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第5回
連成解析による気液二相流中構造物の振動・腐食評価手法の開発-4 乱流に起因する質量移行係数の評価
著者:
上原 靖,Yasushi UEHARA,内田 俊介,Shunsuke UCHIDA,内藤 正則,Masanori NAITOH,白川 典幸,Noriyuki SHIRAKAWA,王 盛,Sheng WANG
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The pipe thinning phenomenon which is due to flow accelerated corrosion (FAC) is one of the major causes of unex pected troubles at current nuclear power plants. In order to prevent these troubles in the future, it is highly important to understand and analyze FAC mechanism. So, we calculated three dimensional flow to evaluate a turbul ence energy and a mass transfer coefficient at pipe surface which is one of the key parameters of corrosion model...
英字タイトル:
Development of Evaluation Method on Flow-induced Vibration and Corrosion ofComponents in Two-phase Flow by Coupled Analysis -4The evaluation of the mass transfer coefficient induced by a turbulence flow
第5回
連成解析による気液二相流中構造物の振動・腐食評価手法の開発-5 電気化学モデルと二層酸化皮膜モデルを連成させた配管減肉速度評価
著者:
内田 俊介,Shunsuke UCHIDA,内藤 正則,Masanori NAITOH,岡田 英俊,Hidetoshi OKADA,上原 靖,Yasushi UEHARA
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Wall thinning rates due to FAC were calculated with the coupled model of static electrochemical analysis and dynamic double oxide layer analysis at the identified danger zone. Anodic and cathodic current densities an d ECPs were calculated with the static electrochemistry model and ferrous ion release rate determined by the anodic current density was used as input for the dynamic double oxide layer model. Thickness of oxide film and its characteristics determined by the dynamic double oxide layer model wer...
英字タイトル:
Development of Evaluation Method on Flow-induced Vibration and Corrosion ofComponents in Two-phase Flow by Coupled Analysis -5Evaluation of Wall Thinning Rate with the Coupled Model of Static Electrochemical Analysis and Dynamic Double Oxide Layer Analysis
第5回
連成解析による気液二相流中構造物の振動・腐食評価手法の開発-6　二相流での配管減肉評価モデル
著者:
岡田 英俊,Hidetoshi OKADA,上原 靖,Yasushi UEHARA,内藤 正則,Masanori NAITOH,内田 俊介,Shunsuke UCHIDA
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In order to evaluate the thinning rate of pip ing in feedwater drain systems in which , a n ew methodology is proposed in which the effe ct of oxidation of piping wall is considered....
英字タイトル:
Development of Evaluation Method on Flow-induced Vibration and Corrosion ofComponents in Two-phase Flow by Coupled Analysis-6Model for wall thinning rate of piping attached with two-phase flow
第5回
遠隔保守技術の大型ホットラボへの適用
著者:
坂本 直樹,Naoki SAKAMOTO,吉川 勝則,Katsunori YOSHIKAWA,櫛田 尚也,Naoya KUSHIDA,中村 保雄,Yasuo NAKAMURA,助川 清志,Kiyoshi SUKEGAWA
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Recently, the particularity of the working environment in the field of space and oceanic research lead to evelop the remote handling technology and the remote maintenance technology. Additionally, in the field f nuclear technology, such as hot laboratory, it is very important to develop the remote maintenance echnology. Espec ially, in the case of the hot laboratory to handle the irradiated fuel assembly containing he plutonium, the large scale cell equipped with shielding ability and sealing performance i...
英字タイトル:
Applying the remote maintenance technology to the Large scale hot laboratory
第5回
鉄損と赤外線映像装置を利用した鉄鋼材料の表面欠陥の可視化
著者:
山田 真也,Shinya YAMADA,松本 英治,Eiji_ MATSUMOTO,琵琶 志朗,Shiro BIWA
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This paper proposes a new flaw inspection technique by use of hysteresis heating and an infrared imaging device. If a periodical magnetic field is applied to a ferromagnetic material, it is heated by iron loss due to the m agnetic hysteresis as well as the Joule heat due to the eddy current. When the frequency of the magnetic field is not high and the magnetic permeability is large, the hysteresis heating is dominant, which enables us to uni formly heat a larger part of the specimen up to the deep region. ...
