127件が見つかりました。

並び替え
第14回
超音波エコー法を用いた転がり軸受の異常診断
著者:
若林 利明,ToshiaNi WAKABAYASHI
発刊日:
公開日:
キーワードタグ:
Failures of machines having rotating parts are mostly caused by damage to bearings and conventional diagnostic methods have found difficulties in performing the early detection of such damage, so that more advanced diagnosis is necessary. This study therefore applies an ultrasonic technique to bearing life tests. The experimental results of ultrasonic wave pulse (UWP) echoes have demonstrated that the time intervals between peaNs of UWP echoes varied in accordance with the movement of rolling balls. The...
英字タイトル:
Abnormality Diagnosis of Rolling Bearings by Ultrasonic Technique
第14回
超音波フェーズドアレイ法による 一方向凝固材検査技術の開発
著者:
溝田 裕久,Hirohisa MIZOTA,永島 良昭,Yoshiaki NAGASHIMA,中畑 和之,Kazuyuki NAKAHATA
発刊日:
公開日:
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An ultrasonic measurement method has been developed to determine the crystal growth angle of a unidirectional solidification material by using an ultrasonic array probe. The crystal growth direction of a unidirectional solidified nickel based superalloy are derived within an error of ±5 degrees by evaluating wave height levels of echoes measured with focal laws of each assumed crystal growth angle. Moreover, high precision ultrasonic testing is realized based on the focal laws considering the acoustic anis...
英字タイトル:
Development of Ultrasonic Phased Array Testing Method for Unidirectional Solidification Materials
第14回
軽水炉安全ロードマップの高度活用
著者:
滝沢 真之,Masayuki TAKIZAWA
発刊日:
公開日:
キーワードタグ:
A roadmap on safety research and human resource cultivation for Light-Water Reactor (LWR) has been developed by a lot of stakeholders, that is experts of government, academia and industry in the committee of Atomic Energy Society of Japan since 2014. In the roadmap, technical, social and policy issues are covered and the issues are categorized into several research fields, e.g. _Design”, _Operation and Maintenance”, _Accident Management”, _Decommissioning”, _Nuclear Security” and so on. A lot of stakeho...
英字タイトル:
Trial for Advanced Application of LWR Safety Roadmap
第14回
運転中の大容量共用施設における計測制御設備の更新工事
著者:
橋本 渉,Wataru HASHIMOTO,加賀 康文,Yasufumi KAGA,紺野 准也,Junya KONNO,草野 昌紀,Masanori KUSANO,岸本 裕樹,Hiroki KISHIMOTO
発刊日:
公開日:
キーワードタグ:
At the case of the replacement of instrumentation and/or control system for the common and large capacity facilities such as a compressed service air supply system, it is very important to proceed this work in short period and without any influence to the operation of many number of this users. In order to realize this fundamental requirement, enough consideration, evaluation ,and countermeasures to the risk by FMEA have been executed since planning stage. By means of these activities, a stable operation...
英字タイトル:
Achievement of the replacement of the instrumentation and control system during continuous operation of the common and large capacity facilities
第14回
過酷事故時の水位計の指示誤差の回復操作と精度維持に関する研究
著者:
倉 佑希,Yuki KURA,奈良林 直,Tadashi NARABAYASHI,山本 泰功,Yasunori YAMAMOTO,千葉 豪,Go CHIBA
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公開日:
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The water level in the fuel zone is an important parameter to conduct properly accident management. In the Fukushima Daiichi Nuclear Power Plant accident, measurement error of the water level occurred, which was caused by evaporation of water in a reference leg. To measure the water level properly, the reference leg connected to the condensing chamber must be filled with water. We focused on the method called backfill to keep the performance of water level gauge during severe accident. Backfill is applied ...
英字タイトル:
Study on keeping performance of water level gauge under the severe accident.
