243 蒸気実験による分岐管部での音響共鳴現象の評価

概要

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In U.S. boiling water reactor (BWR), the steam dryer had been damaged by high cycle fatigue due to acoustic-induced vibration under a 17% extended power uprating condition. The cause of that was considered as flow induced acoustic resonance at the stub pipes of safety relief valve (SRV) in the main steam lines. Increased velocity by uprating excites the pressure fluctuations and makes large amplitude resonance. To evaluate the acoustic resonance at the stub pipes of SRVs in actual BWR, it is necessary to clarify the acoustic characteristics in steam flow. Although there are several previous studies about acoustic resonance, most of them are not steam flow but air flow. Therefore in this study, to investigate the acoustic characteristics in steam flow, we conducted steam flow experiments in dry steam conditions, and also in air flow. We measured pressure fluctuation at the top of the single stub pipe and in main steam piping. As a result, it is clarified that acoustic resonance in dry steam flow could be evaluated as same as that in air flow.
2011-09-05