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 (...
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In-situ Crack Evaluation using Eddy Current Monitoring in a Boiling Water Reactor Environment

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....
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Crack Extraction technique for Magnetic Materials by Eddy Current Testing with Multi Coil Probe

The wavelet transform multi-resolution analysis for articles has revealed the lines of thought. The articles have carried in papers concerning a local referendum about the construction of a nuclear power station in a residential area, a seaside, a farm and a town. Employing this new method has clarified the line of thought in these four areas has been clarified. In the seaside three strong support opinions appeared in the first, middle and last part of the press, with a small number of adverse opinions at ...
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Examinations of Objective Approaches on the Social Consensus Formation Methodology in Public Facility Construction

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....
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Surface Inspection Technique with an Eddy Current Testing Array Probe

A method of eddy current testing (ECT) data mapping for surface breaking evaluation is studied. The multicoil ECT probe utilized in this paper consists of Trans mit-Receive (TR) type sensors as array elements to obtain the information on crack directions. Switching two directional scans, U- and T- modes, gives two-dimen sional vector mapping as ECT images. The ECT signals of the TR type sensor also give the information on crack directions from their variation displayed on the c omplex number plane. Extract...
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Surface Flaw Evaluation by Vectorized Eddy Current Testing Image

This paper proposes a methodology of lift-off measurement using optical system embedded in Eddy Current Testing (ECT) system. Firstly, the influence of lift-off on ECT signal was evaluated. Secondly, both ECT signal with lift-off shifting and the lift-off signal were acquired by means of an ECT probe with an optical displacement sensor. Then two cases of the crack shapes reconstructions were carried out using inverse analysis code. One was computed with taking the measured lift-off into account and t...
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Methodology of Lift-off Measurement Using Optical System in Eddy Current Testing

If the wireless communication is feasible in the concrete structure of power plants, it is effective for us to reduce the construction cost, improve the placement of equipment and change facilities easily. In buildings of such a power plant, the reinforced concrete (RC) walls might be more than one meter in thickness, with high rebar density. Therefore, radio wave transmission over this kind of concrete walls was studied to discuss feasibility. Aperture parts of walls, such as doors, whose thickness is ...
英字タイトル:
A feasibility study of the transmission radio wave over the reinforced concrete structure in the buildings of power plants for wireless network