抄録
The economic advantages of a chordal ultrasonic feedwater flow measurement system over conventional (flow nozzle-based) feedwater instrumentation are analyzed for new plants having ratings ranging from 1100 MWe to 1600 MWe. Specifically, each of the following topics is considered: ・The value of a 1.7% increase in the rating of the new plant, made possible by the reduced uncertainty in the determination of thermal power. ・The value of reduced startup time owing to enhanced steam supply water level control. ・The value of the reduced feedwater pumping power brought about by the elimination of flow nozzles. ・The value of the reduced calibration burden owing to the elimination of the feedwater flow differential pressure transmitters and resistance thermometers ・The net difference in the acquisition costs of the ultrasonic system versus conventional feedwater flow instrumentation. ・The net savings in installation costs of the ultrasonic system vis-a-vis conventional feedwater flow instrumentation. ・The potential savings in outage time due to the reduced frequency of low steam supply water level trips (scrams) of the reactor.
