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Title: Experimental Study On Cavitating Venturi For Preventing Severe Accidents In Nuclear Power Plants
Author: Ki Won Lim, Jaeheun, Rho
Source: 2009 International Symposium on Fluid Flow Measurement
Year Published: 2009
Abstract: When a severe accident occurs in a nuclear reactor, a sufficient amount of water must be supplied to prevent a steam explosion. A water volume of 1135 m3 must be supplied at a rate in the range of 122 m3 / h to 170 m3 / h to stabilize the system. However, high steam pressure in the steam generator (SG) causes difficulty in supplying an appropriate volume of water. Use of a Cavitating Venturi (CV) allows a liquid flowrate to be fixed. This flowrate is independent of downstream pressure. If choking occurs in the liquid flow, downstream pressure changes cannot be transmitted through the barrier, and only an upstream pressure can increase the flowrate. However, the collapse of the vapor cavity generates severe noise and also causes pipe vibration, which destroys the piping and destabilizes operation. In this study, a designed CV is proposed for reducing the noise and the pipe vibration. Testing was carried out in the range of 54 m3 / h to 148 m3 / h under practical conditions. The noise generated from the bubble collapse was measured as from 94 dBA to 123 dBA with the tested flowrates. According to the experimental results, the designed CV showed improved characteristics for stable operation of a nuclear power plant.

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