Research on eddy current test precision for the position of anti-vibration bars on steam generator tubes

The position offset of the anti-vibration bar on steam generation tubes is a potential safety hazard for SG operation. In this paper, eddy current test is conducted to inspect the anti-vibration bar position. Meanwhile, the factors of the test precision were also studied. The result shows that, acquisition speed and the guide tube length have less effect on the test results. The guide tube status and the curvature radius of tube have great effects on the reliability and the stability of the test result. (authors)