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第12回
A Two-Dimensional EMAT Code for Non-Magnetic Materials using a Coupled/Uncoupled Formulation
著者:
Ovidiu MIHALACHE,Daniel GARCIA RODRIGUEZ,Toshihiro YAMAMOTO,Weiying CHENG
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A previously introduced two-dimensional EMAT (Electro-Magnetic Acoustic Transducer) simulation code developed in-house at JAEA, based on both coupling/uncoupling of eddy currents and wave displacement in a non-magnetic material is analyzed against 3D numerical simulations and experimental wave displacements performed by JAPEIC. The experimental setup visualizes wave propagations along the vertical surface of a stainless steel plate using a piezoelectric sensor, while the 3D simulations were performed u...
英字タイトル:
A Two-Dimensional EMAT Code for Non-Magnetic Materials using a Coupled/Uncoupled Formulation
第12回
Reliability Assessment for Electromagnetic Acoustic Resonance (EMAR) and Pulse-EMAR Methods by Statistical
著者:
Shuxiao XIE ,Ryoichi URAYAMA,Tetsuya UCHIMOTO,Toshiyuki TAKAGI
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Abstract: This study proposes a reliability assessment method for two pipe wall thickness inspection techniques, the electromagnetic acoustic resonance (EMAR) and pulse-EMAR methods, using statistical analysis. The statistical analysis uses an EMAR technique with a signal processing method called the superposition of nth compression (SNC) method, which is used to calculate the normalized SNC peak value, and is concerned with the difference between the thicknesses obtained by the EMAR method and the rea...
英字タイトル:
Reliability Assessment for Electromagnetic Acoustic Resonance (EMAR) and Pulse-EMAR Methods by Statistical
第12回
3 次元複雑曲面形状向け 超音波伝播シミュレーション技術の開発
著者:
大島 佑己,Yuki OHSHIMA,三木 将裕,Masahiro MIKI,小室 秀孝,Hidetaka KOMURO,江原 和也,Kazuya EHARA
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In the ultrasonic testing for periodic inspection of nuclear power plants, it is necessary to decide the inspection condition and probe scanning range before the inspection. Especially, ultrasonic propagation analysis was difficult for complex curved component such as nozzle parts. Therefore, we have developed an ultrasonic propagation simulation technique for three-dimensional complex curved objects based on the definition of curved surface functions and virtual scanner. We can examine appropriate ins...
英字タイトル:
Development of Ultrasonic Propagation Simulation Technique for Three-Dimensional Complex Curved Surface Shape
第12回
316 ステンレス鋼の低サイクル疲労き裂成長における環境効果
著者:
藤川 亮祐,Ryosuke FUJIKAWA,北田 孝典,Takanori KITADA,中村 隆夫,Takao NAKAMURA,釜谷 昌幸,Masayuki KAMAYA
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The purpose of this study is to investigate environmental effects on low cycle fatigue crack growth of SUS316. Low cycle fatigue test and periodical observation on inner surface of a hollow specimen was conducted by developing new type of replica observation. The crack growth in PWR environment was measured and the investigation of environmental effects on crack growth was conducted. Crack initiation rate of fatigue test in PWR environment is faster than in air condition. Crack initiation is estimated ...
英字タイトル:
Environmental Effect on Low Cycle Fatigue Crack Growth of SUS316
第12回
4 足歩行ロボットによる荷物運搬技術の開発
著者:
福島 武人,Takehito FUKUSHIMA,松崎 謙司,Kenji MATSUZAKI,谷 祐輔,Yusuke MITSUYA,中村 紀仁,Norihito NAKAMURA
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The Fukushima Daiichi Nuclear Power Station was damaged by the Great East Japan Earthquake on March 11, 2011. Since it has been difficult for workers to approach the reactor buildings due to high radiation environment, remote operated robots are required on behalf of workers. For this reason, we have developed a quadruped walking robot which can walk on uneven terrain and carry loads such as various tools. When the arm for handling loads is mounted on the robot, the conveyable load is decreased by weig...
