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論文
ナトリウム中に噴出する不活性ガス不足膨張衝突噴流の 局所構造と対応するエロージョン試験法の開発
著者:
工藤 秀行,Hideyuki KUDOH,太田 淳己,Junki OHTA,杉山 憲一郎,Ken-ichiro SUGIYAMA,奈良林 直,Tadashi NARABAYASHI,大島 宏之,Hiroyuki OHSHIMA,栗原 成計,Akikazu KURIHARA
発刊日:
公開日:
キーワードタグ:
When a heat transfer tube wall in a steam generator of a sodium-cooled fast reactor fails, high-pressure steam leaks into low-pressure liquid sodium side. Then the high-temperature and highly corrosive reaction jet causes secondary failures of neighboring heat transfer tubes. The objective of the present study is to develop an experimental method to obtain data that is necessary to validate and improve a safety evaluation code on the sodium?water reaction. In the present paper, the methods of sodium?...
英字タイトル:
Development of Erosion Test Methods on Underexpanded Inert-Gas Impinging Jets Injected in Liquid Sodium
論文
レーザ干渉計を用いた非接触 AE 法による 軸受の欠陥計測
著者:
大田 恭史,Yasufumi OHTA,猿田 晃一,Koichi SARUTA
発刊日:
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キーワードタグ:
Abstract: In order to investigate the relationship between the defect size and the corresponding AE parameters, we carried out laboratory tests using a rotating machine and bearing specimens. The rotational speed is 837 rpm and the size of defect diameter of the specimens ranges from 0.25 mm to 1.00 mm, in 0.25 mm steps. AE signals caused from interaction between balls and defects are measured at the rotating shaft using a laser interferometer and also measured on the bearing housing by a piezoelectri...
英字タイトル:
Defects measurement of bearings by non-contact acoustic emission method using a laser interferometer
論文
応力改善工法で付与される圧縮残留応力の持続性
著者:
西川 聡,Satoru NISHIKAWA,大北 茂,Shigeru OKITA,山口 篤憲,Atsunori YAMAGUCHI
発刊日:
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キーワードタグ:
Stress improvement processes are countermeasures against stress corrosion cracking in nuclear power plant components. It is necessary to confirm whether compressive residual stress induced by stress improvement processes can be sustained under operation environment. In order to evaluate stability of the compressive residual stress in 60-year operating conditions, the 0.07% cyclic strains of 200 times at 593 K were applied to the welded specimens, then a thermal aging treatment for 1.66×106 s at 673 K...
英字タイトル:
Sustainability of compressive residual stress by stress improvement processes
論文
溶接施工の乱れや手直し溶接が残留応力分布に及ぼす 変動程度の評価
著者:
瀬良 健彦,Takehiko SERA,平野 伸朗,Shinro HIRANO,千種 直樹,Naoki CHIGUSA,岡野 成威,Shigetaka OKANO,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
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Abstract Various research projects have been conducted on the residual stress distribution in the pipe weld since it is important to evaluate SCC initiation, or to evaluate structural integrity. Our previous report noted the necessity of considering the influence of complicated residual stresses in multi-path weld joint in order to enhance the evaluation of long-term reliability of mitigated stress. This paper describes the evaluation result about the changes in residual stress caused by variations in...
英字タイトル:
Evaluation of varying extent on the residual stress distribution by effect of varied welding application and repair welding
論文
電磁超音波共鳴法による配管減肉のオンラインモニタリング
著者:
浦山 良一,Ryoichi URAYAMA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,兼本 茂,Shigeru KANEMOTO
発刊日:
公開日:
キーワードタグ:
The electromagnetic acoustic resonance (EMAR) method provides accurate and stable evaluation in high temperature environment, and it is an effective tool for online monitoring. In this study, the EMAR method and the superposition of the nth compression (SNC) for data processing are applied to online monitoring of pipe wall thinning, and the accuracy and reliability of the measurements are demonstrated through field tests using a large-scale corrosion test loop at high temperature. To measure the thic...
英字タイトル:
Online Monitoring of Pipe Wall Thinning with Electromagnetic Acoustic Resonance Method
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