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第10回
ガイド波を用いたエルボウ部配管減肉検査の 信頼性評価法
著者:
小島 史男,Fumio KOJIMA,日置 純子,Junko HIOKI,西野 秀夫,Hideo NISHINO
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A guided wave testing is used in non-destructive inspections for pipe wall thinning and detects defects over a wide range of pipe. In this paper, first, hit/miss results are calculated from signal responses of the guided wave testing by using thresholds. The hit/miss results decide POD curves. We confirm the differences of the POD curves affected by the thresholds. Second, an optimal parameter tuning method which is effectively adjusted based on the condition of testing is integrated to the POD. The va...
英字タイトル:
Reliability Evaluation for Guided Wave Testing of Elbow Pipe Thinning
第10回
ガイド波を用いたエルボ管の欠陥位置推定における 誤差に関する基礎的研究
著者:
西川 良祐,Ryosuke NISHIGAWA,西野 秀郎,Hideo NISHINO
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In this paper, axial locations of defects in elbow pipes were estimated by the T(0,1) mode guided waves. 50A Schedule 40 aluminum pipes with the JIS short- and long elbows and a 100A Schedule 40 aluminum pipe with the JIS long elbow were prepared and evaluated, respectively. The T(0,1) mode guided wa ves (30, 40 and 50 kHz) were generated and detected by the piezoelectric ring-shaped sensor system. In the straight regions of the elbow pipes, estimates were good agreement with the real locations of the ...
英字タイトル:
On estimation errors of defect locations using guided wave
第10回
ガイド波を用いた直管内部分減肉の3 次元形状同定法
著者:
古澤 彰憲,Akinori FURUSAWA,小島 史男,Fumio KOJIMA
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The aim of this work presented here is to demonstrate the way to identify the shape of pipe-wall-thinning in straight pipe. First, the database is developed to obtain approximate solution of waves reflected from pipe-wall-thinning with three-dimensional guided wave simulator and proper orthogonal decomposition (POD). In particular, we show that the database can be used to efficiently approximate the solutions to the guided wave propagation problem. Second, the inverse problem procedure is introduced to...
英字タイトル:
3-Dimensional Shape Identification of Pipe-Wall-Tinning With Ultrasonic Guided Wave
第10回
ガイド波用圧電式リング形センサーで励起した 円周Lambの共鳴現象を利用した肉厚測定法
著者:
森田 圭一,Keiichi MORITA,西野 秀郎,Hideo NISHINO
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Piezoelectric ring-shaped sensor (PeRS) has been widely used for guided wave inspection of piping. The PeRS i s normally consisted of plural transducer elements located along circumference at regular interval. Due to th e structure, in addition to the axially propagating torsional mode guided waves, circumferential (C-) Lamb wa ves have also been generated as spurious waves at the same time. Especially in the resonant conditions determ ined by both the specific frequencies and locations of sensor elements,...
英字タイトル:
Wall-thickness measurement by resonant phenomena of the circumferential Lamb waves generated and detected by eight transducer-elements located evenly on circumference of pipe.
第10回
コンシストレイヤー法テンパービード溶接熱影響部の靭性予測
著者:
于 麗娜,Lina YU,Kazuyoshi SAIDA,Masahito MOCHIZUKI,Kazutoshi NISHIMOTO,Masashi KAMEYAMA,Shinro HIRANO,Takehiko SERA
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Temper bead welding (TBW) is one effective repair welding method for the large-scale nuclear power plants instead of post weld heat treatment (PWHT). Consistent Layer (CSL) technique is the theoretically most authoritative method among the five temper bead welding techniques. For TBW, toughness is the key criteria to evaluate the tempering effect. A neural network-based method for toughness prediction in heat affected zone (HAZ) of low-alloy steel has been investigated to evaluate the tempering effect...
英字タイトル:
Prediction of Toughness in HAZ produced by Temper Bead Welding of Consistent Layer Technique
第10回
システム安全評価への今後の対応
著者:
内藤 正則,Masanori NAITOH,内田 俊介,Shunsuke UCHIDA,岡田 英俊,Hidetoshi OKADA,鈴木 洋明,Hiroaki SUZUKI,越塚 誠一,Seiichi KOSIZUKA
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For application of the FAC code to system safety analysis, a 1D FAC code was developed by applying 1D mass transfer coefficients and geometry factors, which could prepare for not only the probability of serious wall thinning occurrence but also a hazard scale for pipe rupture could be analyzed. FAC risk was defined as the mathematical product of the possibility of wall thinning occurrence and its hazard scale. The local maximum thinning rate could be predicted with accuracy within a factor of 2 with th...
