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第3回
アモルファスMIセンサを用いた2方向センシングおよび 漏洩磁束密度分布関数のパラメータによる欠陥深さと欠陥位置の評価
著者:
安部 正高,Masataka ABE,琵琶 志朗,Shiro BIWA,松本 英治,Eiji MATSUMOTO
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There are few works using 2-dimensional measurement in Magnetic Flux Leakage testing. We attempt to estimate the flaw depth and distinguish front or back surface flaw by estimating horizontal component Bx and vertical componen t B, of the magnetic leakage flux density from magnetic structural material. We first calculate the distribution of magnetic flux density near a specimen surface by use of FEM analysis. The distribution is assumed to be approx imated by exponential function according to the dipole mo...
英字タイトル:
Evaluation of Depth and Location of Defects Based on 2-Axis Sensing with Amorphous MI Sensors and Parameter Evaluation of Leakage Flux Density Function
第3回
インテリジェント ECT の実機適用
著者:
浅田 義浩,Yoshihiro ASADA,川田 かよ子,Kayoko KAWATA,川瀬 直人,Naoto KAWASE,七田 知紀,Tomonori SHICHIDA,高次 正弥,Masaya TAKATSUGU
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The Intelligent ECT probe has been developed to achieve high speed inspectio n and high flaw detectability compared with conventional ECT probe. Intellig ent ECT probe has 24ch multi array coils which consist of inclined drive coi ls and thin-film pick-up coils and has various diameter types for inspectio n of various steam generators. In Japan, Intelligent ECT has been applied to 100% full length inspection of actual plants with fully automatic data acqu isition system. The Intelligent ECT has been applie...
英字タイトル:
Field experience with intelligent ECT
第3回
オーステナイト系ステンレス鋼の多層溶接部における ・ 溶接直後急冷による残留応力改善技術の開発
著者:
柳田 信義,Nobuyoshi YANAGIDA,小出 宏夫,Hiroo KOIDE
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To reduce tensile residual stress in a welded region, we developed a new welding method that applies a water-shower behind the welding torch. To verify the effects of the meth od, specimens welded with or without water shower cooling were manufactured. Residual stresses of the specimens were experimentally measured. It was found that tensile residua l stresses were generated on the surface of the welds and those were reduced in the case that the water-shower was applied. These measurement results agree wel...
英字タイトル:
Development of Residual Stress Improvement Technology for Multi-Layer Welded Joint of Austenitic Stainless Steel Using Rapid Cooling During Welding
第3回
ガイド波を用いた配管中の損傷画像化技術
著者:
林 高弘,Takahiro HAYASHI,村瀬 守正,Morimasa MURASE,長尾 将弘,Masahiro NAGAO
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Development of pipe inspection equipment with guided waves is described in this study. Authors have developed a defect imaging technique, in which reflected guided waves from such reflective objects as defects and weld lines are detected with many sensors lining up in the circumferential direction and the waveforms are processed with mode extractio n technique and wave reconstruction. Pipe inspection equipment developing in this study has a function of the defect imaging as well as modal analysis of guide...
英字タイトル:
Defect imaging technique with guided waves
第3回
キャビテーション・ショットレス・ピーニングによる金属材料の強度向上
著者:
祖山 均,Hitoshi SOYAMA
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Cavitation normally causes severe damage in hydraulic machinery such as pumps and valves. However, cavitation impact can be used for surface enhancement as same way as shot peening. The peening method using cavitation impacts are called “cavitation shotless peening (CSP)” as shots are not required . The great advantage of CSP is that the peened surface is smoother than shot peened one. This is one of reasons why impovement of fatigue strength of metallic materials peened by CSP is better than that of shot ...
英字タイトル:
Surface Enhancement of Metallic Materials by Means of Cavitation Shotless Peening
第3回
コスト&効果最適化を指向した保全手法
著者:
川中 勉,Tsutomu KAWANAKA,玉木 悠二,Yuji TAMAKI
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We have explained the planning method of maintenance schedule to ensure the high reliability at minimum cost. At the present, maintenance costs higher than re quired. This comes from mismatch between judgment of importance to be repaired and properties of equipment posses. Property means specification, potential loss or urgency that equipment possesses. To solve this subject, properties of equipment have to be evaluated suitably, and then maintenance management density as w ell. The important matter is est...
英字タイトル:
How to establish maximized optimized Plant Maintenance at low cost
第3回
シュラウドサポート用遠隔駆動装置の開発
著者:
安達 弘幸,Hiroyuki ADACHI,湯口 康弘,Yasuhiro YUGUCHI,島村 光明,Mitsuaki SHIMAMURA,前原 剛,Takeshi MAEHARA
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Stress Corrosion Cracking (SCC) on reactor internal components has become one of the most important issues in recent years, and demand for the inspection of reactor internals is increasing. Especially, SCC has detected in shroud support recently so inspection technology for s hroud support has to be developed as soon as possible. We have developed delivery system for shroud support in BWR plant which is availabl e for Visual Testing and Ultrasonic Testing. The specification and positioning capability of th...
英字タイトル:
Development of Delivery System for Shroud Support in BWR Plant
第3回
タービンロータ浸透探傷検査装置の開発
著者:
小野 繁利,Shigetoshi ONO,宮川 英己,Hideki MIYAGAWA,後藤 信二,Shinji GOTO
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This paper outlines the development of fluorescent penetrant testing system for turbine rotors. At TEPCO's nuclear power plants, the inspection for turbine rotors implements dye penetrant testing. the inspection for turbine rotors using dye penetrant testing often needs many workers and work hour s from our previous experience. We succeeded in the development of fluorescent penetrant testing system for turbine rotors, which can implement the inspection automatically and shortly. This paper also outlines ...
英字タイトル:
Development of Fluorescent Penetrant Testing System for Turbine Rotor
第3回
フェーズドアレイ UT の RV セーフエンドへの適用
著者:
西田 純一朗,Jun-ichiro NISHIDA,浅田 義浩,Yoshihiro ASADA,増本 光一郎,Koichiro MASUMOTO,村上 平八朗,Heihachiro MURAKAMI,川波 精一,Seiichi KAWANAMI
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In the nuclear power plant, ultrasonic testing is performed as an in-service inspection of the reactor vessel (RV-ISI) according to JSME code. MHI is using the advanced UT machine (A-UT machine) system to RV-ISI under the high radiatio n condition. RV-ISI is one of the critical path in ISI schedule, so it is strongly required to reduce the inspection t ime of RV-ISI. In this report, the counter measure to reduce RV-ISI period by using the phased array UT is described....
英字タイトル:
Application of Phased Array UT to RV Safe End Welds Inspection
第3回
ベイズ統計を用いた点検・取替周期の最適化
著者:
笠井 雅夫,Masao KASAI,草刈 良至,Yoshiyuki KUSAKARI,能登谷 淳一,Junichi NOTOYA
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Abstract This study describes the formulations to optimize the time interval of inspections and/or replacements of equipment/parts taking into account the probability density func tions (PDF) for failure rates and parameters of failure distribution functions (FDF) and evaluates the optimized results of these time intervals using our formulations by comparin g with those using only representative values of failure rates and the parameters of FDF instead of using these PDFs. The PDFs are obtained with Bayesi...
英字タイトル:
Optimization of Inspection and Replacement Period by Using Bayesian Statistics
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