RCP 입구 배관 형상에 따른 펌프 성능곡선 기울기에 대한 수치해석 연구

RCP (Reactor Coolant Pump) is the coolant circulation pump in the nuclear power plant. In general, pump is selected with a sufficient operation margin because it is controlled by the control valve. But, in the nuclear system, primary cooling system is operated without a control vale to improve the safety of the reactor. So, exact fluid system analysis is required to estimate the flow rate, pressure drop, NPSHa, slope of the performance curve and other requirements. At here, slope of the performance curve is important to ensure the normal operation during the life-time of the plant because the system curve is shifted during from the beginning of the plant to the end of plant. In the present study, Slope of the RCP performance curve is calculated based on the numerical simulation results. Two kinds of inlet pipe are used to calculate the pump performance: Straight pipe, elbow pipe. The slope of the performance curve with the straight pipe is steeper than that with the elbow pipe inlet.