Abstract
A pressurized water reactor nuclear power unit was retrofitted to extraction steam for heating. Due to the high steam humidity, the flow regime in the extraction pipe is a complex steam-liquid two-phase flow. However, the analysis and prediction model of two-phase flow of vibration is still underdevelopment, in order to ensure the safe operation of the system, the extraction pipeline was installed with vibration monitoring instrument. It was found that the vibration at the bends was considerably high after steam extraction put into operation. The pressure fluctuation frequency before and after the valve and the TEE was analyzed by CFD, which is much different from the natural frequency of the pipeline modal analysis, concluding that the pressure fluctuation frequency is not the leading cause of pipeline vibration. The high-pressure cylinder exhaust steam has high humidity, and the amount of water drainage in the steam extraction pipe during operation is more than the empirical value. The analysis reveals that the flow in the pipeline is steam-liquid two-phase flow, and the momentum fluctuation of the two-phase flow occurs at the bends or the TEE, which is the main reason in causing the low-frequency and high-amplitude vibration of the pipeline.
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Yanhui, W., Yaping, Z., Tengfei, J. (2023). Vibration Analysis of Heating-Used Steam Extraction Pipelines in Nuclear Power Plant. In: Liu, C. (eds) Proceedings of the 23rd Pacific Basin Nuclear Conference, Volume 3. Springer Proceedings in Physics, vol 285. Springer, Singapore. https://doi.org/10.1007/978-981-19-8899-8_48
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DOI: https://doi.org/10.1007/978-981-19-8899-8_48
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