We confirmed the defect detection performance of the eddy current testing (ECT) system in order to inspect the bottom-mounted instrumentation (BMI) nozzle in reactor pressure vessel. We developed the small size cross coil type ECT sensor that has the magnetic cores near the coils and the sensor scanning equipment based on the portable laser peening system. According to the experimental results that measured the sensitivity for the defects on the concave specimen and the relationship between the senso...
英字タイトル:
Development of Eddy Current Testing System for Bottom-Mounted Instrumentation Nozzle in Reactor Pressure Vessel

We confirmed the defect detection performance of the eddy current testing (ECT) system in order to inspect the bottom-Mounted instrumentation (BMI) nozzle in reactor pressure vessel. We developed the small size cross coil type ECT sensor that has the magnetic cores near the coils and the sensor driving unit based on the portable laser peening system. According to the experimental result that measured the relationship between the sensor inclined angle and defect detecting sensitivity on the convex surfa...
英字タイトル:
Development of Eddy Current Testing System for Bottom-Mounted Instrumentation Nozzle in Reactor Pressure Vessel

Importance of repairing structures in nuclear power plants as ountermeasures for Stress Corrosion Cracking is increasing be use many plants are aging. We have developed the underwater laser beam welding (ULBW) for the repair technique. In order to achieve faster and widespread repairing, we focused on a top-ht type laser beam and hot-wire system. The top-hat type laser eam has oblong energy distribution and contributes to expand heating area. The hot-wire system heats the welding wire befor e insertion and...
英字タイトル:
A High Efficiency Method of Repairing Metal Structure using Local Laser Heating

Abstract We clarified a defect detecting capability of eddy current testing (ECT) as a surface inspection technique for underwater laser beam welding. An underwater laser beam welding procedure includes groove caving as a preparation, laser beam welding in groove and welding surface grinding as a post treatment. Therefore groove and grinded welding surface inspections are required underwater. We curried out defect detection test s using three kinds of specimens simulated a groove, reactor vessel nozzle dis...
英字タイトル:
Applicability Evaluation of Eddy Current Testing for Underwater Laser Beam Welding