102件が見つかりました。

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第2回
Development of Eddy Current Monitoring System andIts Application to Crack Propagation Monitoring
著者:
Toshiyuki TAKAGI,Takashi KASUYA,Hisashi ENDO,Tetsuya UCHIMOTO
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This paper describes the feasibility of Eddy Current Monitoring (ECM) system as an in-situ evaluation method of crack propagation in a Boiling Water Reactor (BWR) environment. For the purp ose, we explain an ECM experiment conducted at a System Safety Benchmark Facility (SSBF) with a large-scale austenitic stainless steel pipe specimen. Several slits were prepared at the Heat Affected Zones (HAZS) and weld lines from the inner surface. After exerting the load, Eddy Current Testing (ECT) probes attached on ...
英字タイトル:
Development of Eddy Current Monitoring System andIts Application to Crack Propagation Monitoring
第2回
Feasibility Study on Advancement of Maintenance Quality for Nuclear Power Plants
著者:
Hidekazu YOSHIKAWA,Eiji MATSUMOTO,Shiro BIWA, Shoji IMATANI,Toshihiko HOSHIDE,Hiroshi SHIMODA,Makoto TAKAHASHI,Takashi NAGAMATSU,Hiroyasu SHIMADA,Yoshio NAKATANI
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A feasibility study was conducted on advancement of plant maintenance technology by noticing the integration of non destructive test, fracture mechanics, distributed netw ork, and human interface technologies. In fact, the study was conducted by dividing into the two area: Area A for the methods of non destructive testing and the simulatio n methods on fracture mechanics, while area B for human interface technologies for maintenance work support. During the course of the feasibility study, the developmenta...
英字タイトル:
Feasibility Study on Advancement of Maintenance Quality for Nuclear Power Plants
第2回
Laser-Ultrasonic Non-Destructive Testing:hniques and Applications in Nuclear Industry
著者:
Makoto OCHIAI,Takahiro MIURA,Satoshi YAMAMOTO,Toru ONODERA
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A New method for non-destructive testing (NDT) of surface-breaking tight cracks based on laser-induced nce acoustic waves (SAW) is proposed. A Q-switched Nd:YAG laser is used to generate SAW through Live interaction between material and the laser pulses. The SAW is probed by an optical interferometer as a o displacement of the surface. A state-of-the-art technique in laser-ultrasonic NDT is reviewed: that is the < depth measurement by using fr equency analysis of SAW transmitted through cracks. The techni...
英字タイトル:
Laser-Ultrasonic Non-Destructive Testing:hniques and Applications in Nuclear Industry
第2回
Maintenance Strategy: Burden to Importance Approaches
著者:
Jun Su Ha, Poong Hyun SEONG
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In order to enhance maintenance effectiveness by using risk information, Burden to Importance Ratio (BIR) is used in this study. The BIR is a measure representing the extent of maintenance burden (resources or activities) imposed on a System, Structure, or Component (SSC) in comparison with the importance value of the SSC. Therefore maintenance burden imposed on the SSC having high BIR can be reduced to the extent of its importance. The evaluation of BIR were applied to 22 valves selected among 516 Motor O...
英字タイトル:
Maintenance Strategy: Burden to Importance Approaches
第2回
Ni基合金溶接部の溶接条件が超音波探傷の欠陥検出に与える影響
著者:
西川 聡,Satoru NISHIKAWA,古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,堀井 行彦,Yukihiko HORII
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In order to study the influence of welding condition on the detectability of flaws in Ni based alloy by UT, we lding conditions, such as heat input, magnetic stirring and weaving were changed. Flaws in small heat input we ld joints was difficult to be detected because of the presence of high noise. On the contrary, welded joints m ade with large heat input and weaving showed lower noise and EDM notches in these joints were easily detected....
英字タイトル:
The Influence of Welding Condition on Flaw Detectability by Ultrasonic Test in Ni Based alloy welds.
