127件が見つかりました。

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第14回
Stress Generation Mechanism of Elbow Pipes Due to Thermal Stratification
著者:
サルマンアラカン,Salman ALRAKAN,栗林 大,Hiroshi KURIBAYASHI,笠原 直人,Naoto KASAHARA
発刊日:
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キーワードタグ:
In nuclear power plants, the structural components that are in contact with coolant are susceptible to thermal loads due to the change in the fluid temperature. If the heating and cooling processes are cyclic, the structure will endure thermal fatigue that may lead to failure. Thermal stratification is one of the main loads that can lead to high cycle thermal fatigue damage. The Japan Society of Mechanical Engineers, (JSME) have published the evaluation guideline for high cycle thermal fatigue. It treat...
英字タイトル:
Stress Generation Mechanism of Elbow Pipes Due to Thermal Stratification
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第14回
316ステンレス鋼の炉水環境中での疲労き裂進展 におけるひずみ速度の影響
著者:
能勢 昂尚,Takahisa NOSE,北田 孝典,Takanori KITADA,竹田 敏,Satoshi TAKEDA,中村 隆夫,Takao NAKAMURA,釡谷 昌幸,Masayuki KAMAYA
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The purpose of this study is to investigate environmental effects on low cycle fatigue crack growth rate of SUS316 in different strain rate condition. The fatigue tests were conducted under different strain rate (0.4%/sec and 0.004%/sec) in simulated PWR environment with interrupting tests and the surface of specimens was observed. By the investigation of fatigue cracks growth, the effect of strain rate on crack growth rate was evaluated. From the results of tests, the followings were confirmed; ・Fatigu...
英字タイトル:
Influence of Strain Rate on Fatigue Crack Growth in SUS316 under Reactor Coolant Environment
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第14回
600 合金部 SCC に対する予防保全工事(WJP 工事)
著者:
岸 真之,Masayuki KISHI
発刊日:
公開日:
キーワードタグ:
加圧水型原子炉(PWR)の高経年化に伴い、応力腐食割れなどのように運転時間に伴い顕在化する損傷が 海外・国内ともPWRプラントにて確認されている。ここでは、プラント設備の保全技術として 高ニッケル合金の応力腐食割れ対策に着目し、ウォータージェットピーニング(WJP)による応力改善技術を紹介する。...
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第14回
ASRポテンシャル評価のための骨材試験方法に関する評価
著者:
江藤 淳二,Junji ETOH,落合 孝正,Takamasa OCHIAI,小川 彰一,Shoiti OGAWA,渋谷 和俊,Shibuya KAZUTOSHI,丸山 一平,Ippei MARUYAMA,山田 一夫,Kazuo YAMADA,滝沢 真之,Masayuki TAKIZAWA
発刊日:
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Test method has not been maintained for late-expansive aggregates (which cause cracks in concrete after 10 years or more), in addition to the early-expansive aggregates which have been considered as the major cause of ASR in Japan. In order to confirm the effectiveness of the aggregate test method of JNES flow (the method mainly composed of international methods RILEM AAR - 3 and AAR - 4) and to prepare applicable aggregate test method, we conducted comparative tests using domestic and foreign aggregate...
英字タイトル:
Evaluation on Aggregate Testing Method for ASR Potential Evaluation
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第14回
BWRプラントにおける 上部格子板の照射誘起応力腐食割れ評価の適正化
著者:
三橋 忠浩,Tadahiro MITSUHASHI,服部 泰大,Yasuhiro HATTORI,大木 俊,Suguru OOKI,神長 貴幸,Takayuki KAMINAGA,渡辺 義雄,Yoshio WATANABE,内山 好司,Koji UCHIYAMA
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As for BWR, Core components made of austenitic stainless steels where IASCC is assumed are Top Guide, Core Shroud and Core Plate. Since Top Guide has been exposed to high flux of neutron irradiation during plant operation, the evaluation method should be established using reasonable and proper evaluation conditions. Based on this background, study on evaluation method for Top Guide was performed in this research as described below. ...
