127件が見つかりました。

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第14回
磁力吸着壁面移動機構に関する基礎研究
著者:
石原 秀則,Hidenori ISHIHARA,坂本 丈尚,Tomonao SAKAMOTO,松井 隆,Takashi MATSUI
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We considered painting of the inner wall of the containment vessel of the reactor and maintenance of the welded part are important. Therefore, we are developing a wall running robot which can paint walls and maintain welded parts even at elevated places. A magnet was used as a tire to make it an adsorption mechanism and a follower. A mechanism that does not use magnets is used for the drive wheels. In the conventional wall motion robot, it was impossible to overcome corner steps. Also, although forward an...
英字タイトル:
Basic research on magnetic force adsorption wall motion mechanism
第14回
社会インフラ診断へのPFMの適用検討
著者:
礒部 仁博,Yoshihiro ISOBE,藤吉 宏彰,Hiroaki FUJIYOSHI,松永 嵩,Takashi MATSUNAGA,小川 良太,Ryota OGAWA,匂坂 充行,Mitsuyuki SAGISAKA,松本 聡司,Satoshi MATSUMOTO,高坂 徹,Toru KOSAKA,吉村 忍,Shinobu YOSHIMURA
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Special attentions have been increasingly paid for the diagnosis of social infrastructures after the collapse of ceiling of Sasago tunnel of Chuo Expressway. It is reported that the main cause was due to the age-related degradation of chemical anchors. Chemical anchors are also frequently used in nuclear power stations. Here we have been trying to apply PFM (Probabilistic Fracture Mechanics) to the diagnosis of social infrastructures using Dr. Mainte, an integrated simulator to optimize maintenance activi...
英字タイトル:
A Study of Application of PFM (Probabilistic Fracture Mechanics) to the Diagnosis of Social Infrastructures ]
第14回
福井県における原子力機構によるレーザー研究開発と産業振興
著者:
古澤 彰憲,Akinori FURUSAWA,竹仲 佑介,Yusuke TAKENAKA,西村 昭彦,Akihiko NISHIMURA,水谷 春樹,Haruki MIZUTANI,村松 壽晴,Toshiharu MURAMATSU
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Industry development activities on applied laser research held at Fukui branch of Japan Atomic Energy Agency are reported. Industry development is inevitable in long-term vision and strategy for developing maintenance technology and establishing decommissioning technology. Fukui branch of JAEA has organized public seminar offering businesses to promote these activities and technology exchange for years. Here some examples offered in the current seminar are introduced concerning with laser technology. Fin...
英字タイトル:
Industry Development Activities and Applied Laser Research Activities at Fukui Branch of Japan Atomic Energy Agency
第14回
福島事故を踏まえたレジリエンスマネジメントの考察
著者:
川村 慎一,Shinichi KAWAMURA,奈良林 直,Tadashi NARABAYASHI
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Management for resilience of nuclear safety in severe accidents was studied based on the lessons learned from the emergency responses at FuNushima Daini NPP and FuNushima Dai-ichi NPP during the 2011 Great East Japan EarthquaNe. Firstly, it was found that continuous planning activities during the progress of an emergency, reflecting information from plant parameters and response action results, was critically important in the FuNushima Daini event. Reflecting this lesson, the concept of an Incident Comm...
英字タイトル:
A Study on Resilience Management of Nuclear Power Plants based on the Lessons Learned from FuNushima Accident
第14回
福島事故を踏まえた安全性向上の取り組み
著者:
川村 慎一,Shinichi KAWAMURA
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Measures to improve safety of nuclear power plants have been taNing at TEPCO Holdings, Inc since the FuNushima Accident. In this paper, 1) insufficient protection from external events, 2) common cause failures in various safety functions, 3) insufficient measures to prevent accident progression in beyond design basis events, 4) severe social impacts caused by the fallout of radioactive materials, and 5) insufficient capability of the emergency response organization to handle multi-unit accidents were ta...