英字タイトル:
Visualization of Surface Defects of Steel Using Iron Loss And Infrared Thermography
第5回
鋼トラス橋の補修・補強、予防保全およびリダンダンシーに関する検討
著者:
林 健治,Kenji HAYASHI
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In this paper, a new retrofit and strengthening method with adjusting axial force of damaged members in steel truss bridges is proposed to prevent the failure of them and collapse of bridges. The validity of this method is verified through taking this working conditions and procedures into con sideration. And also the new measures for preventive maintenance of steel truss bridges are suggested and examined against the effectiveness. In add ition, the redundancy of total structural system is discussed taki...
英字タイトル:
A Study on Retrofit and Preventive Maintenance for Steel Truss Bridges and their Redundancy
第5回
長期間使用した9Cr系鋼構造物の電気化学計測を用いたじん性評価
著者:
西川 聡,Satoru NISHIKAWA,大北 茂,Shigeru OHKITA,山口 篤憲,Atsunori YAMAGUCHI
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The weld metal of modified 9Cr-1 Mo steels is most low toughness in its MIG weld joint. It is necessary to pay attention to the toughness of weld metal because of securing to ughness of weld joint. The weld metal of precipitated Laves phase after long-term thermal aging decreased toughness. Peak of the current density (Ip) in the electrochemical t echnique was appeared in the weld metals of precipitated a lot of large Laves phase. It seemed that appearance of lp was caused by the dissolution of the Lave...
英字タイトル:
Electrochemical technique for toughness evaluation on 9Cr type steel components by long-term used
第5回
電流制御型リモートフィールド渦電流探傷法の検討
著者:
遊佐 訓孝,Noritaka YUSA,宮 健三,Kenzo MIYA
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This study proposes a technique that would enhance the sizing ability of remote field eddy c urrent testing. Numerical simulations are conducted in an axisymmetric configuration modelin g remote field inspection of ferromagnetic steam generator tube. The simulations confirm an abrupt change of measured signal, and the change depends on the depth of a defect measured....
英字タイトル:
Remote field eddy current testing with controlled current distributions
第5回
電磁気的手法を用いたレール鋼の非破壊損傷評価
著者:
鈴木 隆之,Takayuki SUZUKI,寺崎 亮実,Akimitsu TERASAKI,寺本 徳郎,Tokuo TERAMOTO,宮崎 佳樹,Yoshiki MIYAZAKI,岩松 勝,Masaru IWAMATSU
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Using Hall and ECT sensors, a non-destructive damage evaluation was performed for the specimen of rail eel with simulated white damage layers. Two types of specimens were used, one with a simulate d white amage layer of 1mm depth and the other that of 100um. First using Hall sensor, distributio n of magnetic ux around the white damage layers was measured by means of magnetic flux leakage tec hnique. Both agnetic flux leakages of B, and B, revealed the presence of the white damage layers. Also from the ag...
英字タイトル:
Non-destructive Damage Evaluation of Rail Steel Using Electro-magnetic Techniques
第5回
電磁診断技術による異物混入ベアリングの挙動測定
著者:
萱田 良,Ryo KAYATA,黄 皓宇,Haoyu HUANG,遊佐 訓孝,Noritaka YUSA
発刊日:
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The epochal electromagnetic nondestructive detection method was proposed. In this method a permanent magnet is utilized to generate a static magnetic field and a coil with several hundred turns is used to detect the eddy currents induce d inside the ball bearings. In the present study the method is applied to observed and evaluate ball bearings contaminated extraneous substances. Experimental validations are carried out using a common ball bearing. A wound and the malf unction of bearings are well detected...
英字タイトル:
Electromagnetic Nondestructive Detection for Ball Bearings Contaminated Extraneous Substances
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