CFD Simulation on Flow Induced Vibrations in High Pressure Control and Emergency Stop Turbine Valve
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
A7-2 Mini Symposium on Flow-induced Vibration in Nuclear Components

Hans Lindqvist (Forsmarks Kraftgrupp AB)


During the refuelling outage at Unit 2 of Forsmark NPP in 2009, the high pressure turbine valves were replaced. Three month after recommissioning, an oil pipe connected to one of the actuators was broken. Measurements showed high-frequency vibration levels. The pipe break was suspected to be an effect of highly increased vibrations caused by the new valve. In order to establish the origin of the vibrations, investigations by means of CFD-simulations were made. The simulations showed that the increased vibrations most likely stems from the open cavity that the valves centre consists of.

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