英字タイトル:
Future Subject for Its Application to Plant System Safety Analysis
第10回
シビアアクシデント時のＢＷＲ用原子炉水位計及び 格納容器内温度計システムの開発
著者:
伏見 篤,Atsushi FUSHIMI,金田 昌基,Masaki KANADA,村田 昭,Akira MURATA,鈴木 啓嗣,Hirotsugu SUZUKI,有田 節男,Setsuo ARITA
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The severe accident at TEPCO's Fukushima Daiichi nuclear power station (TF1 accident) in March 2011 brought the lost of the functions of many instrumentation systems. In order to enable the measurements of the important parameters such as reactor water level, temperature and so on even in a case such as the TF1 accident occurs, severe accident instrumentation systems are being developed. In this paper, new system configurations of BWR water level measurement and temperature measurement in primary conta...
英字タイトル:
Severe Accident Instrumentation Systems for BWR Water Level and Temperature in Primary Containment Vessel Measurements.
第10回
シビアアクシデント時のＰＷＲ格納容器内 水素濃度計測システムの開発
著者:
西 敏郎,Toshiro NISHI,谷川 薫,Kaoru TANIGAWA,福永 浩一,Koichi FUKUNAGA,吉次 信,Makoto YOSHITSUGU,右近 浩幸,Hiroyuki UKON,池内 武司,Takeshi IKEUCHI
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The accident at TEPCO’s Fukushima Daiichi nuclear power plant on March 23, 2011 was expanded into severe accident (reactor damage and hydrogen explosion). It led to loss of many instrumentation systems, and became difficult to grasp plant state. The instrumentation systems for the severe accident of the nuclear plant are being developed. In order to prevent the hydrogen explosion, the hydrogen concentration sensor is desired to measure the generated hydrogen in the primary containment vessel, and to de...
英字タイトル:
Development of Instrumentation Systems of Hydrogen Concentration in PWR Primary Containment Vessel in case of Severe Accident
第10回
ステンレス鋳鋼の熱時効脆化推定法の検討
著者:
野際 公宏,Kimihiro NOGIWA,鬼塚 貴志,Takashi ONITSUKA,阿部 輝宜,Teruyoshi ABE,中村 孝久,Takahisa NAKAMURA,榊原 安英,Yasuhide SAKAKIBARA
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Thermal embrittlement of cast austenitic stainless steel components from the decommissioned advanced thermal prototype reactor Fugen has been characterized. Cast stainless steel materials were obtained from recirculation pump casing. The actual time at temperature for the materials was 138,000 h at 275 oC. The “Fugen” material show modest decrease in Charpy-impact properties and a small increase in micro-Vickers hardness in ferrite phase because of thermal aging at relatively low service temperatures. ...
英字タイトル:
Research of Estimation Method of Thermal Aging Embrittlement on Cast Austenitic Stainless Steel
第10回
ステンレス鋼溶接金属を透過した超音波探傷試験
著者:
中川 純二,Junji NAKAGAWA,土屋 直柔,Naonari TSUCHIYA,菅原 良昌,Yoshimasa SUGAWARA,山田 浩二,Kouji YAMADA,西野 輝之,Teruyuki NISHINO,寺門 剛,Takeshi TERAKADO,木村 陸,Atsushi KIMURA,江原 和也,Kazuya EHARA,新川 嘉英,Yoshihide SHINKAWA,松田 誠司,Seiji MATSUDA
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It is necessary to confirm the validity of crack detection by ultrasonic testing through a stainless steel weld in order to reduce a range impossible of detection by ultrasonic testing. Therefore, we performed ultrasonic testing used to specimen with various weld joint types for providing the basic data (probability and measurement accuracy) of ultrasonic testing methods to reflect on JEAC4207.As the result, ultrasonic testing used to longitudinal wave angle beam technique(including phased array techni...
英字タイトル:
Ultrasonic testing through stainless steel welds
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