99件が見つかりました。

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第3回
マイクロ波による水中におけるき裂の定量評価
著者:
巨 陽,Yang JU,宮津 亨,Toru MIYADU,祖山 均,Hitoshi SOYAMA,坂 真澄,Masumi SAKA
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キーワードタグ:
Quantitative evaluation of small cracks in stainless steel under water which was use to simulate the environment of u nclear reactor was demonstrated. The crack depth was evaluated by the means of the microwave dual frequency technique , and the crack closure stress was estimated based on the compliance technique. The cracks were detected significant ly with larger closure stress and the effect of the closure stress to the evaluation of crack depth was investigated....
英字タイトル:
Nondestructive Evaluation of Cracks under Water by Microwaves
第3回
マルチ化した一様渦電流プローブの開発と SCC 探傷特性評価
著者:
福岡 克弘,Katsuhiro FUKUOKA,橋本 光男,Mitsuo HASHIMOTO
発刊日:
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In this research, a uniform eddy current multi-probe to apply to the complex structure and inspect the cracks at high-speed data ac quisition was developed. Pick-up coils of the developed probe were arranged on a flexible printed circuit board. It was confirmed t hat the SCC (stress corrosion cracking) of real flaw was able to be detected with developed uniform eddy current multi-probe by usin g the ferrite core for the exciting coil and considering the impedance matching of the exciting coil and the flaw ...
英字タイトル:
Development of uniform eddy current multi-probe and characteristic evaluation of SCC detection
第3回
モデル・データ・検査技術融合に基づく炉内材料劣化に関する研究開発
著者:
沖田 泰良,Taira OKITA,関村 直人,Naoto SEKIMURA,礒部 仁博,Yoshihiro ISOBE
発刊日:
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The recent situation of nuclear power generation gradually requires not only the economic viewpoint but also even greater efforts in accurate evaluations on safety and availability issues. Accordingly, assessments on the integrity of structural components are critical both now and in the future. Structural materials which suffer from age-related degradations especially should have methods to evaluate degradations due to changes in material properties. It is clear that conventionally used extrapolations of...
英字タイトル:
Integration of modeling, database and inspection technique for the prediction of the material behavior under irradiation
第3回
リスク評価応用保全計画支援システムの開発
著者:
竹澤 伸久,Nobuhisa TAKEZAWA,牟田 仁,Hitoshi MUTA,中原 克彦,Katsuhiko NAKAHARA
発刊日:
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A system has been developed for the plant maintenance planning that evaluates both plant integrity and economical efficiency. Estimating the unplanned shutdown frequency, the total maint enance cost and its net present value (NPV) on the basis of Probabilistic Risk Assessment techniques, this system supports the optimization of the maintenance planning. To verify the anal ysis models of this system, we calculated the unplanned shutdown frequencies of the present nuclear power plants by using the published ...
英字タイトル:
Development of Risk-based Maintenance Planning Support System
第3回
中高温度の塩素含有環境下における金属材料の腐食と防食
著者:
松田 宏康,Hiroyasu MATSUDA
発刊日:
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1.緒言我が国の石油精製を含む化学工業全体に おける'97 年の腐食コストは、約1兆円であ り、売上高 67 兆円の 1.6%を占める。これ は、'74年時の腐食コスト 1500 億円の約 6 倍であり、売上高 19 兆円の 0.8%と比較し 2倍に増えている)。また、既存の腐食防 食技術で損傷全体 の 25%は解決できると言 われているが 、20 年前から腐食傾向に変化 はない 2)。その原因の一つとして、石油化 学プラントでは、腐食形態および腐食環境 が多種多様であることである。中でも、塩 素による腐......
英字タイトル:
Metal corrosion and the prevention at medium-high temperature in chloride environments
第3回
交流磁化法に基く片状黒鉛鋳鉄におけるチル組織含有量の評価
著者:
松川 淳,Jun MATSUKAWA,内一 哲哉,Tetsuya UCHIMOTO,阿部 利彦,Toshihiko ABE,高木 敏行,Toshiyuki TAKAGI,佐藤 武志,Takeshi SATO,池 浩之,Hiroyuki IKE,高川 貫仁,Takahiro TAKAGAWA,堀川 紀孝,Noritaka HORIKAWA
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This study proposes a novel nondestructive evaluation method of chill contents in gray cast irons by means of AC magnetization method. For the purpose, magnetic properties of cast irons w ith different chill contents were evaluated by B-H loop analyzer. Results were discussed in view of matrices and graphite, and it was found that some magnetic parameters, especially B-H l oop area, correlate well with ratio of cementite area to graphite one. Focusing on the fact, AC magnetic method was applied to evaluati...
英字タイトル:
Evaluation of Chill Contents in Flaky Cast Irons Based on AC Magnetization Method
第3回
交流透磁率を用いた強磁性材料の機械特性評価
著者:
菊池 弘昭,Hiroaki KIKUCHI,荒 克之,Katsuyuki ARA,鎌田 康寛,Yasuhiro KAMADA,小林 悟,Satoru KOBAYASHI,高橋 正氣,Seiki TAKAHASHI
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キーワードタグ:
Magnetic properties derived from major hysteresis loops are sensitive to the microstructures of iron-based steels and have therefore been used for nondestructive evaluation of degradation in ferromagnetic materials contained in structural components. A permeability obtained from ac small field excitation may be a more us eful parameter than one obtained from a major hysteresis loop from the viewpoints of electricity consumption and real-time measurement. In this paper, the relati on between the ac permeabi...
英字タイトル:
Evaluation for Mechanical Properties of Ferromagnetic Steels by AC Permeability
第3回
人工物保全のための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,中沢 正治,Masaharu NAKAZAWA,下村 芳樹,Yoshiki SHIMOMURA,石 伯軒,Boxuan SHI
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Abstract In the environment such as outer space where we cannot maintain the artifacts, it is the robustness that is important for artifacts. Thus the system which has the information processing circui t realizing self-maintenance function is desirable. So far some approach is tried to realize self-maintenance function using the qualitative reasoning technique. In this study, we try to apply distribu ted information processing technique to this qualitative reasoning information processor, by arranging many...
英字タイトル:
Self-Maintenance Sensor Network Based on Mutual Communications With Reliability Index
第3回
保全に関する定量的解析手法に関する研究
著者:
肥田 茂,Shigeru HIDA,清水 高,Takashi SHMIZU
発刊日:
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This study is examination of the quantitive valuation method of maintenance activities of a nuclear powe r plant. Therefore, the concept of the maintenance equation that examination was advanced in the Japan S ociety of Maintenology or the Japan Society of Mechanical Engineers (JSME) was arranged. Basic examinati on for a maintenance equation to formulize the above-mentioned examination to reference was carried out....
英字タイトル:
Study on the quantitive analysis approach for maintenance
第3回
保全の最適化に向けた取り組み
著者:
橋本 哲,Satoshi HASHIMOTO
発刊日:
公開日:
キーワードタグ:
Abstract: Japanese nuclear utilities just started a joint effort for maintenance optimization, in which a set of standard processes and common technical bases for maintenance program justificati on will be designed, developed and maintained. The effort is expected to contribute not only to acceleration of individual effort, but also to improvement of total plant safety and reliability....
英字タイトル:
Approach for maintenance optimization by Japanese nuclear utilities
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