138件が見つかりました。

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第10回
熱疲労割れ破面の電気的接触度評価
著者:
遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME,王 晶,Jing WANG
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This study evaluates the distribution of electrical contact across the surface of thermal fatigue cracks by four- terminal direct current potential drop method. This study prepared seven artificial thermal fatigue cracks, artificially introduced into Inconel or type 316L stainless steel plates with a thickness of 25 mm. Columnar specimens embedded into a resin were fabricated from the plate s to measure the electrical resistance across the cracks directly. The results indicated th at thermal fatigue crac...
英字タイトル:
Evaluation of the electrical contacts of thermal fatigue cracks across their surfaces 東北大院・工学研究科
第10回
異常模擬ループ試験による多点分析手法の検討
著者:
角皆 学,Kazuyuki DEMACHI,Kentaro TAKASE,萱田 良,Stephane Perrin,ペランステファン,安達 勝,Masaru ADACHI
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Experiments that simulate bearing failures and the presence of cavitation are performed on a pump loop. During the experiments several types of data are acquired such as vibrations, system pressure, flow rate and motor current. A multivariate analysis is then applied to these data. Abnormalities are detected by evaluating the residual between the measured value and the estimated value that is determined from the model in a normal state. Because the influence of bearing failures is limited to a very loc...
英字タイトル:
Evaluation of a Multi-Sensors Condition Monitoring Method
第10回
異種金属溶接部の溶接線平行欠陥に対する UT 深さ測定法の検討
著者:
平澤 泰治,Taiji HIRASAWA,福冨 広幸,Hiroyuki FUKUTOMI,秀 耕一郎,Koichiro HIDE
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In recent years, it has been reported that the primary water stress corrosion cracking (PWSCC) has occurred in dissimilar metal weld (DMW) components such as steam generator safe end weld, reactor vessel safe end weld, and so on, in PWR. The depth sizing of such cracks with high accuracy is important in order to ensure the reliable operation and life extension of nuclear power plants. Therefore, construction of the performance demonstration (PD) system for certifying DMW inspection method is being inve...
英字タイトル:
Investigation of Phased Array UT technique for Circumferential Crack Depth Sizing in Dissimilar Metal Weld
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10回
疲労評価グランドデザインの新たな構築に向けて
著者:
中村 隆夫,Takao NAKAMURA,釜谷 昌幸,Masayuki KAMAYA
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Abstract: In this research, we investigate the issues of fatigue we have now and review Grand Design of fatigue evaluation on the basis of new role of fatigue anagement in plant long term operating scheme that is required after Fukushima daiichi NPP accident. ...
英字タイトル:
Reconstruction of Grand Design for Fatigue Evaluation
第10回
磁束漏洩法の補強板下配管減肉評価への適用性の基礎検討
著者:
菊池 弘昭,Hiroaki KIKUCHI,佐藤 界斗,Kaito SATO,清水 勇,Isamu SHIMIZU
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Basic study on applying magnetic flux leakage (MFL) method using ac excitation to a nondestructive evaluation of wall thinning occurred under reinforcing plates in nuclear power plants were performed. Frequently, MFL method by means of dc field for exciting specimens is adopted, and only intensity of magnetic flux density is evaluated. On the other hand, MFL with alternating current enable us to utilize not only amplitude of magnetic flux density but also phase difference, which contributes to evaluati...
英字タイトル:
Nondestructive evaluation of wall thinning occurred under reinforced plate by MFL method
第10回
福島原子力事故の概要と安全対策強化の取り組み
著者:
川村 慎一,Shinichi KAWAMURA
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This paper describes an overview of Fukushima accident, lessons learned from it and measures to enhance safety reflecting the lessons. The accident and response actions are analyzed to extract lessons. Based on the lessons three basic policies to enhance safety are discussed. Firstly with considerations of multiple failures defense in depth should be enhanced by applying more diverse safety measures. Secondly a phased approach should be considered in choosing mitigation measures considering timing of t...
英字タイトル:
Overview of Fukushima Accident and Measures to enhance Safety
第10回
米フォートカルホーンの洪水時の対応と再稼動への取り組み
著者:
藤井 有蔵,Yuzo FUJII,水町 渉,Wataru MIZUMACHI,奈良林 直,Tadashi NARABAYASHI
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Fort Calhoun NPP(FCNPP) experienced flood due to the elevation of water level of Missouri river from June to August, 2011. FCNPP took various responses including constructing the berm around the important facilities, and could maintain the safety of the reactor with difficulty. The response of FCNPP, which includes both good and bad aspects, will help us in examining the response to flooding at Japanese nuclear plants. In response to the occurrence of the fire of safety related breaker at FCNPP, June ...
英字タイトル:
Response for Flooding and Effort of Plant Restart at Fort Calhoun NPP
第10回
粒子法を用いた溶接施工時の 高精度温度場評価に向けた検討
著者:
越智 申久,Nobuhisa OCHI,岡野 成威,Shigetaka OKANO,望月 正人,Masahito MOCHIZUKI
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Considering the effect of the complex phenomena during the welding, for example thermal deformation, phase transformation, residual stress, etc, is important when the welding process is used. All of the effects are caused by heat input and conduction during the welding. Therefore, evaluating the heat input and conduction properties during the welding is so important in order to understand and control the phenomena. However, the weld pool has a fluid flow with thermal conduction, a free surface, and an ...
英字タイトル:
Study for Evaluation of Temperature Field during Welding using Particle Method
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