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第6回
耐震尤度設計におけるマクロ・マイクロ塑性理論
著者:
佐々木 克彦,Katsuhiko SASAKI,眞山 剛,Tsuyoshi MAYAMA
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Plastic theories have been used for evaluation of reliability of power plants including nuclear power plants over a period of time. Recently, new methods of evaluat ion for earthquake resistant of power plants is required because of the delay resume of the plants at Kasiwazaki-kariwa. This paper reports a method to make a new r ule to resume the plants subjected to earthquake with employing macro and micro plastic models for a structural analysis. Piping systems of a nuclear power plants a re targeted to b...
英字タイトル:
Macro and Micro Plastic Model for Earthquake Resistant Design
第6回
自家発設備における再生補修技術の実際
著者:
富田 英二,Eiji TOMITA,苅安 美恵男,Mieo KARIYASU
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In the electric power plant etc, the equipment maintenance starts being changed from the conventional time- based maintenance to the condition-based maintenance. We have a lot of experiences concerning the condition monitoring and repair technology in on-site power plants. In this report, we introduce the idea of the rep air technology in the condition-based maintenance, and we describe original reproduction repair technology....
英字タイトル:
Reproduction Repair Technology in Equipment of On-site Power Plant
第6回
自己修復型センサネットワークの研究
著者:
藤原 健,Takeshi FUJIWARA,高橋 浩之,Hiroyuki TAKAHASHI
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This study proposes an innovative method for the monitoring the nuclear power plant. In this field, false detection of the trouble, both “false negative” and “false positive” will become a serious problem. In the other hand, since its c omplexity of nuclear power plant, simplicity of monitoring system is strongly required. Here, we propose new method of signal processing and data transmission to realize reliable monitoring system consisted of multiple nodes of sensors....
英字タイトル:
Sensor Network for Nuclear Power Plant
第6回
表面処理方法がステンレス材料の表面組織に与える影響
著者:
馬渕 靖宏,玉古 博朗,金田 潤也,山下 理道,宮川 雅彦
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It is revealed that Stress Corrosion Cracking (SCC) on the surface of the L-grade stainless steels in Nuclear Power Plants is caused by heavily cold work of the materials. The microstructure, hardness and residual stress on the surface of the material are factors for SCC initiation. There are surface treatment methods that is effective reduction on SCC such as Flap Wheel (FW) polishing, Clean N Strip (CNS) polishing, Water Jet Peening (WJP) and Shot Peening(SP). In this paper, the characteristics of the su...
英字タイトル:
Effects of Surface Treatments on Microstructure in Stainless Steel
第6回
計画保全の保全基盤構築のシステム化
著者:
緒形 次郎,Jiro OGATA
発刊日:
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The maintenance history which applied and accumulated long years, and its analysis and evaluation are required for construction of maintenance base parts, such as “apparatus importance evaluation“ indispensable to planned maintenance, and “a management standard by apparatus.“ Based on the actual result of having cultivated construction of t his maintenance base portion into the Asahi Chemical Industry group this time, as a creation tool of “it is well-grounded “apparatus importance evaluation““ and “the ma...
英字タイトル:
Systematization of Maintenance Base in Planned Maintenance System
第6回
超短パルスレーザーによるFBG センサの製作と性能評価
著者:
島田 幸洋,Yukihiro SHIMADA,西村 昭彦,Akihiko NISHIMURA,猿田 晃一,Koichi SARUTA,月森 和之,Kazuyuki TSUKIMORI,小林 喬郎,Takao KOBAYASHI
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Fiber Bragg Grating (FBG) is the periodic refractive-index structure in an optical fiber core, where the light of a specific wavelength is reflected. It can be used as te mperature or a distorted sensor by measuring change of the reflective wavelength of FBG. We processed FBG using a Chirped Pulse Amplification titanium sapphire laser. As a result, the peak intensity of reflective spectrum has been successfully improved from -40 dB to -24 dB. Heating test under operational temperature of Fast Breeder React...
英字タイトル:
Fabrication and performance assessment of FBG sensor with pulse laser processing
第6回
超高サイクル疲労における内部起点型き裂の伝播機構
著者:
中村 孝,Takashi NAKAMURA,小熊 博幸,Hiroyuki OGUMA
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This study carried out uniaxial tension fatigue tests of Ti-6Al-4V focusing on sub-surface fractures in very high cycle regime. Crack growth properties in high vacuum were also investigated to simulate sub-surface crack propagation, which is kept away from atmosphere in principle. F racture surfaces were closely compared between the sub-surface crack and the crack propagated in vacuum. As a result, it was clarified that crack growth rate in vacuum was much lower than that in air, which corresponded to long...
英字タイトル:
A Mechanism of Sub-Surface Crack Growth in Very High Cycle Fatigue
第6回
超高速二相流によりオリフィス下流域に発生するエロージョン現象の解明（２）
著者:
梅原 真弘,Masahiro UMEHARA,阿部 祐子,Yuko ABE,結城 和久,Kazuhisa YUKI,戸田 三朗,Saburo TODA,秋葉 真司,Shinji AKIBA
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Pipe wall thinning is one of the most important technical problems in nuclear power plants. For example, the wall thinning occurs by two-phase flow at both the orifice downstream and the first elbow located downstream after the orifice. In this study, a visualization experiment was conducted in order to clarify the detailed mechanism of the wall thinning by erosion (LDI is expected) in the piping system consisting of an orifice, a straight pipe and an elbow.In the experiment a strong pressure at the down ...
英字タイトル:
Analysis (2) of Liquid Droplets Impact Erosion at the orifice downstream area caused by supersonictwo-phase flow
第6回
転がり軸受加速劣化試験
著者:
川畑 雅彦,Masahiko KAWABATA,佐々木 義憲,Yoshinori SASAKI
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In Japan the maintenance method of the nuclear plant is mainly time based maintenance (TBM), therefore the reliability and the health of equipment have been secured by periodical maintenance. However, in the new inspection rule which starts from January 2009, with the rise of the expectation for CBM (Condition Based Maintenance) which identify the condition of facilities or equipme nts during operation, advancement of maintenance technology and condition monitoring technology have been demanded. In the nuc...
英字タイトル:
Accelerated Deterioration Test of Roller Bearings
第6回
軽水型原子炉給水用高精度超音波流量計の開発と現状
著者:
森 治嗣,Michitsugu MORI,木倉 宏成,Hiroshige KIKURA,武田 靖,Yasushi TAKEDA
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The licensing processes on uprating of current light water reactors (LWRs) are classified into three categories by US NRC, one of which is the uprating by MU, Measurement Uncertainty Recapture, targeting the uprating up to 2%. MU is enabled by the measurement-accuracy improvement of a feedwater flowmeter with 0.5~1.7% without issues arising from safety matters and remodeling equipment. Time-of-flight type ultrasonic flowmeters have been widely used in industries. However, it has to be considered the tracea...
英字タイトル:
Current Status on High-accuracy Ultrasonic Flowmeter Development for FeedwaterFlow Rate Measurements in Light Water Reactors
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