为了对某核反应堆压力容器安全端与主管道连接窄间隙焊缝的超声波检测能力进行补充能力验证,将超声仿真技术和激光超声波可视化技术应用于安全端与主管道窄间隙焊缝的能力验证,作为技术论证的方法和手段.对检测工艺的超声声场分布覆盖范围、超声波对缺陷的响应以及超声波声束在焊缝中的动态传播规律进行试验.结果表明:超声仿真技术和激光超声可视化技术可应用于能力验证的技术论证过程,节省验证的流程和降低了验证的成本,验证了检测工艺的合理性和可应用性.

The narrow-gap welding between the reactor pressure vessel nozzle safe-end and primary pipe in the first generation II plus NPP(nuclear power plant)is different from the wide gap welding in Ling Ao Phase II NPP.For this different structure between the two NPPs,based on the results of qualification results of Ling Ao Phase II NPP,supplement qualification for narrow-gap welding inspection is required.The narrow-gap welding inspection qualification is a comprehensive qualification.That is the testing procedures include both technical justification and practical test.Visualization of laser ultrasonic detection technology and computerized ultrasonic simulation were used in qualification as one or two methods for technical Justification.Focused on the study of ultrasonic inspection technology,sound field distribution,ultrasonic responses to the defects in the weld,as well as ultrasonic beam propagation were tested and it demonstrated that the designed inspection process could meet the actual inspection requirements.Finally,through actual inspection using real narrow gap welding test block containing defects,it was validated that the designed ultrasonic technology is reasonable and applicable.