Abstract This paper discusses the possibility of in-situ evaluation of crack propagation using Eddy Current Monitoring (ECM) system in a Boiling Water Reactor (BWR) environment. For the purpose, an ECM experiment was conducted at the System Safety Benchma rk Facility (SSBF). The target for the monitoring was a large-scale pipe specimen made of austenitic stainless steels 304L, 316L, and carbon steel STS410, connected by weld joints of nickel based alloy 182. Slits were prepared at the Heat Affected Zones (...
英字タイトル:
In-situ Crack Evaluation using Eddy Current Monitoring in a Boiling Water Reactor Environment

This paper discusses the feasibility of shroud inspections using Eddy Current Testing (ECT). For the purpose, the three steps of simulations were carried out. At first, the propagation of postulated cracks in the H4 weld line of the shroud was estimated. Subsequently, the eddy current signals were numerically simulated based on the reduced vector potential method. At last, the inverse analyses were performed using simulated ECT signals, and crack shapes were reconstructed. The high accuracy of crack reconst...
英字タイトル:
Simulation of Shroud Inspection based on Eddy Current Testing

We verified that the eddy current testing (ECT) has the enough detectability for defects on the heat affected zone (HAZ) in welding of in-core monitor (ICM) housing inner surfaces for a special inspection involved in long-term operation. It is presumed that a detectability of ECT is decreased because a HAZ of ICM housing inner surfaces is deformed by welding. We conducted full-scale defect detection tests using the simulated ICM housing specimen with the welded part, the rotational ECT probe and the probe m...
英字タイトル:
Verification of Eddy Current Testing for In-Core Monitor Housing

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

This paper discusses the possibility of in-situ quantitative evaluation of crack propagation using Eddy Current Monitoring (ECM) system in a Boiling Water Reactor (BWR) environment. For the purpose, ECM experiment was conducted at a System Safety Benchmark Facility (SSBF). The target for the monitoring was a large-scale pipe specimen made of austenitic stainless steels 304L, 316L, and carbon steel STS410, connected by weld joints of nickel based alloy 182 within the SSBF. Slits were prepared at the H...
英字タイトル:
Quantitative Monitoring of Crack Propagation in High Temperature Environment Using Eddy Current Testing