102件が見つかりました。

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第2回
溶接時・補修時の力学特性数値シミュレーション
著者:
奥出 浩正,Hiromasa OKUDE,三上 欣希,Yoshiki MIKAMI,望月 正人,Masahito MOCHIZUKI,豊田 政男,Masao TOYODA
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キーワードタグ:
This study shows the effect of the low transformation temperature welding material on residual stress listribution and welding deformation. The expansion due to the transformation fr om austenite to martensite nduces the compressive residual stress around welds. While, in the welding structures, it is important to control the welding deformation and residual stre ss so that they may cause the strength decrease. By using he low temperature transformation welding wire, it may be possible to decrease the weld...
英字タイトル:
Numerical simulation of mechanical properities at welding and repairing
第2回
漏えい事象の評価手法に関する検討
著者:
林田 貴一,Kiichi HAYASHIDA,青木 孝行,Takayuki AOKI
発刊日:
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This study proposes a method for the evaluation of leakage from pressure retaining components. In this study, leakage from seal portion of components and leakage from flaw due to aging degradation in components are discussed. And metho ds to estimate a leak rate and its acceptance criteria in the both cases are also discussed. As a result, it was shown that it is possible to prescribe how to estimate a leak rate from seal and flaw, and how to set acceptance criteria....
英字タイトル:
Study on a method for the evaluation of leakage from pressure retaining components
第2回
漏洩磁束測定によるオーステナイト系ステンレス鋼の引張試験ひずみおよび面外曲げ疲労評価
著者:
槌田 雄二,Yuji TSUCHIDA,岡 茂八郎,Mohachiro OKA,薬師寺 輝敏,Terutoshi YAKUSHIJ,榎園 正人,Masato ENOKIZONO
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キーワードタグ:
Austenitic stainless steel is usually classified as a nonmagnetic material. However, applying stress transforms the plastic part of it into a martensitic crystal struct ure, from an austenitic crystal structure and it becomes magnetized. Strain evaluation and fatigue evaluation can be performed by measuring the leakage magnetic flux de nsity of remanent magnetization after applying strain and fatigue to austenitic stainless steels. This paper describes the measurement of leakage magnetic flux density of r...
英字タイトル:
Evaluation of Strain and Plane Bending Fatigue for Austenitic Stainless Steel by Measuring Leakage Magnet Flux
第2回
炉内構造物への予防保全技術の適用状況
著者:
磯貝 智彦,Tomohiko ISOGAI,岡村 祐一,Yuichi OKAMURA,島 晃洋,Akihiro SHIMA
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Recent years, Stress Corrosion Crackings (SCCs) are confirmed at the CRD stub tube and the RPV nozzle-welding join t in Japanese BWR plants. Several techniques to reduce the welding residual stress, which is considered to be a co mponent of SCC factor, such as a Peening are developed and applied to belt line of Core Shroud. At this article, t he overview of application results of Laser Peening (LP) and Water Jet Peening (WJP) to TEPCO's BWRs is discussed....
英字タイトル:
Application status of the preventive technology for RPV Internals in BWRs
第2回
炉内点検技術と高経年化プラントへの適用
著者:
山本 智,Satoshi YAMAMOTO,平澤 泰治,Taiji HIRASAWA,大坪 徹,Tooru OOTSUBO,落合 誠,Makoto OCHIAI,坂口 正武,Masatake SAKAGUCHI,亀山 育子,Ikuko KAMEYAMA
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The request of the inspection to reactor internals is increasing with application of the Japanese operation and maintenance code to aged nuclear power plants. Toshiba has developed many outstanding under water inspection t echnologies combined with ultrasonic testing (UT) techniques and remote operated vehicles (ROVs) technologies. Water gap phased array UT technique is capable to apply to all internals including complicated form part such a s reactor bottom head penetration weldment. Laser-ultrasonic te...
英字タイトル:
Inspection Technologies for Reactor Internals of Aged Nuclear Power Plants
第2回
状態監視保全のための光ファイバ機器監視システム
著者:
隅田 晃生,Akio SUMITA,新井 良一,Ryoichi ARAI,園田 幸夫,Yukio SONODA,瀧澤 洋二,Yoji TAKIZAWA,清水 俊一,Shunichi SHIMIZU
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We have been developing a system equipped with a mixture of hundreds of sensors for temperature, strain, and vibration. Previously, we confir med that the system could interrogate 192 points FBG sensors using a combination of time division multiplexing (TDM), waelength division mult iplexing (WDM), and an algorithm to measure the static and dynamic signal with one system. We a field test is performed and since it confirme d having formation nature as a multipoint apparatus surveillance system of 192 points...
英字タイトル:
Optic fiber of apparatus surveillance system with Condition based maintenance
第2回
異温度流体混合における熱流動特性の評価
著者:
菅原 良昌,Yoshimasa SUGAWARA,結城 和久,Kazuhisa YUKI,Hoseini Seyed MOHAMMAD,橋爪 秀利,Hidetoshi HASHIZUME,田中 正暁,Masaaki TANAKA
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In a process of hot and cold fluid mixing, temperature fluctuation in the fluid can occur. When this fluctuation is caused by unstable fluid mixing process, the surrounding structure would be damaged by high-cycle thermal fatigue. This phenomenon is observed in various nuclear power plants, which means it is important to investigate the relation between the fluid mixing process and the thermal fatigue. When there exists a 90-degree bend i n the upstream of the mixing area, the fluid mixing process becomes ...
英字タイトル:
Estimation on the thermal hydraulic characteristics in a non-isothermal fluid mixing
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
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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2回
社会基盤構造保全技術の立場から見た高精度製作法の検討
著者:
濱中 亮,Ryo HAMANAKA,和屋 裕士,Hiroshi SHIWAYA,望月 正人,Masahito MOCHIZUKI,豊田 政男,Masao TOYODA
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This paper studies the effect of initial residual stress on high-precision manufacturing for infrastructure integrity technology. Welding distortion decreases the strength of welded structure. Straightening causes secondary deformation. Althogh welding distortion should be reduced, handling welding distortion is difficult. One of the reason is the dispersion o f cutting and welding distortion. In one of the contributing factor there are an influence of initial residual stress. When the equalization of init...
英字タイトル:
Investigation of high-precision manufacturing for infrastructure integrity technology
第2回
穴およびクラックがあいても漏れない容器の開発
著者:
長屋 幸助,Kosuke NAGAYA,村上 岩範,Iwanori MURAKAMI
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This paper proposes a method for obtaining the vessel, in which there is no fluid leak when broken holes and cracks exist, because t he broken part is repaired automatically by its self-repairing mechanism. The self-repairing unit (sealant layer) is consisting of t wo rubber sheets with lattices inside. Polymer particles, which expand their volume with water, are used for having self-repairing f orces This article first discusses a method for making the vessel, then the method is applied to a tire with lar...
英字タイトル:
Vessels without Leakage when Holes and Cracks Appear
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