Scaling Laws for Model Test Based BWR Steam Dryer Fluctuating Load Definitions

Sommerville, Daniel

doi:10.1115/pvp2006-icpvt-11-93703

Cited by 3 publications

(2 citation statements)

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“…Howe 6) showed that the fluctuating pressure was proportional to u 3 =a (a, speed of sound) when there was a dipole acoustic source. Sommerville 7) applied the scale model to investigate flow-induced acoustic resonance at SRV stub pipes and showed that the fluctuating pressure was proportional to a 2 under the resonance condition. 7) In this study, u 2 =2 was applied to normalize the fluctuating pressure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Acoustic- and Flow-Induced Vibration of the BWR Main Steam Lines and Dryer

Morita

Takahashi

Okuyama

et al. 2011

Journal of Nuclear Science and Technology

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The boiling water reactor (BWR-3) steam dryer in the Quad Cities (QC) Unit 2 Nuclear Power Plant was damaged by high-cycle fatigue due to acoustic-induced vibration. The cause of the dryer failure was considered as flow-induced acoustic resonance at the stub pipes of the safety relief valve (SRV) in the main steam lines (MSLs). The acoustic resonance was considered to be generated by the interaction between the sound field and an unstable shear layer across the closed side branches of SRVs. We have started a research program on BWR steam dryers to develop methods of evaluating the loading. Moreover, it is necessary to evaluate the dryer integrity of BWR-5 plants, which are the main type of BWR in Japan.In the present study, we conducted 1/10-scale BWR model tests and analysis to investigate the flowinduced acoustic resonance and acoustic characteristics in MSLs. The test apparatus consisted of a steam dryer, a steam dome, and 4 MSLs with 20 SRV stub pipes. Computational fluid dynamics (CFD) analysis was conducted to evaluate the acoustic source in MSLs. Finite element method (FEM) was applied to calculate the three-dimensional wave equations for acoustic analysis. We demonstrated that large fluctuating pressure occurred in the high-and low-frequency regions. The high-frequency fluctuating pressure was generated by the flow-induced acoustic resonance in the SRV stub pipes. We evaluated the acoustic source (that is, the fluctuating pressure) in MSLs by unsteady CFD calculations, and we evaluated the pressure propagation by acoustic analysis. These results were verified by comparison with the results of scale-model tests, and they showed good agreement with the experimental results. The effects of the difference between the properties of air and steam were numerically investigated, and it was found that the effects on the acoustic resonance in the SRV stub pipes were not significant.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Acoustic- and Flow-Induced Vibration of the BWR Main Steam Lines and Dryer

Morita

Takahashi

Okuyama

et al. 2011

Journal of Nuclear Science and Technology

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“…The detailed inspection of the stem dryer showed that it was likely that the steam dryer had been damaged by high cycle fatigue due to acoustic-induced vibration [1,2]. The cause of the dryer's failure was considered as flow-induced acoustic resonance at the stub pipes of the safety relief valves (SRVs) on the main steam lines (MSLs).…”

Section: Introductionmentioning

confidence: 99%

Numerical and Theoretical Study on Parameter Selection of Acoustic Load Test of Steam Dryer

Zhang

Wang

et al. 2016

Volume 3: Thermal-Hydraulics

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In recent years some reactors have experienced significant steam dryer cracking. The cause of the dryer's failure was considered as flow-induced acoustic resonance at the stub pipes of the safety relief valves (SRVs) on the main steam lines (MSLs). A research program was started to investigate the acoustic resonance of the steam dryer. Most studies used scaled down method, while our research based on the full scale steam dryer of the prototype CAP1400 but with only one unit of the steam dryer. The purpose of our research program is to study the strength of the steam dryer under flow-induced acoustic resonance. This paper introduces the parameter selection of the main pipe and the stub pipe through numerical method and theoretical method.

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