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第3回
Detection of EDM Defects Under Monju Support Plate Using Experimental Data from Remote Field Eddy Current Probes and a Multi-frequency Algorithm
著者:
Ovidiu MIHALACHE,Toshihiko YAMAGUCHI,Masashi UEDA,Center Takuya YAMASHITA,
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This paper describes detection of electro-discharged machine (EDM) defects in magnetic steam generator (SG ) tubes of Monju fast breeder reac tor (FBR). The EDM defects are located under support plate (SP), on the outer tube surface and they are detected by a remote field eddy curre nt probe. Using the experimental measurements and a multi frequency algorithm, the defect signal can be extracted from the SP signal. The pa rameters of the multi-frequency algorithm were calculated by comparing SP measurements...
英字タイトル:
Detection of EDM Defects Under Monju Support Plate Using Experimental Data from Remote Field Eddy Current Probes and a Multi-frequency Algorithm
第3回
Electromagnetic Property Evaluation on HAZ and Base Metal of Modified 9Cr-1Mo steel by Eddy Current Method
著者:
Haiyan TIAN,Tetsuya UCHIMOTO,Toshiyuki TAKAGI,Yukio TAKAHASHI
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Eddy-current method is applied to evaluate electromagnetic properties of modified 9Cr-1 Mo steel used in power plants in order to investigate the material changes in heat affected zone (HAZ) and base metal in Type IV damage evaluation. A pancake-coil impedance model based on eddy current theory is proposed to evaluate conductivity and permeability of conducting mat erial. Further more a series of HAZ and base specimens of Modified 9Cr-1 Mo steel in different heat treatment conditions are experimentally mea...
英字タイトル:
Electromagnetic Property Evaluation on HAZ and Base Metal of Modified 9Cr-1Mo steel by Eddy Current Method
第3回
Multi- Electrode Monitoring of Transient Anodic Events in SCC Initiation Stage: Methodology Development
著者:
Sujit BIDHAR,Yutaka WATANABE,T. UCHIMOTO
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A new technique to monitor SCC initiation event has been developed by using electrochemical potential transients which can be used to locate the position of natural occurring SCC initiation sites, in 3 dimensional space. 6 titanium wire used as reference electrode , were placed around the test piece, SUS 316, in a way to cover maximum space around the test piece in order to record the potential transients that would be coming out as a result of SCC initiation event during slow strain test carried out in Na...
英字タイトル:
Multi- Electrode Monitoring of Transient Anodic Events in SCC Initiation Stage: Methodology Development
第3回
8.16 宮城地震における女川原子力発電所1号機の設備診断調査状況について
著者:
平川 知司,Tomoshi HIRAKAWA,秋葉 真司,Shinji AKIBA,鴇田 真孝,Masataka TOKITA
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All Units of Onagawa NPS were automatically shutdown by 8.16 Miyagi Offshore Earthquake. Seismic safety analysis and evaluation were made in response to the order by Nuclear and Industrial Safety Agency and the neighboring local government's demands after that event. As a result, it was confirmed that seismic s afety of each unit was kept to the seismic shakings of this 8.16 Miyagi Offshore Earthquake and Assumed Miyagi Offshore Earthquake, as well as seismic shaki ng for safety confirmation. In addition t...
英字タイトル:
Investigation of Equipment at Onagawa Unit1 after 8.16 Miyagi Offshore Earthquake
第3回
AE による貯蔵タンクの状態監視AE でできること,出来ないこと一
著者:
竹本 幹男,Mikio TAKEMOTO,長 秀雄,Hideo CHO
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This study discusses what we can do for the condition monitoring of storage tanks by acoustic emission (AE) technique. We first introduce our attitude to the tank inspection by AE by and then the advanced method for source location of signal AEs detected by the AE sensors mounted on the terrace of annular plates. Emphasis is laid on the accurate locati on of integrity loss in the tank floor plates. At the last portion of this paper, we discuss drawbacks of conventional parallel-type AE monitoring system a...
英字タイトル:
Condition Monitoring of Storage Tank by AE- What can AE technology do?
第3回
BMI 管台 J溶接部における検査技術の開発
著者:
木村 是,Tadashi KIMURA,東 正剛,Masayoshi HIGASHI,川浪 精一,Seiichi KAWANAMI,七田 知紀,Tomonori SHICHIDA,浅田 義浩,Yoshihiro ASADA
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Recently, operation life of nuclear power plants is being extended, therefore, the maintaining the reactor vessel integrity is one of the most important matters in Japan. In these years, some leakages from penetration of alloy 600 CRDM and BMI were reported. B MI penetration is becoming one of the most critical issues in PWR components.In this paper, we introduce four new inspection techn iques including Visual testing (VT), Eddy current Testing (ECT), Adaptive Focusing UT (AdF-UT) and SAFT-UT for the BMI ...
英字タイトル:
Development of Inspecting Techniques for BMI J-Welds of PWR Nuclear Power Plants
第3回
Condition Based Monitoring using Nonparametric Similarity Based Modeling
著者:
Stephan WEGERICH
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Nonparametric modeling techniques are utilized extensively in applications involving the analysis of complex data sets. Nonparametric approaches have the desirable characteristic that they do not require a priori knowledge of the analytical form of the model meant to charac terize a dataset. Instead, they rely exclusively on the available data to establish relationships present in the data. In the context of plantwide condition based monitoring, nonparametric modeling is an extremely powerful approach. Mos...
英字タイトル:
Condition Based Monitoring using Nonparametric Similarity Based Modeling
第3回
ECT による配管減肉率の評価
著者:
黄 皓宇,Haoyu HUANG,遊佐 訓孝,Noritaka YUSA
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宮 健三 Kenzo MIYA This study proposes an investment for the evaluation of tube wastage by eddy current testing. EC T signals of differential and absolute type bobbin probes are presented by numerical simulation method. The relationships between percentage of wastage and ECT signals (amplitude and phase) ar e shown. Noise from ECT is considered and the percentage of wastage is estimated from safe side....
英字タイトル:
Evaluation of Tube Wastage by Eddy Current Testing
第3回
ECT センサロボットによる欠陥形状検査システムの開発
著者:
小林 太,Futoshi KOBAYASHI,小島 史男,Fumio KOJIMA,中塚 恆,Hisashi NAKATSUKA
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This paper deals with a recovery method of a crack shape for preventive maintenance of power plant. In order to detect a crack and recover of its shap e automatically, we develop a mobile robot with ECT (Eddy Current Testing) sensor composed of a transmitter-receiver coil probe. ECT is a major techn ique for detection of surface and subsurface cracks found out in structures of the power plant. The robot detects a crack by ECT sensor signals, local izes the crack and recover its shape by rough and fine insp...
英字タイトル:
Development of Crack Shape Inspection System with ECT Sensor Robot
第3回
Evaluation of Crack Location in Straight Pipe by Using Microwave
著者:
Abbasi KAVOOS,Ito SATOSHI,Hashizume HIDETOSHI
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Abstract. A NDT method using electromagnetic waves has strong possibility for crack dete ction in large structure such as large pipes. In this study, electromagnetic wave with a TM0,-mode is used for detecting a circumferential crack and also time of flight (TOF) of the electromagnetic wave in several pipes is evaluated to determine the crack location....
英字タイトル:
Evaluation of Crack Location in Straight Pipe by Using Microwave
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