38件が見つかりました。

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第8回
フェーズドアレイ UT によるニッケル基合金溶接部の欠陥深さ測定要領の検討
著者:
平澤 泰治,Taiji HIRASAWA,岡田 久雄,Hisao OKADA,福冨 広幸,Hiroyuki FUKUTOMI
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Recently, it is reported that the primary water stress corrosion cracking (PWSCC) has been occurred at the nickel based alloy weld components such as stea m generator safe end weld, reactor vessel safe end weld, and so on, in PWR. Defect detection and sizing is important in order to ensure the reliable operat ion and life extension of nuclear power plants. In the reactor vessel safe end weld, it was impossible to measure crack depth of PWSCC. The crack was dete cted in the axial direction of the safe end w...
英字タイトル:
Investigation of Phased Array UT procedure for Crack Depth Sizing on Nickel Based Alloy Weld
第8回
フラックスゲートセンサを用いた S450 円筒材の欠陥断面形状の評価
著者:
鈴木 隆之,Takayuki SUZUKI,蓮見 清章,Kiyoaki HASUMI,中住 昭吾,Shogo NAKASUMI,寺本 徳郎,Tokuro TERAMOTO
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Defect in S45C cylindrical component was evaluated by using fluxgate (FG) magnetic sensor, which could measur e the order of 10 T magnetic flux density. Changes in magnetic flux densities were measured around a defect i n a plain cylinder component. In order to analyze defect shape and size quantitatively, the relationship betwe en magnetic flux densities and magnetic dipole moment of the defect plane in cylindrical component was formul ated. And the inverse analysis of Tikhonov regularization technique wa...
英字タイトル:
Evaluation of Cross-section Shape of Defect in Cylindrical Component byUsing Fluxgate Magnetic Sensor
第8回
ポストフクシマの発電所運営をとりまく事業課題
著者:
山下 寛子,Hiroko YAMASHITA
発刊日:
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Fukushima incident impacted the nuclear generation industry worldwide. Unexpected sudd en change of the industry environment effected serious management issues simultaneousl y to nuclear operators. In the paper, , management issues in mid-long term are discuss ed with reference to efforts taken by operators and regulatory post Three Mile Island....
英字タイトル:
Management Issues for nuclear plant operators in post Fukushima
第8回
レーザ溶接部の検査技術開発
著者:
西村 昭彦,Akihiko NISHIMURA,寺田 隆哉,Takaya TERADA,山田 知典,Tomonori YAMADA,竹仲 祐介,Yusuke TAKENAKA,古山 雄大,Takehiro FURUYAMA
発刊日:
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We are developing the inspection technology for laser micro spot welding. Butt welding for the inner wall of heat exchanger tubes were successfully carried o ut by a composite-type optical fiber scope. The related technologies are the f ollowing : Rapid inspection by Eddy Current Testing Fiber endoscope observation 3 Synchrotron X-ray absorption contrast method. These technologies are versatile to be applied in maintenance for industrial production plants....
英字タイトル:
Development of Inspection Technology for Laser Welding Section
第8回
低圧ケーブル絶縁劣化診断法の信頼性検討
著者:
渡士 克己,Katsumi WATASHI
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The insulation degradation can be appeared in cables which were installed at radiation and air environment in aged LWRs. It is implicated that the behavior is related to decrease of an antioxidant among the stabilizers which was caused by thermal oxidation and radiation induced oxidation. JNES has prepared a diagnostics method of insulation degradation for safety related low voltage cable used in aged LWRs.Th is paper shows a degradation indicator, for which nondestructive test and, then, probability of in...
英字タイトル:
Reliability Aspect of Diagnostics Method of Cable Insulation for LWRs
第8回
共同溝暑熱環境最適化への取り組み(1) 蒸気配管放散熱量の改善
著者:
石山 道,Toru ISHIYAMA,川崎 一男,Ichio KAWASAKI,松本 岳也,Takenari MATSUMOTO,寺田 秀行,Hideyuki TERADA,菊池 明夫,Akio KIKUCHI,溝口 剛,Tsuyoshi MIZOGUCHI,池田 博之,Hiroyuki IKEDA
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In the undergrounding pipe-space, there are many pipes for utility (electronic cable, water, gas, steam, etc.). These pipes are kept to safe by daily inspect ion. But hot environment of the pipe-space affects badly the device and a labor er's health.The investigation of the heat distribution was carried on, therefor e it was found that the radiant heat around the valve was very much. The method of thermal insulation was examined from the view point of the shape, cost, and effect. Then some of valves were ...
英字タイトル:
The activities for improvement of hot environment in undergrounding pipe-space(trench)(1)The decrease of the radiant heat from steam pipe
第8回
内壁減肉配管補修のためのレーザー溶接技術開発
著者:
寺田 隆哉,Takaya TERADA,西村 昭彦,Akihiko NISHIMURA,岡 潔,Kiyoshi OKA
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We are developing the laser welding and cladding device for the maintenance of heat exchanger pipes. In the We are developing the laser welding and cladding device for the maintenance of heat exchan ger pipes. In the case of flow accelerated corrosion where pipe wall thinning occurred after a long time operation, laser cladding is mostly expected. A laser processing head was proposed in order t o access the pipe wall. A composite-type optical fiber scope was used for real time observation and laser process...
英字タイトル:
Development of Laser Cladding Technology for Maintenance ofPipe Wall Thinning
第8回
円管内オリフィス背後の物質輸送現象に関する研究 -シュミット数の影響-
著者:
佐藤 祐紀,Yuki SATO,山縣 貴幸,Takayuki YAMAGATA,伊藤 晃宏,Akihiro ITO,藤澤 延行,Nobuyuki FUJISAWA,高野 剛,Tsuyoshi TAKANO
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In this paper, experimental and numerical studies are carried out to understand the pipe-wall thinning caused by the flow accelerated corrosion behind an orifice in a circular pipe. The measurement of mass transfer coefficient is carrie d out using a wall material of benzoic acid in a water flow, which allows the measurement of mass transfer behind the orifice in a circular pipe at Schmidt number 300 and 700, which is comparatively close to the actual condition in the prototype pipeline of nuclear power pl...
英字タイトル:
Study on Mass Transfer Phenomenon behind an Orifice in a Circular Pipe - Effect of Schmidt Number -
第8回
市民とのリスクコミュニケーションに求められるもの ～2009年度調査からみた福島以後の専門家の課題～
著者:
土屋 智子,Tomoko TSUCHIYA
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Abstract This presentation focuses on the differences between experts and the public based on the 2009 survey and the experiences of risk communication activities in Tokai-mura since 2003. The results of the 20 09 survey show that the public perception for the risk of nuclear power generation lowered comparing with the 1999 survey. However, the accident at the Fukushima Daiich nuclear power plant might impact on both risk perception of lay people and experts, because they answered how national government o...
英字タイトル:
How and What Should Nuclear Experts Communicate the Public after theFukushima Accident?
第8回
改良 9Cr 鋼および 316FR 鋼のレーザ・ピーニング処理
著者:
中曽根 祐司,Yuji NAKASONE
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This paper describes shot peening treatment of modified 9Cr steel and 316FR austenitic stainless steel, candidate structural materials for FBR by using YAG laser. A laser peening system has been developed and used to provide laser peening treatment for plate s pecimens of the two types of the steels dipped in water. A high speed digital camera revealed that many small bubbles were initiated along the path of laser light, moved along the path and coalesced with one another to produce a few large bubbles. Th...
英字タイトル:
Laser Peening Treatment of modified 9Cr and 316FR Steels
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