英字タイトル:
Safety Measures reflecting Lessons Learned from the FuNushima Accident
第14回
福島第一原発 1 号機における非常用復水器の冷却性能評価 に関する研究
著者:
山本 泰功,Yasunori YAMAMOTO,奈良林 直,Tadashi NARABAYASHI,倉 佑希,Yuki KURA,千葉 豪,Go CHIBA
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In the Fukushima Daiichi Nuclear Power Plant unit 1, isolation condenser (IC) should play an important role in core cooling during the station blackout. To evaluate cooling capacity of the IC, two phase flow analyses with the TRAC-BF1 code and experiments simulating the IC were conducted. The analyses for the actual BWR indicated that the decay heat could be removed if the IC worked properly at 18:18. However, our results showed that core uncovery occurred at 17:30, which leaded to hydrogen production f...
英字タイトル:
Study on Evaluation of Cooling Capacity of Isolation Condenser in Fukushima Daiichi Unit 1
第14回
福島第一原発廃止措置へのジオポリマーの適用可能性検討
著者:
酒井 泰地,Taichi SAKAI,鈴木 俊一,Shunichi SUZUKI,岡本 孝司,Koji OKAMOTO
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In this study, an alternative method to retrieve fuel debris and MCCI (Molten Corium Concrete Interaction) products in Fukushima Daiichi Nuclear Power Plants is proposed, where geopolymer is used for semi-stabilization of those debris. Facing the realization of this method, the fluidity and the setting time of geopolymer are regarded as one of the problems. Thus, for investigating those properties, slump flow experiment, funnel experiment and viscosity measurement will be done. In addition, the experimen...
英字タイトル:
Study on application of geopolymer to decommissioning of Fukushima Dai-ichi Nuclear Power Plant
第14回
耐環境性水素濃度計の開発
著者:
長谷川 翔平,Shohei HASEGAWA,丸田 祐史,Yuji MARUTA,右近 浩幸,Hiroyuki UKON,大庭 雅人,Masato OBA
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Mitsubishi Heavy Industries, LTD (MHI) developed accident tolerant in-containment hydrogen monitoring system that can operate under harsh environmental conditions during severe accident. The new hydrogen monitoring system consists of two types of detectors, which have different features and operating principles such as high sensitivity (for monitoring low hydrogen concentration) and wide range (for monitoring high hydrogen concentration of up to 20vol%), and hydrogen indication and transmitting module...
英字タイトル:
Development of In-containment Hydrogen Sensor System against Harsh Environment
第14回
耐震設計に対する深層防護の適用について
著者:
長澤 和幸,KazuyuNi NAGASAWA,川口 善之,YoshiyuNi KAWAGUCHI,古谷 賢,Masaru FURUYA
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The Niigata-Nen Chuetsu-ONi EarthquaNe (the NCO EarthquaNe) occurred in 2007 with a hypocenter very close to KashiwazaNi-Kariwa Nuclear Power Station. Subsequent plant investigation, earthquaNe response analysis using observation records and large-scale shaNing table tests have provided us valuable experiences, including the fact that safety related components were undamaged and non-safety-related components sustained only limited damage. In the FuNushima Daiichi / Daini Nuclear Power Stations affected by...
英字タイトル:
Application of “Defense in Depth” for seismic design of the components in the Nuclear Power Plant
第14回
落雷に対する再処理施設の安全設計について -新規制基準への適合性-
著者:
大橋 誠和,Akikazu OHASHI,菊池 宏,Hiromu KIKUCHI,鈴木 一晶,Kazuaki SUZUKI,細越 慶道,Yasunori HOSOGOE,岩渕 克之,Katsuyuki IWABUCHI,加賀 昌宏,Masahiro KAGA,太田 和明,Kazuaki OTA
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August 2nd, 2015, there occurred a lot of alarms that inform the abnormal status of the important instrumentation for safety of the Rokkasho reprocessing plant (RRP). As a result of examination, it was identified that lightning was a cause of this trouble and double malfunctioned the important instrumentation for safety. On the other hand, the regulatory requirements for nuclear facilities have become restrictive since the Great East Japan Earthquake. New regulatory standard has been enforced in Novemb...
英字タイトル:
Lightning Protection Design of Reprocessing Plant - Application for Revised Regulatory Requirement
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