第14回
過酷事故時の溶融デブリによるコンクリートの熱劣化に関する研究
著者:
晴山 隆仁,Takahito HAREYAMA,奈良林 直,Tadashi NARABAYASHI,山本 泰功,Yasunori YAMAMOTO,千葉 豪,Go CHIBA,林 司,Tsukasa HAYASHI,今野 隆博,Takahiro KONNO
発刊日:
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In the Fukushima daiichi accident, molten core supposed to be leaked from the pressure vessel to the concreate floor in the containment vessel. To keep the integrity of the containment, development of small type of core catcher which can be installed in present nuclear power plant is needed. In this investigation, the thermal deterioration of concreate and Magnesia-Carbon brick was evaluated by the surface observation and the measurements of compressive strength, weight reduction, and difference of void r...
英字タイトル:
Investigation on thermal deterioration of concreate in severe accident
第14回
配管減肉検査における非接触超音波センサの 適用性に関する基礎的検討
著者:
田村 明紀,Akinori TAMURA,河野 尚幸,Naoyuki KONO,大城戸 忍,Shinobu OKIDO,Chenghuan ZHONG,Erik FABRE,AnthonyJ. CROXFORD,D. WILCOX
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A pipe-wall thinning measurement is one of key inspections to ensure the integrity of the piping system in power plants. Since the pipes of the power plants are covered with insulation, the removal of the insulation, which is time-consuming process in general, is required for the pipe-wall thinning inspection. We have been developing an innovative measurement technology, which enable the pipe-wall thinning inspection without removing the insulation, based on the non-contact ultrasonic sensor proposed by ...
英字タイトル:
Feasibility study of non-contact ultrasonic sensor for pipe-wall thinning inspection of power plants
第14回
重大事故模擬環境下における 原子力発電所用安全系ケーブルの絶縁性能
著者:
皆川 武史,Takefumi MINAKAWA,池田 雅昭,Masaaki IKEDA,平井 直志,Naoshi HIRAI,大木 義路,Yoshimichi OHKI
発刊日:
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To examine electrical insulation behavior of cables under severe accident environments, safety-related low voltage cables used as “severe accident management equipment” were subjected to the test at 155 oC, which simulated highest assumed temperature when proper accident management measures are taken. In addition, insulation resistance was measured for the cables during steam exposure in the test. As a result, all the cables passed the acceptance criteria of voltage withstand test prescribed in the JNES...
英字タイトル:
Insulation Performance of Safety-related Cables for Nuclear Power Plants under Simulated Severe Accident Conditions
第14回
関西電力における原子力発電所の安全性向上対策について
著者:
西田 泰信,Yasunobu NISHIDA,爾見 豊,Yutaka SHIKAMI,高木 俊弥,Toshiya TAKAKI,上山 逸平,Ippei UEYAMA,中島 由香里,Yukari NAKAJIMA
発刊日:
公開日:
After the Fukushima-daiichi accident, the KANSI Electric Power has implemented various safety measures against severe accident for nuclear power plants. In this paper, we will explain about overview of measures and internal flooding caused by the high energy line break. The high energy line break may cause common mode failure which damages the multiplexed and diversified protection system at the same time by a single piping break. Therefore we have to take all possible measures for the prevention from int...
英字タイトル:
Safety measures for severe accident on the KANSAI nuclear power plants
第14回
電動機のウェーブワッシャ不良による深溝玉軸受の早期損傷メカニズムと振動診断
著者:
佐々木 一人,Ichito SASAKI,瀬川 佑太,Yuta SEGAWA
発刊日:
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キーワードタグ:
Maintenance methods are broadly grouped to the preventive maintenance(Time Based Maintenance) and the post incident maintenance(Condition-Based-Maintenance,Breakdown-Maintenance). It is unusually confirmed after maintenance that an unsuitable disassembling of rotating equipment causes incident such as increasing of vibration or abnormal sound. At the case of maintenance of electrical motors that are used for mid or small sized pumps or blowers, and wave-washer is reused, a few times of these phenomena ...
英字タイトル:
Early damage mechanism and vibration diagnosis for ball bearing of electric motor caused by unsuitable function of wave washer.