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論文
オーステナイト系ステンレス鋼の高ひずみ速度による 微視的残留応力
著者:
鈴木 賢治,Kenji SUZUKI,田邊 裕治,Yuji TANABE,菖蒲 敬久,Takahisa SHOBU
発刊日:
公開日:
キーワードタグ:
Austenitic stainless steel (SUS316L) was used as specimen material, and the plate specimens were deformed plastically with a wide range of strain rates (6.67×10-5~ 6.70×102 /s). The residual micro-stress for each lattice plane was measured with hard synchrotron X-rays. The residual macro-stress due to tensile deformation de- pended on strain rate. The residual micro-stresses varied from tension to compression, depending on the dif- fraction elastic constant. The soft lattice plane had tensile residual...
英字タイトル:
Residual micro-stresses in austenitic stainless steel due to high strain rate
論文
スマートアレイプローブの開発と実機への適用性
著者:
前田 功太郎,Kotaro MAEDA,下根 純理,Junri SHIMONE,赤川 純一,Junichi AKAGAWA,永田 泰章,Yasuyuki NAGATA,原田 豊,Yutaka HARADA,瀬良 健彦,Takehiko SERA,平野 伸朗,Shinro HIRANO
発刊日:
公開日:
キーワードタグ:
In 1999, NEL developed the transmit-receive type ECT array probe for steam generator (SG) tubing, called “X-probe”, in cooperation with foreign firms. Recently NEL has developed the advanced ECT array probe, “Smart Array Probe”, characterized with a significantly improved resolution for circumferential cracks. The doubled channels in the circumferential mode have greatly improved the circumferential resolution of Smart Array Probe. With all the circumferential mode channels on the same circle, there i...
英字タイトル:
Development and Field Practical Performance of Smart Array Probe
論文
ポンプ静止翼の脈動励振のメカニズムと対策
著者:
宮野 廣,Hiroshi MIYANO,奈良林 直,Tadashi NARABAYASHI,萩原 剛,Takeshi HAGIWARA
発刊日:
公開日:
キーワードタグ:
Many studies about the vibration of rotating vane of turbine had been performed. As in this paper, it was observed on a centrifugal pump operation that stationary part, ring-hat disk vane was vibrating, then it was studied that a mechanism of the phenomena was presumed from the vibration mechanism of turbine vanes.he experimental studies by using actual pump and analytical studies were performed. It was made clear that the interference between pump vanes and pump volute water cuts generate turbulence...
英字タイトル:
Cause and Countermeasure of Stationary Disk Vibration Damage in Centrifugal Pump
論文
原子力発電所における新溶接補修技術の 迅速な適用プロセスの検討
著者:
平野 伸朗,Shinro HIRANO,瀬良 健彦,Takehiko SERA,千種 直樹,Naoki CHIGUSA,于 麗娜,Lina YU,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
発刊日:
公開日:
キーワードタグ:
Abstract For the last couple of years, issue of defects in Alloy 600 weld lowered the capacity factor of nuclear power plants. To apply newly developed repair technique, like temper-bead welding that has not been prescribed in technical standards, it is necessary to evaluate its technical applicability to the requirement. In the previous cases, this process has been completed by issuance of no action letter for specific area and condition, utilizing implementation process, such as confirm testing by J...
英字タイトル:
Study on implementing newly developed repair welding technique within a limited time frame for nuclear power plant
論文
固相接合を用いた 電磁非破壊検査のための模擬応力腐食割れ試験体製作技術
著者:
遊佐 訓孝,Noritaka YUSA,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
This study proposes a method to fabricate an artificial defect that is almost identical to stress corrosion cracking from the viewpoint of electromagnetic nondestructive evaluations. The key idea is to realize a region having electrical resistance embedded inside a conductive materials using solid state bonding. A rough region is introduced into the surface of the materials to be bonded so that the region is partially bonded to realize electrical resistance. Experimental demonstrations are carried out...
英字タイトル:
Fabrication of imitative stress corrosion cracking specimens suitable for electromagnetic nondestructive evaluations using solid state bonding
論文
大規模複雑プラントシステムにおける保全活動の有効性 評価手法に関する研究
著者:
青木 孝行,Takayuki AOKI
発刊日:
公開日:
キーワードタグ:
If we try to check the effectiveness of maintenance activities in nuclear power plant, it is necessary to evaluate plant performance from the viewpoint of nuclear safety and economy efficiency. So, the relation among maintenance performance targets, maintenance performance indicators and maintenance key parameters important to nuclear safety and economic efficiency was made clear, and then a method to evaluate the effectiveness of maintenance activities was discussed. As a result of consideration, it ...
英字タイトル:
Study on how to evaluate the effectiveness of maintenance activities for giant complex plant system
論文
過大予荷重による SCC,疲労及び水素脆性き裂の 進展阻止とき裂の無害化
著者:
高橋 宏治,Koji TAKAHASHI,佐野 勇人,Hayato SANO,北條 恵司,Keiji HOUJYOU,橋倉 靖明,Yasuaki HASHIKURA,水上 博嗣,Hiroshi MIZUKAMI,安藤 柱,Kotoji ANDO
発刊日:
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キーワードタグ:
This study proposes an innovative method for arresting SCC, fatigue and hydrogen assisted cracks, and making harmless the cracks by overload. By overloading, compressive residual stress is introduced ahead of the crack. The residual stress reduces K values and arrests the crack. By the method, KISCC, KIHE and ?Kth increase with increasing Kov (K value by overload) and the notional threshold values were given by　the equation: NKISCC, NKIHE and ? NKth=Ｃ + ＤKov. Where Ｃ is KISCC, KIHE and ?Kth(in the case of ...
英字タイトル:
Arrest of SCC, Fatigue and Hydrogen Assisted Cracks, and Make Harmless the Cracks by Overload
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