第2回
PSA 手法による経済的リスク情報の保守管理への活用
著者:
友澤 孝司,Takashi TOMOZAWA,倉本 孝弘,Takahiro KURAMOTO,豊嶋 謙介,Kensuke TOYOSHIMA
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片桐 康寛 Yasuhiro KATAGIRI Abstract: This paper discusses a PSA approach to evaluate the economic risk importance of Balance Of Plant (BOP) system equipment/component with respect to loss of power production, that is the plant trip or the plant power reduction. The economic risk importance used in this study is the Megawatt-Hour loss. Knowing this relative import ance of the BOP system equipment/components allow the plant to prioritize the maintenance of the equipment. This study was performed on a typical ...
英字タイトル:
Application of the Economical Risk Information for the Maintenance Activity Using PSA Approach
第2回
SCC 予防保全を目的とした SUS316L 鋼レーザ表面溶融処理部における高温割れ発生挙動に関する理論的検討
著者:
森 裕章,Hiroaki MORI,西本 和俊,Kazutoshi NISHIMOTO
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The solidification brittleness temperature range (BTR) and local strain in laser surface melted regions of Type 316L stainless steels were investigated in this study, to make clear the mechanism of solidification cracking in the region. The BTR in laser surface melted regions was estimated by the calculation of its upper and lower limits with using the dendrite growth model for Fe-Cr-Ni system and the thermo-dynamic analysis based on calculated phosphorus concentrations at dendrite boundaries in the melted...
英字タイトル:
Theoretical Analysis of Hot Cracking Behavior in Melted Regions of Type 316L Stainless Steels by Laser Surface Melting Treatment for Maintenance to Prevent SCC
第2回
SUS304 鋼の高温疲労損傷初期段階における磁気特性変化
著者:
高屋 茂,Shigeru TAKAYA,永江 勇二,Yuji NAGAE
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Developing a precise nondestructive estimation method of material degradation before crack initiation will contribute to enhancement of safety and economical efficiency of a fast breeder reactor plant. Magnetic property is expected to be an effective indicator. In this study, fatigue t ests on SUS304 stainless steel at 650°C were conducted until transition hardening region, 25% and 50% of the number of cycles to fracture and the distribution of magnetic flux density from each sample was measured to reveal ...
英字タイトル:
Magnetic Property Change of SUS304 Stainless Steel at Initial State of Fatigue Damage in High Temperature Environment
第2回
SUS316L 鋼の表面残留応力に及ぼす機械加工の影響
著者:
中東 重雄,Shigeo NAKAHIGASHI,山本 厚之,Atsuyukitu YAMAMOTO,山田 孝行,Takayuki YAMADA,劉 莉,Lin LIU,寺澤 倫孝,Mititaka TERASAWA,三田村 徹,Tohru MITAMURA,椿野 晴繁,Harushige TSUBAKINO,菖蒲 敬久,Takahisa SHOBU,秋庭 義明,Yoshiaki AKINIWA
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Suppressing the stress corrosion cracking by reducing carbon contents in austenitic stainless steels seems to be not effective on core shrouds used in boiling water reactor in Japan. Trans-granul ar cracking was found out in the shrouds. To clarify a mechanism of the cracking, stress measurement on specimens under stretched condition in hot water has been attempted in the present study. A n in-situ device for diffraction measurements in synchrotron radiation facility has been developed by the present autho...
英字タイトル:
Effect of Surface Grinding on Residual Stress in Low Carbon Austenitic Stainless Steel SUS316L
第2回
TFG センサを用いた漏洩磁束測定による非破壊評価の研究
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 various inspection methods using Magnetic Flux Leakage Testing. In this paper, we attem pt to apply Thin-Film Flux Gate magnetic sensor to measure weak leakage flux density induced by s urface or back surface defects like cracks or notches. And it is shown that the measured magnetic flux density near the specimen surface indicates the pattern reflecting the shape of the defects....
英字タイトル:
Non-destructive Evaluation Based on Measurement of Leaked Magnetic Flux by TFG sensor
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