102件が見つかりました。

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第2回
結晶粒形状に注目した強度特性評価による材質制御・材料保全法の検討
著者:
原田 直樹,Naoki HARADA,勝山 仁哉,Jinya KATSUYAMA,樋口 良太,Ryota HIGUCHI,望月 正人,Masahito MOCHIZUKI,豊田 政男,Masao TOYODA
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This study proposes a numerical analysis method for evaluation of strength properties related with mater ial control and material maintenance. The method using generalized Voronoi diagram for modeling of hete rogeneity of grain shape is proposed. Effect of grain shape on strength properties is analyzed by the fi nite element method. ...
英字タイトル:
Investigation of Material Control and Material Maintenance Method by Evaluation of Strength Properties Considering Grain Shape
第2回
美浜3号機二次系配管破損事故と今後の対応
著者:
伊藤 肇,Hajime ITO
発刊日:
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キーワードタグ:
Abstract: The secondary system pipe rupture occurred on August 9,2004, at Mihama nuclear power plant unit 3. Eleven workers, who were preparing for an annual outage that was to start from August 14th, suffered burn injuries, of who five died. We sincerely and deeply apologized to the victims and their families. We will make every possible effort to ensure that such an accident will never happen again. It is estimated that the disturbed flow of water, downstream of the orifice, caused erosion / corrosion an...
英字タイトル:
Lesson learned from secondary pipe rupture at Mihama Unit 3 and our future strategy
第2回
自作した電磁超音波探触子による欠陥の画像化
著者:
大下 敬之,Takayuki OHSHITA,松本 英治,Eiji MATSUMOTO,琵琶 志朗,Shiro BIWA
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The Electro-Magnetic Acoustic Transducer (EMAT) consisting of magnets and coil can transmit and receive ultrasonic waves without contact to the specimen. So, it is expected to be used for remote testin g/monitoring of structures in severe condition. This paper discusses techniques of ultrasonic flaw detecting suitable for EMAT, e.g., waveform processing of the received signal and ultrasonic imaging t echnique. We next evaluate the characteristics of a self-produced Lorenz type EMAT such as the amplitude di...
英字タイトル:
Visualization of Defects by Self-produced Electro-Magnetic Acoustic Transducer
第2回
補修溶接時の原子炉圧力容器鋼中の He バブル形成とその制御に関する基礎研究
著者:
森下 和功,Kazunori MORISHITA
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キーワードタグ:
Possible explanation on a difference of microstructural evolution in fcc and bcc metals during temperature change after irradiation, is given based on atomistic evaluation of the binding states of helium to a matrix void, a dislocation and a grainboundary. It is here emphasized that the difference of helium bubble formation in those metals is pro duced by the fact: helium atoms are most strongly trapped by a matrix void in bcc metals, while a grainboundary is a strongest trapping site in fcc metals. These ...
英字タイトル:
Theoretical Insight into a Difference of Helium Bubble Formation in Austenitic and Ferritic Steels during Post-Irradiation Welding
第2回
複合材中のはく離欠陥の検出に対する受動型電気ポテンシャルCT法の適用
著者:
中谷 健作,Kensaku NAKATANI,久保 司郎,Shiro KUBO,阪上 隆英,Takahide SAKAGAMI
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公開日:
When a piezoelectric film is glued on the surface of a structure member subjected to mechanical load, a distribution of electric potential is induced. In the existence of defects in the member, a characteristic variation of electri c potential is observed. Based on this phenomenon, the passive electric potential CT method is developed for detection and identification of defects in a structure. In this study, the applicability of the passive electric potential CT method to the detection and identification o...
英字タイトル:
An Application of the Passive Electric Potential CT Method to Detection of Delamination in Composite Materials
第2回
詳細乱流解析手法を用いたT字配管合流部の温度揺らぎ現象評価
著者:
堺 紀夫,Norio SAKAI,池田 浩,Hiroshi IKEDA,清水 武司,Takeshi SHIMIZU,瀧川 幸夫,Yukio TAKIGAWA,大島 伸行,Nobuyuki OHSHIMA
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Abstract: Temperature fluctuations. arising when fluids with different temperature are mixed. cause high cycle thermal fatigue to materials of plant components. Thus analyzing the characterist ics of these temperature fluctuations is important for plant maintenance. In this study, a large eddy simulation, one of the detailed turbulence simulation methods. was applied to the analysi s of two typical flow patterns with temperature fluctuations in a tee pipe. Results were compared with the experimental data. ...
英字タイトル:
Evaluation of Fluid Temperature Fluctuations in a Tee Pipe by Detailed Turbulence Simulations
第2回
赤外線サーモグラフィによる欠陥モニタリング
著者:
阪上 隆英,Takahide SAKAGAMI,久保 司郎,Shiro KUBO
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Thermographic NDT techniques based on transient temperature distribution after active heating have been developed by many researchers as one of effective quantitative nondestructive testing techniques. The interest of the researchers has been focused on how to process transient temperature data after active heating i.e., pulse heating or step heating, to conduct successful identification of defect parameters such as its depth, shape and size. In this paper, a new data processing technique based on the Four...
英字タイトル:
Nondestructive Defect Monitoring Using Infrared Thermography
第2回
超音波探傷試験の検査技術者に起因する信頼性評価
著者:
東海林 一,Hajime SYOUJI,愛宕 靖司,Yasushi ATAGO,椎名 英介,Eisuke SHIINA
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In the component like the nuclear power plant to which a high reliability inspection is required, it is very important to confirm the inspecti on personnel capability because the inspection method greatly depends on their skills like UT inspection. Therefore, the qualification and cer tification for the UT personnel skills has been performed before the inspection is done. This paper shows that there is sufficient reliability in UT inspection by evaluating the UT performance data and that the Phased Array t...
英字タイトル:
Reliability Evaluation for UT Personnel Performance
第2回
軽水炉・シュラウドの表面硬化層における微細組織
著者:
末石 裕一郎,Yuichiro SUEISHI,香山 晃,Akira KHOYAMA,木下 博嗣,Hiroshi KINOSHITA,鳴井 實,Minoru NARUI,福元 謙一,Kenichi FUKUMOTO
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To verify the effect of hardened surface on stress corrosion cracking (SCC) of 316L, characteristics of cracked BWR core shroud have been investigated by means of microstructures. At the inner surface of core shroud where grinding was done, fine grains were observed at the surface thin layer. Furthermore, deformation-induced slip-line field including extensive deformation-twins was observed in the harden ed surface region. In contact with corrosion products on the shroud surface, intensive Ni enrichment a...
英字タイトル:
Microstructural Analyses of hardened surface in BWR core shroud made of 316L
第2回
軽水炉圧力容器寿命評価におけるマンガン影響
著者:
木村 晃彦,Akihiko KIMURA
発刊日:
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For extension of lifetime of light water reactors, it is essential to estimate irradiation embrittlement of reactor pressure vessel steels (RPVS) more precisely. In the cur rent estimation method, manganese is not considered to be the important element causing embrittlement. However, recently, it was observed that manganese remarkably enhanced neutron irradiation embrittlement of iron alloys at a neutron fluence higher than 3 x 102n/m? that corresponds to more than 30 years operation of reactors. In this s...
英字タイトル:
Influences of Mn on the Estimation of Lifetime of Reactor Pressure Vessel
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