A Ultrasonic Examination Method of Primary Coolant Pipelines in PWR
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摘要: 核电站主管道是连接核岛主设备的大管径、大厚壁承压管道，主管道母材由奥氏体-铁素体不锈钢材料铸造而成，其内部晶粒粗大并具有各向异性，因此在主管道焊缝上实施超声检测难度很大。介绍了一种采用多角度双晶聚焦探头、多通道超声检测分析系统、与主管道同材质的试块及分层扫查方法以适用厚壁铸造不锈钢焊缝的超声检测方法。该方法提高了对未熔合缺陷的检出率和定位精度，与射线检测方法形成良好互补，确保了焊接质量。Abstract: The main coolant pipelines(MCL) is the large diameter and thick walled pipeline in the nuclear island of PWR. The MCL base metal is austenitic-ferrite stainless steel formed by casting, and its internal structure contains coarse columnar crystal and anisotropy. So it is rather difficult to apply ultrasonic inspection for the MCL welds. But with the application of multi-angle twin crystal focusing probes, multi channel automatic UT system, and by using test block of the same material with the pipe and layered scanning method, the inspection technology is well suited for the MCL welding. Present UT inspection is complementary with the RT for the weld and is well required to guarantee the quality of the welds.
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Keywords:
- Primary coolant pipeline /
- Automatic welding /
- Stainless steel /
- Ultrasonic examination /
- Weld joint
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