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核电厂运行工况下,反应堆压力容器(RPV)上部堆内支承构件处在一个高速的横向流流场中。在横向流作用下,RPV上部堆内支承构件产生明显的振动。这类振动行为体现在涡旋导致的结构振动和流弹不稳定。研究RPV上部堆内支承构件在横向流作用下的振动行为特性,并根据ASME规范对其进行流致振动分析评定。研究结果表明:特定结构在冷启堆或冷停堆时更容易产生流致振动,而非在满功率运行工况下。
In the operating condition of a nuclear power plant, the upper support member in the reactor pressure vessel (RPV) is in a high-speed lateral flow field. Under lateral flow, significant vibrations are generated in the supporting components in the upper RPV stack. This kind of vibration behavior is reflected in the vortex structure vibration and instability of the projectile. The vibration behavior characteristics of RPV supporting members in the upper part of the RPV under transverse flow were studied and the flow vibration analysis was conducted according to the ASME code. The results show that specific structures are more prone to flow induced vibration at cold restart or cold shutdown than at full power operation.