,Mitigating check valve slamming and subsequentwater hammer events for PPFS using MOC

• 作 者: TIAN Wenxi SU Guanghui WANG Gaopeng QIU Suizheng XIAO Zejun
• 机 构: State Key Laboratory of Multiphase Flow in Power Engineering, Department of Nuclear Science and Tech
• 出 处: 核技术(英文版)
• 发表日期: 2009年2期
• 关键词: Water hammer Check valve slamming Method of characteristic Inertia-type valve mo

The method of characteristic (MOC) was adopted to analyze the check valve-induced water hammer behaviors for a Parallel Pumps Feedwater System (PPFS) during the alteate startup process. The motion of check valve disc was simulated using inertial valve model. Transient parameters including the pressure oscillation, local flow velocity and slamming of the check valve disc etc. have been obtained. The results showed that severe slamming between the valve disc and valve seat occurred during the alteate startup of parallel pumps. The induced maximum pressure vibration amplitude is up to 5.0 MPa. The scheme of appending a damping torque to slow down the check valve closing speed was also performed to mitigate of water hammer. It has been numerically approved to be an effective approach.