128件が見つかりました。

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第14回
SUS配管溶接部における柱状晶組織からのUT信号シミュレーション
著者:
直本 保,Tamotsu JIKIMOTO,上山 芳教,Yoshinori KAMIYAMA,古川 敬,Takashi FURUKAWA
発刊日:
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In the ultrasonic testing (UT) for weld part of austenitic stainless, it is generally recognized that the UT inspection has difficulty due to dispersion, attenuation, and so on. And, in UT results even for defect-free area of austenitic weld metal, echoes originated from root, columnar structure and interface between weld metal and base metal are observed with some continual variation throughout weld line. UT simulation is a very useful technique for understanding the phenomena in the ultrasonic wave ...
英字タイトル:
Simulation of UT signal for columnar structure of weld metal of stainless steel piping
第14回
インバリアント分析技術とビックデータを活用したプラント監視装置の開発
著者:
林 司,Tsukasa HAYASHI,生田 睦男,Takeo IKUTA,藤岡 隆,Takashi FUJIOKA,山本 敬之,Takayuki YAMAMOTO,高瀬 健太郎,Kentaro TAKASE
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Our Company, aims at tracking huge plant parameters (Big Data), managed by Nuclear Power Plants. By application of this Big Data, along with NEC Corporation we developed a system to detect any equipment abnormalities accurately and as much as possible at an early stage. After the implementation of the system, checks of the actual working of the system can be conducted and performance gains enhanced drastically. ...
英字タイトル:
Development of the Plant Monitor System utilized Invariant Analysis Technology and Big Data
第14回
エロージョンによる減肉に対するオンラインモニタリングの検討
著者:
吉田 正志,Masashi YOSHIDA,熊谷 克彦,Katsuhiko KUMAGAI
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Pipe wall thickness measurements by ultrasonic (UT) sensors can be difficult as the roughness of the inner surface develops by certain corrosion mechanisms. In this study, the applicability of flexible UT sensors with single and dual element transducer were evaluated using carbon steel plates with localized sand erosion that simulates pipe walls with rough inner surface. While the thickness measurement by single transducer sensors with B-B method failed after certain amount of erosion, the newly develop...
英字タイトル:
Evaluation of online thickness monitoring system for wall thinning by erosion.
第14回
オーステナイト系ステンレス鋼の微視的残留応力の回折面依存性
著者:
鈴木 賢治,Kenji SUZUKI,菖蒲 隆久,Takahisa SHOBU
発刊日:
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The plate specimen of austenitic stainless steel was prepared, and a plastic strain of 2.8% was applied to the specimen under uniaxial tension. The residual stresses of the specimen were measured by cos2 χ method using 2 2 0, 4 0 0, 3 3 1, and 6 2 0 lattice planes. For lattice planes with a lower atomic density, the 2θ-cos2 χ diagram showed an upward warp. For lattice planes with a higher atomic density, the 2θ-cos2 χ diagram showed a downward warp. This phenomenon was caused by intergranular strains. T...
英字タイトル:
Intergranular Stresses of Austenitic Stainless Steel due to Plastic Deformation
第14回
コンクリート構造物の健全性診断に向けた非破壊検査システム開発
著者:
藤吉 宏彰,Hiroaki FUJIYOSHI,松永 嵩,Takashi MATSUNAGA,小川 良太,Ryota OGAWA,匂坂 充行,Mitsuyuki SAGISAKA,礒部 仁博,Yoshihiro ISOBE
発刊日:
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Abstract We developed a hammering sound inspecting system using AE sensor with objectivity and recordability and confirmed that it is possible to grasp the state of concrete (internal cavity and surface peeling) from the vibration analysis result obtained , And confirmed the usefulness of concrete health diagnosis using this system. ...
