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김민(Min Kim),정장규(Chang-Kyu Chung),김은기(Eun-Kee Kim),노태선(Tae-Sun Ro),이성노(Soung-No Lee),유성연(Seong-Yeon Yoo) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
The letdown system of pressurized water reactor (PWR) nuclear power plants had experienced instabilities in letdown system due to unacceptable flow characteristics of control valves. The Korean Standard Nuclear Power Plants (KSNPs) have three flow paths in parallel for letdown flow control. Each flow path consists of two orifices and one isolation valve. This study evaluates the effect of orifice arrangement and valve stroke time of letdown isolation valve on the system transients because sudden flow changes due to valve actuation can generate high pressure peaks in letdown line. A pressure transient analysis has been preformed to evaluate the impact of dynamic transients. This analysis uses MMS which is a simulation code developed by EPRI based on the method of characteristics. The result shows that the pressure peak is reduced in the continuous arrangement but negligible. Additionally, it shows that the stroke time of linear type plug valve greater than 15 seconds can give more stable performance.