特集記事
特集記事「発電プラントや送電設備における IoT技術とビッグデータの活用」
著者:
高木 敏行,Toshiyuki TAKAGI
発刊日:
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これまでの発電事業は、電力事業者によって長年の経験を生かして運転や保全が進められてきた。きめ細やかな配慮によってこれまで安全に運営されてきている。しかしながら、そこで得られた知識や運転は暗黙知であったという反省がある。このために技術者の高齢化に伴う技術継承の困難さがあった。 今回の特集号では、上記のような課題に対して、先進的な取り組みを紹介する。最初の記事では、火力発電所の操業により蓄積した知見と、それに加えて、最新のデジタル技術を用いて、データアナライジングセンターが中心となって保全を維持する取り組みについて紹介する。...
第10回
疲労き裂面の酸化被膜とマルテンサイト相の 渦電流試験への影響評価
著者:
浦山 良一,Ryoichi URAYAMA,封 浩,Hao FENG,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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Eddy current testing (ECT) has been widely used for the non-destructive testing of metal structures. ECT has high capability of detecting surface breaking cracks and length sizing in nuclear power plants. However, it is known there is the error in the evaluation of the depth of the crack. Martensitic phase occurs due to the stress of crack in the vicinity of the crack and oxide layer of crack surface can affect the evaluation of crack depth. In this study, we assess the influence that impact these fact...
英字タイトル:
Influence of eddy current testing of martensitic phase and oxide fillings in fatigue cracks
第10回
疲労割れの非破壊検査性能向上に必要な重要課題の抽出 Systematic Identification of Important Research Problems Necessary for Improving the
著者:
高木 敏行,Toshiyuki TAKAGI,青木 孝行,Takayuki AOKI,古村 一朗,Ichiro KOMURA,古川 敬,Takashi FURUKAWA,遊佐 訓孝,Noritaka YUSA,浦山 良一,Ryoichi URAYAMA
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The PIRT process was developed as a part of the systematic and documented means of demonstrating the validation of best estimate simulation codes in USNRC licensing of nuclear power plants. In this paper the PIRT process was applied for finding influential factors giving an impact on the accuracy of ultrasonic testing and eddy current testing and related problems required to improve the accuracy and also reports the results that the problems were ranked from the viewpoint of importance, knowledge and c...
英字タイトル:
Accuracy of Non-destructive Examination Techniques to Detect Fatigue Crack
第2回
知的革新炉実現のための計測融合仮想システム
著者:
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,早瀬 敏幸,Toshiyuki HAYASE,井小萩 利明,Toshiaki IKOHAGI,松岡 浩,Hiroshi MATSUOKA
発刊日:
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キーワードタグ:
This paper proposes a novel concept of the measurement-integrated virtual system aiming at next-gene ration uclear power plants with intelligent system. The present system is composed of wireless sensor s, a measurement-integrated simulator and a lifecycle simulator. Some element research activities to realize the measurement-integrated virtual system are introduced, and future efforts are overviewed....
英字タイトル:
Ceasurement-integrated virtual system aiming at next-generation nuclear power plants with intelligent system
第12回
補修の規格 -保全活動における是正措置(補修等)の重要性-
著者:
青木 孝行,Takayuki AOKI,高木 敏行,Toshiyuki TAKAGI
発刊日:
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For creating a corrective measure plan for industrial plant components, it is very important to have a well-grounded basis. Therefore, this paper proposes a method for determining the following three elements of such a plan: an equipment to be repaired, a corrective measure method to be adopted, and a timing of its implementation using a rational approach. And the importance of corrective measure in plant maintenance is also discussed. ...
英字タイトル:
Codes and Standards in Repair and Replacement Process .Importance of Corrective Action in Maintenance Activities
第13回
超伝導電磁超音波送信システムの構築と数値解析による超音波送信特性の定量的評価
著者:
時田 祐樹,Yuki TOKITA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,小原 良和,Yoshikazu OHARA
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In this study, superconducting electromagnetic acoustic transducer (EMAT) is developed to transmit strong ultrasound, which is expected as an experimental tool for mechanism study of nonlinear ultrasound. For the purpose, EMAT experiment is carried out using uniform and strong filed generated by a superconducting magnet, and surface displacement of specimen is measured by a laser Doppler vibrometer. As the result, the linear relationship between the surface displacement and magnetic flux density was co...
英字タイトル:
Development of superconducting electromagnetic acoustic transducer system and quantitative evaluation of ultrasound transmission by numerical analysis
第2回
電磁現象を用いた片状黒鉛鋳鉄の黒鉛形態の推定
著者:
野崎 俊彦,Toshihiko NOZAKI,佐藤 武志,Takeshi SATO,阿部 利彦,Toshihiko ABE,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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This paper discusses the feasibility of characterization of graphite morphology in gray cast irons based on electromagnetic method. For the pur pose, gray cast iron with different graphite morphology was systematically evaluated. In order to discuss electromagnetic property of gray cast iron with different graphite morphology, conductivity and permeability were measured. It was found that both conductivity and permeability mai nly depend on graphite morphology. It was shown that the graphite morphology of ...
英字タイトル:
Characterization of graphite morphology of gray cast irons using electromagnetic method
第14回
電磁超音波を用いた減肉モニタリングシステムの 福島第一原子力発電所4号機使用済燃料プール冷却配管への適用
著者:
高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO,浦山 良一,Ryoichi URAYAMA,鈴木 聡則,Akinori SUZUKI
発刊日:
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キーワードタグ:
In the decommissioning measures of Fukushima Daiichi Nuclear Power plant (1F), it is important to ensure the thermal stability of the reactor and the whole system by the cooling system in order to prevent criticality of fuel and fuel debris. However, wall thinning is concerned due to the corrosion in the piping of the cooling system. In order to maintain the safety of the system, it is necessary to manage the piping thinning. In this study, the EMAT thickness monitoring system, which can measure thickne...
英字タイトル:
Application of monitoring system using electromagnetic acoustic transducers for wall thickness measurement to Fukushima Daiichi nuclear power plant Unit 4 spent fuel pool cooling piping
第3回
電磁超音波・渦電流複合センサの開発とその有効性の検証
著者:
鈴木 研一郎,Kenichiro SUZUKI,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,佐藤 武志,Takeshi SATO,Philippe Guy,Amelie Casse
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In this study, we propose a novel EMAT-ECT multi sensor aiming at advanced structural health monitoring. For the purpose, proto-type EMAT-ECT multi-sensor was developed and their functions both as ECT and EMAT prove were evaluated. Experimental results of pulse ECT using the EMAT-ECT multi-sensor showed that the pr oposed sensor has a capability of detection and sizing of flaws. Experimental results of EMAT evaluation using the EMAT-ECT multi-sensor showed that ultrasoni c wave was transmitted by EMAT-ECT ...
英字タイトル:
Development of novel EMAT-ECT multi-sensor and verification of its feasibility
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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キーワードタグ:
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