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論文
光ファイバ型 AE センサによる状態監視/スクリーニング法の研究
著者:
町島 祐一,Yuichi MACHIJIMA,村山 英晶,Hideaki MURAYAMA
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キーワードタグ:
FOD (Fiber Optical Doppler) sensor, that can measure elastic wave in wide-band frequency, has been developed, which utilizes Laser Doppler effect within an optical fiber. In particular, FOD sensor can detect Acoustic Emission (AE), which is a useful parameter to monitor in-situ damage at various industrial equipments. AE is caused mainly by very initial micro-crack within a structural material due to over-stress, material-aging, etc. When taking advantage of fiber-optics, that are long signal transmi...
英字タイトル:
Condition Monitoring and Damage Screening by Fiber-optic AE Sensor
論文
原子力発電所における新保全技術としてのテンパービード工法の開発・適用
著者:
平野 伸朗,Shinro HIRANO,瀬良 健彦,Takehiko SERA,千種 直樹,Naoki CHIGUSA,沖村 浩司,Koji OKIMURA,西本 和俊,Kazutoshi NISHIMOTO
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Japanese government has recently addressed a policy to increase capacity factor of existing nuclear PPs to achieve the goal to decrease the emission of CO2. Numerous preventive measures have taken in nuclear power plants to minimize the risk of unexpected long shutdown. Newly developed mitigation measures or repair methods need to be qualified to satisfy regulatory standards, before it is implemented to nuclear power plants. The qualification process needs to comply regulatory standards though it may consum...
英字タイトル:
R/D and implement of temper bead welding as newly developed maintenance technique in nuclear power plant
論文
減肉配管の平面状/非平面状欠陥に適用可能な破裂内圧式の提案
著者:
辻 将隆,Masataka TSUJI,飯井 俊行,Toshiyuki MESHII
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In this paper, an internal burst pressure equation applicable to all types of planar and non-planar flaw in wall thinned straight pipes was proposed. An idea to rationally classify planar/non-planar flaw in wall thinned pipes was proposed, based on the experimental observation focused on the fracture mode. The results point out the importance to distinguish axially and circumferentially long flaws in wall thinned pipes....
英字タイトル:
Proposal of an Internal Burst Pressure Equation Applicable to Planar/Non-Planar Flaw in Wall Thinned Pipes
論文
磁気センサの分解能を考慮した逆解析に基づく欠陥形状の評価
著者:
中住 昭吾,Shogo NAKASUMI,鈴木 隆之,Takayuki SUZUKI
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In this paper, an improvement technique for non-destructive evaluation using magnetic flux leakage is presented. It is indicated that the magnetic flux density varies steeply around defects. The response function which associates magnetic dipole and magnetic flux density in terms of geometrical coordinate is improved in order to catch the average value of magnetic flux along sensor length instead of locally-restricted value. The effect of that improvement is verified in the scheme of numerical simulat...
英字タイトル:
Evaluation of Defect Shape Based on Inverse Analysis Considering the Resolution of Magnetic Sensor
論文
福島第一原子力発電所6号機における液滴衝撃エロージョンによるタービン抽気配管損傷とその対応について
著者:
稲垣 武之,Takeyuki INAGAKI,小林 照明,Teruaki KOBAYASHI,島田 森,Shigeru SHIMADA,井上 龍介,Ryousuke INOUE,薄葉 智,Satoshi USUBA,木村 剛生,Takeo KIMURA
発刊日:
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Through wall degradation was found on the extraction steam drain piping of Unit 6 of Fukushima Dai-ichi Nuclear Power Plant owned by Tokyo Electric Power Company after replacement of the turbine rotors with those of higher thermal efficiency. The mechanism of this degradation was loss of material due to liquid drop impingement. Since the estimated life time of the piping based on wall thickness measurements before the replacement was at least 9 years, the rapid wall thinning occurred after the replac...
英字タイトル:
Through wall degradation problem of the turbine extraction steam drain piping due to liquid drop impingement and measures taken for this problem at Fukushima Dai-ichi Nuclear Power Plant Unit 6
論文
蒸気発生器 3/4 インチ伝熱管用 インテリジェント ECT システムの開発
著者:
川田 かよ子,Kayoko KAWATA,山本 裕子,Yuko YAMAMOTO,黒川 政秋,Masaaki KUROKAWA,高次 正弥,Masaya TAKATSUGU,宇奈手 一之,Kazuyuki UNATE
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Intelligent ECT system for 7/8 inch tubes has been qualified as official method for inspection of Steam Generator tubes in Japan since 2003. We have developed Intelligent ECT system for 3/4 inch outer diameter tubes, which is applicable for full length inspection of all tubes in Steam Generator. We have carried out the verification test on passage, scanning speed, detectability of various defects, performance of auto screening, effectiveness of filtering, and accuracy of depth sizing of wears. Totally...
英字タイトル:
Development of Intelligent ECT System for 3/4 inch SG Tubes
論文
軽水型原子炉におけるプロアクティブ材料経年劣化研究課題
著者:
庄子 哲雄,Tetsuo SHOJI,竹田 陽一,Yoichi TAKEDA,国谷 治郎,Jiro KUNIYA,ピーター・フォード,Peter FORD,ピーター・スコット,Peter SCOTT
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The predictive and preventive maintenance technologies are of increasingly importance for the long term operation (LTO) of Light Water Reactor (LWR) plants. In order for the realization of LTO, it is essential to prevent the degradation phenomena from emergence using proper maintenance programs on foreseeing the phenomena and evaluating their rates of development. In this paper, the research subjects which should be required for the aging degradation phenomenon in LWR structural materials which were ...
英字タイトル:
Proactive Material Degradation Research Subjects for LWR
論文
配管厚さ測定への電磁超音波探触子の適用
著者:
小坂 大吾,Daigo KOSAKA,小島 史男,Fumio KOJIMA,梅谷 浩介,Kousuke UMETANI
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This paper is concerned with quantitative evaluation of pipe wall thickness using Electro-Magnetic Acoustic Transducer. Various test specimens are fabricated to simulate Flow-Accelerated Corrosion (FAC). First, measurements by Electro-Magnetic Resonance (EMAR) technique are examined. It is found that the resolution of thickness measurements is superior to the Pulse-Echo method. On the other hand, the measurement by EMAR is time-consuming because it requires long range of sweeping frequencies. Secondl...
英字タイトル:
Measurement of Pipe Wall Thickness using Electro Magnetic Acoustic Transducer
論文
電磁診断技術による転がり軸受の劣化進展過程の計測及び診断
著者:
馬渡 慎吾,Shingo MAWATARI,角皆 学,Manabu TSUNOKAI,髙瀬 健太郎,Kentaro TAKASE,萱田 良,Ryo KAYATA,宮 健三,Kenzo Miya
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This study evaluates the size of outer race defects of ball bearings during accelerated life testing by analyzing the signal of an electromagnetic sensor. The electromagnetic sensor consists of a pickup coil wrapped around a permanent magnet. When a conductor passes in the static magnetic field, the generated eddy currents are detected as a change of the magnetic field. The autocorrelation method is applied for sizing defects in the early phase of the damage growth and the RMS method is applied for la...
英字タイトル:
Nondestructive Electromagnetic Monitoring and Diagnosis of Damage Growth in Ball Bearings
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