国内部分蒸汽发生器在运行过程中, 其传热管胀管过渡段可能存在点蚀及应力腐蚀裂纹等缺陷。为了更有效和可靠地检测出胀管过渡区出现的缺陷, 分析了轴绕式、扁平旋转式、阵列式三种不同类型的涡流探头特性, 再通过一系列针对性试验, 对不同探头如何发现沉积物及沉积物下存在的缺陷进行了对比测试, 获得了相关的分析数据, 掌握了胀管过渡段沉积物及其缺陷的准确识别技术。

From the actual SG operation circumstances, there may exist pitting or SCC flaw in expand transition area of the heat-transfer tubes. In order to detect the flaws of expand transition area of the heat-transfer tubes effectively and reliably, the characteristics of three different types of eddy current probes as Bobbin, MRPC and Array are analyzed, and then through a series of tests, the sludge and flaw discrimination ability of different probes in expand transition area of the heat-transfer tubes are compared and tested, and related analysis accuracy data is acquired. The identification technology and its precision range of expand transition area are thus mastered.