英字タイトル:
Development of nondestructive inspection system for soundness diagnosis of concrete structure
第14回
シビアアクシデント時のプラント挙動予測について
著者:
坂本 浩之,Hiroyuki SAKAMOTO,青木 彦太,Genta AOKI
発刊日:
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We got the prospect that the cause could predict in what we made a table by the analysis result with the MAAP code by a prediction easily at time of a series of nuclear power plant behavior such as core exposure, a core meltdown start, reactor pressure vessel damage and the nuclear reactor containment vessel damage at the time of the severe accident outbreak by loss-of-coolant accident (LOCA). The nuclear power plant behavior prediction that became a table can conjugate in the nuclear emergency training...
英字タイトル:
Nuclear power plant behavior prediction in severe accident
第14回
ショットピーニング時の残留応力緩和挙動に関する検討
著者:
木谷 悠二,Yuji KITANI,柴原 正和,Masakazu SHIBAHARA,生島 一樹,Kazuki IKUSHIMA,山田 祐介,Yusuke YAMADA,西川 聡,Satoru NISHIKAWA,古川 敬,Takashi FURUKAWA,秋田 貢一,Koichi AKITA,鈴木 裕士,Hiroshi SUZUKI,諸岡 聡,Satoshi MOROOKA
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In nuclear power plants, surface treatment including the shot peening is carried out after welding for the prevention of stress corrosion cracking. In this research, the authors developed evaluation systems of the persistence of compressive residual stresses due to shot peening based on the Idealized Explicit FEM which can conduct large-scale non-linear structure analyses in realistic computing time. The developed evaluation system was applied to the analysis of the compressive residual stress due to sho...
英字タイトル:
Study of behaver to relieve residual stress at the time of the shot peening
第14回
ジオポリマーを活用した燃料デブリ取り出し工法の提案
著者:
鈴木 俊一,Shunichi SUZUKI,岡本 孝司,Koji OKAMOTO
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1.緒言 福島第一原子力発電所廃炉の課題を克服するためには、数多くの視点から課題を捉える必要がある [1]。前報告では俯瞰的視点で捉えた、燃料デブリ取り出し、廃棄物管理、及び遠隔技術の3分野の要求機能について概念を示した[2]。本報告ではこのうち燃料デブリ取り出しに絞って、どのような工法が有効であるか議論を行う。なお、工法アイデアを創出するためのブレーンストーミングは、原子力技術専門家の他、化学プラント、再処理技術、土木・建築技術、粉塵技術などに関する学内外の専門家の意見を反映して実施した。 2.燃料デブ......
英字タイトル:
A new method of fuel debris retrieval with geopolymer for Fukushima Dai-ichi NPP
第14回
ステンレス溶接金属内張り材への非破壊検査手法の適用性
著者:
今井 富康,Tomiyasu IMAI,黒野 晃平,Kouhei KURONO,丹羽 勇太,Yuuta NIWA,Jay L. Fisher,Adam C. Cobb,Alan R. Puchot
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Due to main condenser tube damage in May, 2011, seawater flowed into the reactor and other facilities of Hamaoka NPS Unit 5. The pitting corrosion was observed in the SUS weld metal cladding layer, welded to the inner face of the RPV base metal. In terms of the availability of RPV’s required functions, RPV would be capable of continuous use based on component health assessment in December, 2015. However, development of non-destructive inspection methods to SUS weld metal cladding was needed to conduct the ...
英字タイトル:
Applicability of non-destructive inspection methods to SUS weld metal cladding
第14回
ニューラルネットワークを用いた音響診断によるポンプ異常の検出
著者:
角皆 学,Manabu TSUNOKAI,高瀬 健太郎,Kentaro TAKASE,萱田 良,Ryo KAYATA
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A method that applies the neural network to acoustic data to detect abnormalities of horizontal pumps is proposed. In the experiments, running sound of a pump with bearing damage or misalignment was acquired from various distance while another pump in the same room was running or not running as a possible noise source. By applying the neural network to the appropriately processed frequency spectrum of acquired data, abnormality can be accurately detected regardless of the distance between the sensor and ...
英字タイトル:
Detection of abnormality of pumps by acoustic diagnosis using neural network
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