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第12回
海外での廃止措置経験の軽水炉（PWR）への展開
著者:
堀川 義彦,Yoshihiko HORIKAWA,片岡 秀郎,Hideo KATAOKA,松枝 啓之,Keiji MATSUEDA
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Pressurized Water Reactors (PWR) such as Mihama Nuclear Power Plant Unit 1, Unit 2 and Genkai nuclear Power Plant Unit 1 finished their commercial operation on April 27th this year and have been preparing for their decommissioning. So far there have not experienced the decommissioning of PWR plant in Japan. On the other hand, more than ten PWR plants have completed their decommissioning and /or been under decommissioning in the USA & Europe and a lot of decommissioning experiences from their activities...
英字タイトル:
Applying Decommissioning Experiences in the foreign countries to Japanese PWR plants
第12回
熱成層界面ゆらぎに対する 熱応力評価法と疲労損傷評価法の開発
著者:
栗林 大,Hiroshi KURIBAYASHI,鈴木 正昭,Masaaki SUZUKI,笠原 直人,Naoto KASAHARA
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In nuclear power plants, a lot of failure cases by high cycle thermal fatigue are reported, which is induced by temperature fluctuation of the coolant. To ensure the safety of nuclear power plants, thermal fatigue should be evaluated adequately. To evaluate thermal fatigue, frequency response functions were developed by Kasahara et al... These functions were derived theoretically to calculate thermal stress caused by thermal striping and thermal stratification oscillation, which are main causes of high...
英字タイトル:
Development of thermal stress evaluation method and fatigue damage evaluation method for thermal stratification oscillation
第12回
燃料デブリの特性に関する研究概要
著者:
鷲谷 忠博,Tadahiro WASHIYA,荻野 英樹,Hideki OGINO,高野 公秀,Masahide TAKANO,矢野 公彦,Kimuhiko YANO,鍛治 直也,Naoya KAJI
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Abstract JAEA, as a member of IRID, had started experimental and analytical studies on characterization of fuel debris. In this study, thermodynamic equilibrium calculations were carried out and typical debris phases were predicted. Experimental studies were also carried out using simulated fuel debris, and verify the expected fuel debris properties on typical conditions of Fukushima Daiichi Nuclear Power Station (1F). The 1F accident differs from the past severe accidents such as Three Mile Island uni...
英字タイトル:
Research Summary on the Characterization of Fuel Debris
第12回
特定重大事故等対処施設の課題と短期対応の対策案について
著者:
今野 隆博,Takahiro KONNO,佐々木 宏,Hiroshi SASAKI,串間 由紀子,Yukiko KUSHIMA
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NRA demands that specific safety facility (SSF) shall be built because of the lesson and learn of the accident in the Fukushima Nuclear Power Plant. As for the completion of SSF, the postponement of five years was permitted from the enforcement of the regulation. However, it is the difficult situation to end SSF construction in the grace period by the delay of reviewing application documents. Therefore Japan society of maintenology demands the extension of the grace period on the regulation side and, o...
英字タイトル:
Issues of specific safe facility and short-term countermeasures.
第12回
疲労損傷予測のための荷重と強度の一貫評価
著者:
笠原 直人,Naoto KASAHARA,鈴木 正昭,Masaaki SUZUKI
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Thermal fatigue failure and vibration fatigue failure occur frequently in spite of well known. Because they are complicated multi-physics phenomena. Furthermore, there are many influence factors in both of loadings and strength. For design, conservative evaluation methods were applied to both loadings and strength. However, best estimation with uncertainty evaluation are suitable for trouble shootings and risk analyses. To satisfy above requirements, authors propose a total evaluation of loadings and s...
英字タイトル:
Total evaluation of loadings and strength for fatigue damage prediction
第12回
発電所内ネットワークおよび電子携帯端末を活用した 保全技術の高度化
著者:
大谷 洋平,Yohei OTANI,長谷川 健,Takeshi HASEGAWA,星野 真輝,Masateru HOSHINO,加藤 貴久,Takahisa KATO,横井 美香,Mika YOKOI
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Toshiba has developed and adopted wired and/or wireless maintenance network at nuclear power plant in cooperate with industry. Toshiba also developed a tablet PC based field testing tool that enables to display test procedures and record test results in the field to improve the efficiency of such testing. Recently, we have adopted remote desktop protocol that enables to support the operator. ...
英字タイトル:
Improvement of Maintenance Engineering Using Plant Network and Personal Digital Assistant
第12回
磁性材料に関する電磁超音波探触子を用いた.. 超音波送信機構の解析..
著者:
中島 大岳,Hirotaka NAKAJIMA,古澤 彰憲,Akinori FURUSAWA,小島 史男,Fumio KOJIMA
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The aim of this work presented here is to analyze the mechanism of ultrasonic test signals in magnetic materials using electromagnetic acoustic transducer (EMAT). The coupling mechanism for EMAT between the electromagnetic fields and the applied excitation of ultrasonic wave are investigated. First, a nonlinear magnetic model in two dimensions is presented for the coupling mechanism. Secondly, the coupling mechanisms in ferromagnetic materials are studied analytically and numerically. Finally, the nume...
英字タイトル:
Analysis of Ultrasonic Source in Magnetic Materials Using Electromagnetic Acoustic Transducer
第12回
磁気センシングによる材質劣化・微小欠陥の 同時非破壊評価技術開発
著者:
菊池 弘昭,Hiroaki KIKUCHI,清水 勇,Isamu SHIMIZU,岩田 圭司,Keiji IWATA
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The possibility of simultaneously nondestructive evaluation for material deterioration and detecting sub-mm sized small defect were investigated using magnetic methods. The magnetic hysteresis properties and the distributions of leakage magnetic field were measured by a magnetic yoke and a magnetic field sensor. The hysteresis loop measurement was sensitive to deterioration in material and scanning flux distribution was effective for detection of sub-mm sized defect. The deterioration and small defect ...
英字タイトル:
Simultaneously nondestructive evaluation of degradation and defect in sub-mm size using magnetic sensing techniques
第12回
福島復興に向けた遠隔技術への取り組み
著者:
米谷 豊,Yutaka KOMETANI,大谷 健一,Kenichi OTANI,木下 博文,Hirofumi KINOSHITA
発刊日:
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Since the accident at Fukushima Daiichi Nuclear Power Station of the Tokyo Electric Power Company, reconstruction work at Fukushima has needed to deal with high radiation environments and has demanded new technologies. This requires the development of remote-controlled robots capable of rubble removal, radiation measurement, and other technologies, as well as ways of utilizing these technologies in tandem. It is also necessary to conduct a site survey (including the visual assessment, identification of...
英字タイトル:
Development of remote-controlled robot technology for the Fukushima Reconstruction
第12回
福島第一ミュオン透過法による原子炉調査
著者:
高﨑 史彦,Fumihiko TAKASAKI,溝上 伸也,Shinya MIZOKAMI,永野 護,Mamoru NAGANO
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For decommissioning and contaminated water countermeasures in Fukushima Daiichi NPS, we identify locations and mounts of fuel debris in RPV using muon technologies, and it is intended to contribute to the selection of an efficient fuel removal methods. Therefore we conducted muon measurement using Attenuation Method at Unit-1, and we confirmed that Muon measurement for the investigation of damaged reactor is promising technology. And the measurement results at Unit-1 suggested the non-existence of fuel...
英字タイトル:
Inspection of the damaged reactor at the Fukushima Daiichi with the cosmic muon radiography
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