論文
ECTに基づくシュラウドの検査シミュレーション
著者:
糟谷 高志,Takashi KASUYA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,黄 皓宇,Haoyu HUANG
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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
論文
厚板用渦電流探傷プローブによる溶接部の探傷
著者:
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,佐藤 一彦,Kazuhiko SATO,黄 皓宇,Haoyu HUANG
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The authors have proposed a novel eddy current testing(ECT) probe for thick-walled plates. A basic concept of the probe is that a couple of differential pick-up coils is arranged between two exciting coils carrying currents opposite to each other. This arrangement allows strong eddy currents opposite to scan surfaces and the weak decay of eddy currents in the thickness direction. In this study, the present probe was applied to ECT of welding area. For the purpose, experiments were carried out u...
英字タイトル:
Weld Inspection Using Eddy Current Testing Probe for Thick-walled Plates
論文
原子力発電所における検査計画の 基本的立案方法に関する考察
著者:
青木 孝行,Takayuki AOKI,高木 敏行,Toshiyuki TAKAGI
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For creating an inspection plan for industrial plants like nuclear power plants, it is necessary to have a well-grounded basis. Therefore, this paper proposes a method for determining the following three elements of such a plan: the equipment to be inspected, the inspection method to be adopted, and the timing of its implementation using a scientific approach. The key idea is to analyze the components of the plan by employing the understanding of cancer detection and diagnosis in medical science and a...
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Discussion of In-service Inspection Planning for Nuclear Power Plants
論文
原子力発電所を構成する機器の簡易的な経済保全重要度 評価方法に関する研究
著者:
青木 孝行,Takayuki AOKI,児玉 典子,Noriko KODAMA,高木 敏行,Toshiyuki TAKAGI
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Safety risk importance of components in nuclear power plants has been evaluated based on the probabilistic risk assessment and used for the decisions in various plant managements. But economic risk importance of the components has not been discussed very much. Therefore, this paper discusses risk importance of the components from the viewpoint of plant economic efficiency and proposes a simplified evaluation method of the economic risk importance (or economic maintenance importance). As a result of c...
英字タイトル:
Study of a Simplified Method of Evaluating the Economic Maintenance Importance of Components in Nuclear Power Plant System
解説記事
原子力発電所用機器における渦電流探傷試験に係わる日本電気協会技術指針(JEAG4217)
著者:
高木 敏行,Toshiyuki TAKAGI,徳間 英昭,Hideaki TOKUMA,野中 善夫,Yoshio NONAKA,
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1.はじめに国内の原子力発電所は、機器ごとに適切な周期で様々な検査が行われている。この検査で、万が一、き裂が見つかった場合は、日本機械学会 発電用原子力設備規格 維持規格(以下、維持規格と略す)等に従い、健全性評価が行われている。また、必要に応じ、補修などの適切な処置が行われ、機器の健全性が確保されている。例えば、原子力発電所の主要機器の一つである原子炉圧力容器等の検査には、目視試験、表面試験、体積試験などがある。この目視試験は、主に水中カメラが利用されているが、その代わりとして超音波探傷試験または渦......
論文
固相接合を用いた 電磁非破壊検査のための模擬応力腐食割れ試験体製作技術
著者:
遊佐 訓孝,Noritaka YUSA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,橋爪 秀利,Hidetoshi HASHIZUME
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This study proposes a method to fabricate an artificial defect that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evaluations. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into the surface of the materials to be bonded so that the region is partially bonded to realize electrical resistance. Experimental demonstrations are carried out...
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Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding
解説記事
我国の原子力発電所の運転期間40年制限に関する規制上の課題と提言
著者:
高木 敏行,Toshiyuki TAKAGI,青木 孝行,Takayuki AOKI
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1. はじめに 我国の原子力発電所の運転期間 40 年制限に関する規制上の課題と提言 東北大学流体科学研究所 高木 敏行 Toshiyuki TAKAGI 東北大学大学院工学研究科 青木 孝行 Takayuki AOKI 2. プラント運転期間と寿命に関する考え方 福島第一原子力発電所事故を踏まえて平成 24 年に改正 された原子炉等規制法において、 我国で原子力発電所が 運転できる期間は 40 年間と規定された。 また、 原子力規 制委員会の認可を受ければ、 その期間を 1 回に限り 20 年 を超えな......
論文
渦電流探傷試験における光学系を用いたリフトオフ計測手法の検討
著者:
松川 淳,Jun MATSUKAWA,遠藤 久,Hisashi ENDO,阿部 利彦,Toshihiko ABE,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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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...
英字タイトル:
Methodology of Lift-off Measurement Using Optical System in Eddy Current Testing
論文
渦電流試験法を用いた高温環境におけるき裂進展の 定量的モニタリング
著者:
内一 哲哉,Tetsuya UCHIMOTO,糟谷 高志,Takashi KASUYA,高木 敏行,Toshiyuki TAKAGI,庄子 哲雄,Tetsuo SHOJI
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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
論文
電磁超音波共鳴法による配管減肉のオンラインモニタリング
著者:
浦山 良一,Ryoichi URAYAMA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,兼本 茂,Shigeru KANEMOTO
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The electromagnetic acoustic resonance (EMAR) method provides accurate and stable evaluation in high temperature environment, and it is an effective tool for online monitoring. In this study, the EMAR method and the superposition of the nth compression (SNC) for data processing are applied to online monitoring of pipe wall thinning, and the accuracy and reliability of the measurements are demonstrated through field tests using a large-scale corrosion test loop at high temperature. To measure the thic...
英字タイトル:
Online Monitoring of Pipe Wall Thinning with Electromagnetic Acoustic Resonance Method