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

NUCLEAR ENGINEER

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

TIAN Wenxi，

SU Guanghui，

WANG Gaopeng，

QIU Suizheng，

XIAO Zejun

Nuclear Science and Techniques

Vol.20, No.2

pp.118-123

Published in print 20 Apr 2009

DOI：10.13538/j.1001-8042/nst.20.118-123

41705

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 alternate 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 alternate 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.

Water hammerCheck valve slammingMethod of characteristicInertia-type valve model

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