102件が見つかりました。

並び替え
第2回
辻倉 米蔵 Yonezo TSUJIKURA
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On August 9th 2004, the secondary piping rupture accident at Mihama Unit 3 took 5 innocent lives away and injured 6 others. We would like to express our full condolences on the victim of the accident and their families. We would also like to express our full apology regarding the accident. In this paper, since th e accident was severe enough to reconsider our maintenance duty, consideration from the perspective of the “Maintenology“ were discussed to expand the lesson s learnt from the accident to the over...
英字タイトル:
The lessons learnt from the secondary piping rupture at Mihama Unit 3 from the perspective of Maintenology" and generalization of its measures"
第2回
配管減肉管理システム
著者:
小貝 真名美,Manami KOGAI,阪田 浩志,Koushi SAKATA,久恒 眞一,Masakazu HISATSUNE,折谷 尚彦,Naohiko ORITANI
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Piping wall thinning of conventional nuclear power plant has been examined or evaluated by collecting or aggregating various information in a vast number of documents controlled independ entoly. Therefore, in periodic inspection or in case of a troubule of pipng, engineers should spend a lot of time and effort on collecting and organizing information of these documents. To solve this problems, document management system that can effectively add or overwright required information on the draw ing data and di...
英字タイトル:
Piping Wall Thinning Management System
第2回
鋳造ステンレス鋼の超音波探傷技術
著者:
黒住 保夫,Yasuo KUROZUMI
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Cast stainless steel is widely used for reactor coolant piping in pressurized water reactors (PWRs). Its complex crystal structure hinders accurate ultrasonic inspection. This is because the large attenuation and scattering noise due to the coars e grain structure interfere with defect detection, and the ultrasonic wave velocity variations and beam skewing resulting from the anisotropic crystal structure make the determination of defect locations inaccurate. In this study, a large apertur e twin crystal tr...
英字タイトル:
Ultrasonic Inspection of Cast Stainless Steel
第2回
鋼橋の補修・補強に対する新たな試み
著者:
林 健治,Kenji HAYASHI
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Fatigue damages have been increasing in a large number of steel bridges in Japan. In terms of repair/retrofit to fatigue damages of steel bridges, this study proposes three innovative methods for the evaluation of fatigue strength of structural members in steel bridges and the repair/retrofit of fatigue damages in l-girder bridges and steel plate deck bridges. Firstly, the simple calculation method to evaluate fatigue strength of welded joints with defects and fatigue cracks, was proposed based on fracture...
英字タイトル:
New Attempts on Repair/Retrofit of Steel Bridges
第2回
長寿命高速炉プラント実現に向けた構造材料開発の現状
著者:
青低 紀身,Kazumi AOTO,若井 隆純,祐川 正之,伊達 新吾,Shingo DATE,井上 和彦,Kazuhiko INOUE
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The present status of structural material development for Japanese long-life sodium cooled fast breeder reactor (LLSFR) is reported. Structural material is vital for maintaining i ts integrity of such a huge complicated plant throughout the life and is expected to play an important role to contain the risk in the plant when accidents occur in LLSFR. Most of appeared risks of the plant seem to be caused by the uncertainties of the material, scattering of material properties, uncertainty of operational condi...
英字タイトル:
The Present Status of Advanced Structural Material Development for the Long-Life Fast Reactor
第2回
長時間クリープ損傷を受けるオーステナイト系ステンレス鋼の磁気変化
著者:
永江 勇二,Yuji NAGAE,高屋 茂,Shigeru TAKAYA,青砥 紀身,Kazumi AOTO
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To realize long-life fast breeder reactor (FBR) plants, it is important to develop a precise estimation method of metallurgical microstruct ure change before crack initiation. For estimating the metallurgical microstructure change related to degradation in commercial FBR plants, the change of magnetic property is focused on. Austenitic stainless steel is paramagnetic, but the magnetic flux density changes as creep damage at 773K or 823K. Finally, it is possible to detect the metallurgical microstructure c...
英字タイトル:
Magnetic change in austenitic stainless steels subjected to long term creep damage
第2回
電気化学的過渡信号に着目した皮膜破壊事象の観測手法
著者:
渡辺 豊,Yutaka WATANABE
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内一 哲哉 Tetsuya UCHIMOTO Although electrochemical transients can provide very sensitive indication about the onset of localized corrosion, including initiation of stress corrosion cracking (SCC), information on location of the initiation site is not available. In the present study, we proposed an estimation method of location and m agnitude of SCC initiation events, where electrochemical transients associated with local anodic events are measured by multiple reference electrodes and location of the initi...
英字タイトル:
Electrochemical Method for Monitoring Film Ruptures in SCC Initiation Processes
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2回
非線形電磁場解析とその鉄鋼材料の劣化評価への応用
著者:
小島 史男,Fumio KOJIMA,西山 亮,Ryo NISHIYAMA
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This paper is concerned with a computational method for evaluating a degradation level of magnetic materials. Applying current to a probe with magnetic yoke, the detecting signal can be measured by pick-up coil attached with the probe. An inspection model is described by a nonlinear Euler equation in two dimensions with the state dependent magnetic permeability. The nonlinear output l east square problem is formulated for identifying the material degradation parameter. Some numerical experiments are summar...
英字タイトル:
Nonlinear Electromagnetic Field Analysis and Its Application to Nondestructive Evaluation in Material Degradation of Steel Samples
第2回
高分子圧電フィルムを用いた探傷のモニタリング
著者:
橋村 知,Tomo HASHIMURA,松本 英治,Eiji MATSUMOTO,琵琶 志朗,Shiro BIWA
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In order to detect back surface defects in a plate, the surface strain distribution is visualized by use of piezoelectric thin film. When the plate with a back surfa ce defect is deformed, the resultant strain distribution in the front surface reflects the defect. Such surface strain distribution can be obtained from the electric potential distribution on the piezoelectric film mounted on the front surface. The purpose of this paper is to detect the defects by measuring the electric potential distribution...
英字タイトル:
Monitor of searching damage with polymer piezoelectric high-polymer film