flowmeter is lower than that of Venturi flowmeter on the HFETR second coolant during the equipment operation. In order to satisfy the design philosophy of redundancy and diversity, two sets of flow measurement devices with different principle for HFETR second coolant were designed. Through the analysis from the princi- ple of ultrasonic flowmeter, because HFETR second coolant sediment concentration is high, resulting in sound propagation speed is higher than the propagation speed of sound in water under ideal conditions, making ultrasonic flowmeter flow measurement is low.Deviation can be eliminated by introducing correction factor.