Integrity Analysis of Weld Overlay Repair Structure of Upper Ω Seal Weld of Control Rod Drive Mechanism
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摘要: 针对核电厂控制棒驱动机构(CRDM)上部Ω焊缝堆焊修复(WOR)技术,采用数值模拟方法进行了修复结构完整性评估。根据堆焊修复参数制定二维轴对称高斯热源等效输入,并采用ANSYS程序的单元生死技术模拟焊接过程,得到了结构的焊接残余应力。考虑电厂运行的全部瞬态,计算了结构的瞬态应力,并开展了疲劳分析。结合焊接残余应力分析和瞬态应力分析的结果,开展了断裂力学分析。结果表明,WOR结构的疲劳结果、应力强度因子及裂纹扩展等方面均能满足相应的规范要求。
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关键词:
- 控制棒驱动机构(CRDM) /
- Ω密封焊缝 /
- 堆焊修复(WOR) /
- 完整性分析
Abstract: Aiming at the weld overlay repair（WOR） for the upper Ω seal of the control rod drive mechanism（CRDM）, numerical simulation is applied in the integrity analysis of the overlay repaired structure. 2-D axisymmetric Gauss heat source equivalent input was built according to the welding parameter, and the weld overlay process was simulated by using ‘kill elements’ technology in ANSYS program, obtaining the welding residual stress of the structure. Transient stresses ware computed considering all transients in the plant, and then the fatigue results ware analyzed. Fracture mechanics analysis was also accomplished using the welding residual stress results and transient stresses results. The analysis results show that the fatigue result, the stress intensity factor and the fracture mechanics results meet the requirements of the standard. -
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