Evaluation of Vibration and Vibration Fatigue Life for Small Bore Pipe in Nuclear Power Plants
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摘要: 根据美国机械工程师标准(ASME-OM-S/G2000)规范及法国电力公司(EDF)标准振动评估方法,提出一套用于核电站小支管振动评估及振动疲劳寿命分析的方法,应用该方法对国内某核电站汽轮机润滑顶轴盘车(GGR)系统的辅助小支管振动问题进行评估研究,并计算了小支管系统的允许有效速度。根据振动速度的测量和计算结果进行敏感性评估;采用响应谱计算方法对管座处的应力水平进行计算,并与允许振动交变应力进行比较;采用瞬态动力学方法对管座处的应力时程响应进行计算,根据Miners线性损伤累积模型对管座的振动疲劳寿命进行评估。结果表明谱响应计算得到的振动交变应力幅值高于评估准则的振动交变应力允许值,该管线属于振动敏感管线;而通过瞬态振动寿命计算得到稳态振动疲劳寿命远远高于设计寿命,有较大的安全裕量。Abstract: The assessment method of the steady state vibration and vibration fatigue life of the small bore pipe in the supporting system of the nuclear power plants is proposed according to the ASME-OM3 and EDF evaluation methods.The GGR supporting pipe system vibration is evaluated with this method.The evaluation process includes the filtration of inborn sensitivity,visual inspection,vibration tests,allowable vibration effective velocity calculation and vibration stress calculation.With the allowable vibration effective velocity calculated and the vibration velocity calculated according to the acceleration data tested,the filtrations are performed.The vibration stress at the welding coat is calculated with the spectrum method and compared with the allowable value.The response of the stress is calculated with the transient dynamic method,with which the fatigue life is evaluated with the Miners linear accumulation model.The vibration stress calculated with the spectrum method exceeds the allowable value,while the fatigue life calculated from the transient dynamic method is larger than the designed life with a big safety margin.
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Key words:
- Small bore pipe /
- Nuclear power plants /
- Vibration evaluation /
- Vibration fatigue life
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