英字タイトル:
Optimizing evaluation method of irradiation-assisted stress corrosion cracking in Top Guide of BWR
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第14回
Detection of Insiders’ Sabotage using Time-Series Data Analysis of Hand Motion
著者:
陳 実,Shi CHEN,出町 和之,KazuyuNi DEMACHI
発刊日:
公開日:
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The importance of nuclear security increased after FuNushima Daiichi nuclear power plant accident. Especially as a threat to nuclear power plants, sabotage by insider is worthy of attention. In response to this situation, hand motion is an important part of human activity and it has high contribution to high-accuracy detection of insiders’ sabotage. Moreover, Time series data analysis is a useful method in abnormal behavior detection. In this research, the real-time hand motion detection system was develope...
英字タイトル:
Detection of Insiders’ Sabotage using Time-Series Data Analysis of Hand Motion
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第14回
Palo Verde 発電所と Diablo Canyon 発電所の FLEX 機器に関する事例調査
著者:
大久保 友輝夫,Yukio OHKUBO
発刊日:
公開日:
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One of the primary lessons learned from the accident at Fukushima Dai-ichi was the significance of the challenge presented by a loss of safety related systems following the occurrence of a beyond-design-basis external event. In the case of Fukushima Dai-ichi, the extended loss of alternating current power (ELAP) condition caused by the tsunami led to loss of core cooling and a significant challenge to containment. NRC and NEI made an approach for adding diverse and flexible mitigation strategies-or FLEX- ...
英字タイトル:
Survey of Palo Verde Nuclear Power Plant and Diablo Canyon Nuclear Power Plant
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第14回
PIRT手法を用いた研究開発段階発電用原子炉の保守管理における要検証劣化メカニズムの抽出方法に関する検討
著者:
髙屋 茂,Shigeru TAKAYA,近澤 佳隆,Yoshitaka CHIKAZAWA,田中 正暁,Masaaki TANAKA
発刊日:
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In a previous paper, the authors discussed maintenance management suitable to R&D-level nuclear power plants, and made proposals. One of key proposals was to enhance knowledge on potential degradation mechanisms specific to a new reactor type by accumulating operational experience. It was noted that validation of R&D knowledge in actual plant conditions is important. In this study, a method for identifying degradation mechanisms to be validated by the PIRT (Phenomena Identification and Ranking Table) p...
英字タイトル:
Study on a Method for Identifying Degradation Mechanisms to be Validated in Maintenance Management of R&D-Level Nuclear Power Plants Using the PIRT Process
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第14回
RPV 監視試験片の再生方法における 電子ビーム溶接の適用性評価
著者:
山岡 鉄史,Tetsushi YAMAOKA,森島 康雄,Yasuo MORISHIMA,小川 琢矢,Takuya OGAWA,豊田 哲也,Tetsuya TOYOTA,石嵜 貴大,Takahiro ISHIZAKI,櫻谷 誠司,Seiji SAKURAYA,神長 貴幸,Takayuki KAMINAGA,大木 俊,Suguru OOKI
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Additional RPV surveillance tests are required to extend the operation license of nuclear power plants under the new regulation. Since the number of surveillance test specimens is limited, it is important to establish a reconstitution technique of the surveillance test specimen using the remaining undeformed part of the tested specimen. To evaluate the applicability of electron beam welding, the confirmatory tests such as Charpy impact tests were conducted using unirradiated test specimens reconstituted ...
英字タイトル:
Evaluating the Applicability of Electron Beam Welding to Reconstitution Method of RPV Surveillance Test Specimen
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第14回
SAFER 基地の見学と NRC リージョンIIIでの意見交換
著者:
山崎 謙吾,Kengo YAMAZAKI
発刊日:
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The SAFER facility is to be established as a third step to support FLEX as a measure to obtain sufficient resources from outside the site in order to maintain the mitigation function indefinitely. That is, the first stage corresponds to permanent equipment for 8 hours from the event, the second phase corresponds to the support by portable equipment in the site (8 to 24 hours), the third stage corresponds to support of SAFER (after 24 hours ). For this reason, it is a requirement to carry the necessary...
英字タイトル:
Overview of SAFER facilities and exchange of opinions at NRC region III