Eddy current testing (ECT) with multi coil probe has been developing for enhancing surface inspection. Defect extraction method based on phase angle of lissajous waveform was effective to identify between defects and noises. This paper describes applicability of crack extraction method for magnetic material. The criteria based on feature of phase angle on magnetic material could extract defects to separate from noises like liftoff using experiment and simulation....
英字タイトル:
Crack Extraction technique for Magnetic Materials by Eddy Current Testing with Multi Coil Probe

As nuclear power plants age, the importance of maintenance increases and there is a need to apply inspection technologies suitable to importance of each item of equipment. In boiling water reactors, advanced inspection technologies are expected for internal components, i.e. shroud supports with complex-shaped Ni-based alloy welds. As an inspection technology for field inspection of the shroud supports phased array technology has been mainly developed for sizing of Stress Corrosion Crackings accessed from ...
英字タイトル:
Ultrasonic testing techniques for inspection of BWR internal components welds.

Abstract An eddy current testing (ECT) system has been developed for inspecting weld surfaces of components in the reactor pressure vessel of nuclear plants. The system can be applied to curved surfaces with an ECT array probe, it can discriminat e flaws from other signal factors by using a combination of arrayed coils signal-phase. The system is applied to a mock-up of core internal components and the signal discrimination using the signal-phase clearly separated flaw and noise signals....
英字タイトル:
Surface Inspection Technique with an Eddy Current Testing Array Probe

1 flexible multi-coil eddy current testing (ECT) probe and a method for measuring the length of flaws have meen developed for inspecting comple x structures in the reactor pressure vessel of nuclear plants. The probe can be applied to curved surfaces that are larger than a curvature rad ius of 20 mm. And we propose the nethod for measuring the flaw length by introducing a decibel drop method of the ECT output signal. From the te st results of various EDM notches using the probe and the measuring method, we...
英字タイトル:
Development of Eddy Current Technique for Components in Reactor Pressure Vessel

Visual testing with underwater camera is performed for the inspection of structures in RPV. It has the case to be difficult to identify whether the indication is the crack or the imitated shape like scratch. In this case, the judgment needs much time. In this issue, the distinction method by surface ultrasonic wave emitted on the structure have been developed. This method could perform the in-situ judgment between the crack and the imitated shape by ultrasonic imaging technique with array probe....
英字タイトル:
Inspection technique for surface cracking by ultrasonic wave to optimize in-vessel inspection