144件が見つかりました。

並び替え
第5回
著者:
千田 格,Itaru CHIDA,河野 渉,Wataru KONO,三浦 崇広,Takahiro MIURA,向井 成彦,Naruhiko MUKAI,依田 正樹,Masaki YODA
発刊日:
公開日:
キーワードタグ:
Multifunction laser welding head has been developed. The head is able to perform not only underwater laser welding as repair, but also laser peening as preventive maintenance and laser ultrasonic testing as inspection. By using the effect of color aberration with optics, laser beam was focused to the ideal spot size on each process. Laser p eening was performed on the material surface with the developed head, and stress improvement ability was confirmed....
英字タイトル:
Development of Multifunction Laser Welding Head (2) - Stress Improvement by Laser Peening Technology -
第5回
著者:
三浦 崇広,Takahiro MIURA,河野 渉,Wataru KONO,千田 格,Itaru CHIDA,吉田 昌弘,Masahiro YOSHIDA,山本 智,Satoshi YAMAMOTO,依田 正樹,Masaki YODA,落合 誠,Makoto OCHIAI
発刊日:
公開日:
キーワードタグ:
Multifunction laser welding head has been developed. The head is able to perform not only underwater laser welding as repair, but also laser peening as preventive maintenance and laser ultrasonic test ing as inspection. For inspection with multifunction laser welding head, a new method of visualized weld defects in water by laser-ultrasonics has developed. To detect and visualize a surface of weld metal with welding bead, the authors have developed a new detection method by leaky wave induced by interactio...
英字タイトル:
Development of Multifunction Laser Welding Head (3) - Surface Inspection Technique by Laser-ultrasonics -
第5回
著者:
林 健治,Kenji HAYASHI
発刊日:
公開日:
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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
著者:
樋口 裕思,Yuji HIGUCHI,重田 隆弘,Takahiro SHIGETA,石川 雅章,Masaaki ISHIKAWA,渡辺 剛史,Takeshi WATANABE,今川 隆,Takashi IMAGAWA,平井 稔雄,Toshio HIRAI,下茂 博,Takahiro SHIMO,綱崎 勝,Masan TSUNASAKI,枇杷友 啓郎,Hiroo BIWATOMO,古野 俊秋,Toshiaki FURUNO
発刊日:
公開日:
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The aim of this study is to research and evaluate new technologies i n the world from the point of view to improve the safety and securit y of pipeline for gas distribution toward the next generation which can practice the productive maintenance and preventive maintenance....
英字タイトル:
Research and Evaluation of New Technologies to Improve the Maintenance of Pipeline for GasDistribution toward the Next Generation
第5回
著者:
梅原 敏宏,Toshihiro UMEHARA,加藤 晃敏,Akitoshi KATO,谷口 彰英,Akihide TANIGUCHI
発刊日:
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Present all nuclear power plants in Fukui prefecture are located at the bay side of Japan Sea coast. New facilities may be planed to be at ocean side. The sea salt corrosion at the ocean side should be larger than it at the bay s ide. We have the salt damage experimental yard at Awara sea coast and at Fukui city (about 15km from coast) for the corrosion comparison study between Japan Sea coast and inland.We confirm the amounts of sea salt aerosol vary amo ng the season and year. The weight loss of specimen...
英字タイトル:
Determination of the Environmental Effect for the Sea Salt Aerosols Corrosion (2)
第5回
著者:
三輪 幸夫,Yukio MIWA,近藤 啓悦,Keietsu KONDO,大久保 成彰,Nariaki OKUBO,加治 芳行,Yoshiyuki KAJI
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This study proposed an evaluation method of damage occurrence of core structural materials by simulation model. Irradiation assisted stress corrosion cracking (IASCC) is one of the damage modes among aged core components. IASCC was thou ght to be caused by material degradation such as losses of workability due to radiation hardening and corrosion resistance due to radiation-induced segregation and residual stress due to welding, then the influence of residual stress on both radiation hardening and radiatio...
英字タイトル:
Study on preventive maintenance of core structural components by evaluating the influence ofresidual stress on irradiation assisted stress corrosion cracking behavior
第5回
著者:
實川 資朗,Shiro JITSUKAWA,鈴木 一彦,Kazuhiko SUZUKI,大久保 成彰,Nariaki OKUBO,芝 清之,Kiyoyuki SHIBA,高田 文樹,Fumiki TAKADA,近江 正男,Masao OHMI,中川 哲也,Tetsuya NAKAGAWA
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Results of irradiation experiment on the degradation of ductility of 8-9Cr reduced activation ferritic/martensitic steels are introduced, including those of irradiated austenitic steels. M acroscopic models of post irradiation tensile and fatigue properties obtained from the results are shown. Concept of the models should be essential for future design criteria development....
英字タイトル:
Ductility loss of materials by neutron irradiation and structural integrity of reactor core
第5回
著者:
照沼 朋広,Tomohiro TERUNUMA,大関 達也,Tatsuya OOZEKI,福有 義裕,Yoshihiro FUKUARI
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The two dissolvers installed in the Tokai Reprocessing Plant had failed occurred successively in 1982 and 1983. Then, remote-controlled equipment for repair and inspectio n has been developed because the dissolvers were installed under the high radiation condition and cannot access easily. After repair of the dissolvers, the periodic inspe ction by remoteness is periodically carried out once per year for soundness confirmation of the vessels. Moreover, the remote inspection equipment for periodic inspectio...
英字タイトル:
Development of the Remote Inspection Equipment for the Enriched Uranium Dissolvers
第5回
著者:
畑 孝也,Takaya HATA,牧野 眞臣,Maomi MAKINO,小坂 淳彦,Atsuhiko KOSAKA
発刊日:
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“Guideline for Regulatory Agencies in Evaluating Contents of Root cause Analysis by Operators“ was enacted as the policy for new inspection system in Japan. The objective is to indicate the view point to verify the appropriateness of the corrective actions and pre ventive actions implemented by operators based on root cause analysis and its analysis results. This guideline is leading to take four points into special consideration for adequate application. They are encouragement of further activities of the...
英字タイトル:
Guideline for Regulatory Agencies in Evaluating Contents of Root cause Analysis by Operators
第5回
著者:
増住 考志,Takashi MASUZUMI,月森 和之,Kazuyuki TSUKIMORI,島田 幸洋,Yukihiro SHIMADA,西村 昭彦,Akihiko NISHIMURA
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Strain sensors, which can be used for integrity monitoring of plant components and piping during the operation period continuously, are effective from the point of view of proac tive maintenance. FBG (Fiber Bragg Grating) sensor is one of the expective sensors and is used in various plants and civil engineering and construction fields except for high te mperature service. In order to apply to the component and piping of fast reactor, heat resistance is an indispensable feature of the sensor. In this study,...
英字タイトル:
Development of heat-resistant FBG sensor for high temperature structures monitoring