英字タイトル:
Development of Load Carriage and Unloading Functions for Quadruped Walking Robots
第12回
AE センサを用いたメカニカルアンカの非破壊検査技術の開発
著者:
匂坂 充行,Mitsuyuki SAGISAKA,松永 嵩,Takashi MATSUNAGA,小川 良太,Ryota OGAWA,鵜飼 康史,Yasufumi UKAI,礒部 仁博,Yoshihiro ISOBE
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A new non-destructive inspection technique with using acoustic emission (AE) sensor was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with no dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The investigation of applying the new method to mechanical anchor bolts is reported. From experimental results by using this technique, ...
英字タイトル:
Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor
第12回
AE センサを用いた鋼棒、鋼管の健全性評価技術の開発 (1) 実験的検討
著者:
松永 嵩,Takashi MATSUNAGA,小川 良太,Ryota Ogawa,匂坂 充行,Mitsuyuki SAGISAKA,鵜飼 康史,Yasufumi UKAI,礒部 仁博,Yoshihiro ISOBE“,
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１．緒言 原子力発電所では、多数の基礎ボルトや配管が用いられている。これらの基礎ボルトや配管などの鋼棒、鋼管は、周辺環境（設置場所や内部流体、機械振動など）により経年劣化（腐食、摩耗、き裂など）が発生する可能性が潜在している1-2。従って、機器・構造物の安全性・信頼性を確保する観点より、鋼棒、鋼管の経年劣化を検出する非破壊検査技術が望まれている。 このような鋼棒、鋼管の健全性を検査する手法として、一般的には、目視検査や打音検査、超音波検査が採用されている3-7。しかしながら、目視検査では、たとえば基礎ボル......
英字タイトル:
Development of a new inspection system for steel rod and pipe using AE sensor (1) Experimental approach
第12回
AE センサを用いた鋼棒、鋼管の健全性評価技術の開発 (2) 理論的検討
著者:
小川 良太,Ryota OGAWA,松永 嵩,Takashi MATSUNAGA,匂坂 充行,Mitsuyuki SAGISAKA,鵜飼 康史,Yasufumi UKAI,礒部 仁博,Yoshihiro ISOBE
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キーワードタグ:
A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. The Eigen frequency and modal frequency response analysis were conducted based on FEM (finite element method). Several peaks due to natural vibrations were observed in the frequency distribution calculated in this study, and comparisons with experi...
英字タイトル:
Development of a new inspection system for steel rod and pipe using AE sensor (2) Theoretical approach
第12回
AREVA Computer Codes for Radiological Consequence Analysis
著者:
Silke Torchiani,Oliver Buss, Stephane Haussler, Oliver Ludwik, Axel Hoefer, Christoph Stiepani
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To assess radiological consequences, first an evaluation of the source term (i.e. activity release into the environment) has to be performed. This is followed by atmospheric dispersion calculations and dose assessment for the population. There are different purposes for a radiological consequence analysis, among which is the design and licensing of a nuclear installation as well as emergency preparedness and emergency response. For the different purposes, dedicated software tools are needed, which have...
英字タイトル:
AREVA Computer Codes for Radiological Consequence Analysis
第12回
Failure modes investigation of pipe structure under excessive seismic loading
著者:
Md Abdullah Al BARI,Toshiaki KOKUFUDA ,Yamato KATSURA, Takuya SATO,Kazuyuki DEMACHI ,Naoto KASAHARA
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Abstract: Preparation for DEC (design extension condition) is one of the lesson learned from Fukushima nuclear accident. From the structural point of view, it is needed to know the failure modes of the pipe structure to make adequate preparation against excessive seismic loading. But the failure modes under seismic loading are still not clear. Low cycle fatigue is one of the major failure modes observed at seismic experiments. Ratcheting is also observed at some other experiments. And collapse is assum...
英字タイトル:
Failure modes investigation of pipe structure under excessive seismic loading
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