Impact of flow induced vibration acoustic loads on the design of the Laguna Verde unit 2 steam dryer.

Forsyth, David R.
Wellstein, Leslie F.
Theuret, Robert C.
Rajakumar, Charles
Yan Han
Amador Cabrera, César
Sosa Flores, Wendy

2015

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Industry experience with Boiling Water Reactors (BWRs) has shown that increasing the steam flow through the main steam lines (MSLs) to implement an extended power uprate (EPU) may lead to amplified acoustic loads on the steam dryer, which may negatively affect the structural integrity of the component. The source of these acoustic loads has been found to be acoustic resonance of the side branches on the MSLs, specifically, coupling of the vortex shedding frequency and natural acoustic frequency of safety relief valves (SRVs). The resonance that results from this coupling can contribute significant acoustic energy into the MSL system, which may propagate upstream into the reactor pressure vessel steam dome and drive structural vibration of steam dryer components. This can lead to high-cycle fatigue issues. Lock-in between the vortex shedding frequency and SRV natural frequency, as well as the ability for acoustic energy to propagate into the MSL system, are a function of many things, including the plant operating conditions, geometry of the MSL/SRV junction, and placement of SRVs with respect to each other on the MSLs.

Artículo presentado en el XXVI Congreso Anual de la Sociedad Nuclear Mexicana. XIV Congreso Nacional de la Sociedad Mexicana de Seguridad Radiológica. Puerto Vallarta, Jalisco, México, del 5 al 8 de Julio de 2015.

Agua; Energía Eléctrica; Reactores Nucleares;