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第7回
運転中保全とリスク～ 保全計画策定手法の開発とシミュレーション結果 ～
著者:
大神 隆裕,Takahiro OGAMI
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Abstract: For planning and enforcing the On Line Maintenance (OLM) in the near future, we should take care of keep reasonable balanc e between the degree of risk increase and the task volume equalization. In this paper, the current status of studying for the OLM int roducing on Japanese utilities is described. The planning approach of OLM is examined on the assumption that planned OLM can be carr ied out. The practical methods and evaluations for the OLM are described, and the trial evaluation for this met...
英字タイトル:
A Study for the Practical Methods and Evaluations for the On-Line Maintenance
第7回
運転中保全の社会的説明性
著者:
奈良林 直,Tadashi NARABAYASHI
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It is very important to enhance safety and stable operation of nuclear power plants through maintenance technologies and human activities. Recent years, the capacity factor of Japanese plant is very low compared with the European and American plants. During a decades, the capacity factor of Japanese plants gett ing worth and worth. The old type of maintenance during annual inspection made to slowdown the development of new type maintenance, such as on line monitori ng and maintenance. Therefore we should d...
英字タイトル:
Obtain Public Trust through Safety and Stable Operation of Nuclear Power Plants by Conducting the Online Maintenance
第7回
過大荷重によるＳＣＣ、疲労、水素脆性き裂の進展阻止とき裂の無害化
著者:
安藤 柱,Kotoji ANDEO,高橋 宏治,Koji TAKAHASHI,北條 恵司,Keiji HOUJYOU,橋倉 靖明,Yasuaki HASHIKURA,水上 博嗣,Hiroshi MIZUKAMI,佐野 勇人,Hayato SANO
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This study proposes an innovative method for arresting SCC, fatigue and hydrogen assisted cracks, and making harmless the cracks by overload. By overloading, compressive residual stress is introduced ahead of the crack. The residual stress reduce K values and arrest the crack. By theory, Kiscc, Kjhe and Kth increase with increasing Kov (K value by overload) and the nominal threshold values were given the equation: “Kuscc, NKjhe and NK th=C + D Kov. Where C is Kiscc, Kihe and Kth, respectively, and D is a p...
英字タイトル:
Arrest of SCC, Fatigue and Hydrogen Assisted Cracks, and Make Harmlessthe Cracks by Overload
第7回
電動弁診断技術の高度化への取り組み
著者:
松 幸太郎,Kotaro HEGI,清水 俊一,Shunichi SHIMIZU,日隈 幸治,Koji HIGUMA,西野 浩二,Koji NISHINO,尾崎 健司,Kenji OSAKI,渡部 和美,Kazumi WATANABE,濱野 文一,Frank HAMANO
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As use of condition-based maintenance is allowed in the new regulatory inspection system employed in Japan's nuclear pow er plants in 2009, development of advanced diagnostic technologies for motor-operated valves (MOVs) is now required. This report discusses advanced technologies in valve-setup verification, valve performance evaluation, monitoring of valve/ac tuator conditions by performance diagnostic system and moreover detection of stem crack by ultrasonic diagnostic system....
英字タイトル:
Development of Advanced Diagnostic Technologies for Motor-operated Valves
第7回
電磁気的手法を用いたエネルギー機器用構造材料の劣化損傷の評価
著者:
鈴木 隆之,Takayuki SUZUKI,黒田 匠,Takumi KUROTA,笹本 明,Akira SASAMOTO,西村 良弘,Yoshihiro NISHIMURA,寺本 徳郎,Tokuo TERAMOTO
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Evaluation of defect and damage for structural materials of energy device was performed by using ectromagnetic techniques. For degradation of thermal aging magnetic characterization of weld specimens HCM12A was performed. Comparing the specimen aged at 550°C for 2000 hours with that aged at D0°C for 600 hours, it was found that the changes in magnetic flux densities was clearly observed near the eld metal and heat affected zone for the specimen aged at 550°C for 2000 hours. Then the degree of egradation fo...
英字タイトル:
Evaluation of Defect and Damage for Structural Materials of Energy Device by Using Electromagnetic Techniques
第7回
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
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This study evaluates the outer race defect size of ball bearings in the accelerated life test by analyzing the signal of electromagnetic sensor. The electromagnetic sensor consists of a permanent magnet and a pickup coil. When a conductor passes in the static magnetic field, the generated eddy current is detected as the change of the magnetic field. The autocorrelatio n method is applied for sizing defects in the early phase of the damage progress and the RMS method is developed for bigger defects. With th...
英字タイトル:
Electromagnetic Nondestructive Detection for Monitoring the Damage Progress of Ball Bearings
第7回
電磁超音波共鳴法による配管減肉の計測と評価
著者:
兼本 茂,Shigeru KANEMOTO,浦山 良一,Ryo-ichi URAYAMA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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Electromagnetic acoustic transducer (EMAT) provides non-contacting measurements and is often applied to monitoring in gh temperature environment. One of drawbacks of EMAT is its low sensitivity and S/N ratio. One way to overcome the uwback is to introduce an Electromagnetic acoustic resonance meth od (EMAR); it has a high capability of evaluating ckness or ultrasonic velocity, and it is applied to the measurement of thickness, elastic constants, damping propertiesso on. Since the principle of the method is...
英字タイトル:
Measurement and Evaluation of Pipe Wall Thinning by Electromagnetic Acoustic Resonance
第7回
電磁超音波共鳴法を用いた配管厚さ寸法計測のための信号処理法
著者:
小島 史男,Fumio KOJIMA,小坂 大吾,Daigo KOSAKA,梅谷 浩介,Kousuke UMETANI
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This paper is concerned with signal processing arising in pipe wall thinning measurements using electromagnetic acoustic transducer (EMAT). First, electromagnetic acoustic resonance method (EMAR) is applied to pipe wall thickness measurement. Secondly, a heuristic method for extracting features of resonance spectrum obtained by testing data is proposed. Finally , the validity and the feasibility of our proposed method are demonstrated through the practical test at the real plant....
英字タイトル:
Signal Processing for Pipe Wall Thickness Measurements using Electromagnetic Acoustic Resonance Method
第7回
非接触空中超音波技術を用いた配管の検査法の開発
著者:
高橋 雅和,Masakazu TAKAHASHI,星野 秀和,Hidekazu HOSHINO,小倉 幸夫,Yukio OGURA,北川 秀昭,Hideaki KITAGAWA,楠元 淳一,Junichi KUSUMOTO,金谷 章宏,Akihiro KANAYA
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We have developed the constant incident angle method to inspect pipes by using high power square burst wave in non contact air upled ultrasonic testing (NAUT). We also succeeded to scan the effective guided wave propagat ed circumferentially in pipes. This per describes the optimum frequency, incident angle, the selection of prob es and examples of detecting image pictures with the onstant incident angle focusing method using focus probe....
英字タイトル:
evelopment of Inspection Method for Pipes by Non Contact Air Coupled Ultrasonic Testing
第7回
非線形渦電流法を用いた材料劣化評価
著者:
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI
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Authors have proposed non-linear eddy current method which is a novel material characterization method foc using on the non-linearity of magnetic properties. This method can be a effective tool to evaluate materia l degradations if the micro-structure changes due to degradations link with change of magnetic properties. In this paper, some examples of its applications are reviewed together with its principle of assessment....
英字タイトル:
Nondestructive Evaluation of Material Degradation by Non-linear Eddy Current Method
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