176件が見つかりました。

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第17回
角運動量を保存する粒子法を用いた相変化を伴う高温・高粘性流体の 拡散・凝固挙動評価
著者:
横山 諒,鈴木 俊一,岡本 孝司,（東京大）,近藤 雅裕,（産総研）
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For predicting the fuel debris distribution in Fukushima Daiichi Nuclear Power Plants (1FNPPs), it is essential to figure out the melt spreading behavior on primary containment vessel (PCV) floor. In this paper, we analyzed VULCANO spreading experiment programs using a particle method called “Moving Particle Full-Implicit method (MPFI)” which conserves an angular momentum. Phase change model was installed into MPFI method. two experiments having different corium characteristics were analyzed to confirm the ...
英字タイトル:
Evaluation of spreading-solidification behavior of high-temperature and highly viscous fluid by particle method with angular momentum conservation
第17回
設計想定を超える事象に対する構造強度分野からの新しいアプローチ
著者:
笠原 直人,出町 和之,佐藤 拓哉,一宮 正和,（東京大）,若井 隆純,山野 秀将,（JAEA）,中村 いずみ,（防災科研,現都市大）
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The conventional purpose in the field of structural strength has been to prevent damage to design basis events (DBE). For beyond design basis events (BDBE), it is necessary to mitigate the impact on safety on the premise that damage will occur. The authors propose a mitigation method that suppresses the consequence into a fracture mode with a large impact by reducing the load due to a fracture with a small impact on safety. We will introduce the research results for individual component, extend the applicab...
英字タイトル:
New approach to beyond design basis events in structural strength field
第17回
赤外線サーモグラフィによる設備診断適用事例 （下水処理設備の長寿命化）
著者:
山田 浩文,山越 孝太郎,（サーモグラファー）
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The introduction of mechanical condition monitoring technology is progressing in domestic nuclear power plants. However, the equipment of nuclear power plants is highly sound, and it is difficult to detect characteristic nonconformities and confirm the effects by condition monitoring. Here, we would like to introduce examples of introduction of condition monitoring technology at domestic sewerage facility treatment plants and pumping stations, and refer to characteristic nonconformities and required effects...
英字タイトル:
Application example of equipment diagnosis by infrared thermography (Extend the life of sewage treatment plants)
第17回
超音波診断技術（音響）を利用した次世代型保全
著者:
加藤 剛,小鯛 詠史,李 曙嬰,（東北エンタープライズ）
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・超音波による設備診断技術 ・原子力発電所における導入事例と導入結果 ・機械状態監視保全における超音波診断技術（音響）を利用した、軸受診断におけるオンラインでの モニタリングと給脂作業の融合についてご提案いたします。...
英字タイトル:
Next-generation maintenance using ultrasound diagnostic technology(acoustics)
第17回
逆止弁診断へのAI適用の検討
著者:
礒部 仁博,松永 嵩,小川 良太,（原燃工）
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As an attempt to apply AI in the field of maintenance, we have been developing a diagnosis method of check valves to detect the internal leakage and the signal before the leakage based on the signal analysis of their vibration measurements by a portable system with AE (Acoustic Emission) sensors. CNN (Convolutional Neural Network) was applied to the measured raw waveform and its frequency distribution corresponding to the leakage rates in order to classify the leakage rates. The leakage rate was gradually i...
英字タイトル:
Study on the Application of AI to Check Valve Diagnosis
第17回
連続運転可能な大流量微小差圧吸気型火山灰除去装置の開発
著者:
伊藤 康隆,田口 優,伊藤 健太郎,今村 瑞,砂川 雅志,（北海道電力）,高木 祐,長澤 裕之,（HKテクノロジー）,伊藤 克美,庄子 哲雄,（東北大）
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At nuclear power plants, measures are required for emergency power supply equipment under the condition that high-concentration volcanic ash will continue to fall on the order of several g / m3 for 24 hours. A pre-filter is installed as the main countermeasure, but a lot of manpower is required in anticipation of clogging. Therefore, it is desired to develop a device with a capability to stably remove a large amount of high-concentration volcanic ash from intake air for a long period. In this work, a volcan...
英字タイトル:
Development of large flow rate micro differential pressure intake type volcanic ash removal device capable of continuous operation
第17回
遮蔽ケースを利用した高放射線量下における温度ロガーの活用方法
著者:
宮田 篤,平尾 秀男,（NEL）
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高放射線環境下に設置されるボタン型温度計について、金属で遮蔽することによってどれほど放射線の影響を減らすことが出来るのか調査した。結果、厚さ 25mm のタングステン製のケースに入れることよって、ケースを用いない場合に比べ 90%以上の放射線が遮蔽され、計測される温度の異常値も大幅に減らすことができた。...
第17回
配管減肉による配管損傷確率の評価手法の検討
著者:
森田 良,（電中研）
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For the quantitative evaluation of importance of maintenance and management to the piping in the turbine system and the feedwater system, an evaluation method of the piping failure frequency due to wall thinning, one of the major aging phenomena in the secondary and BOP systems, were developed. Based on the uncertainty of the thinning rate, initial thickness and material strength, frequency of the piping failure was evaluated probabilistically. As a trial evaluation, the difference of the failure frequency ...
英字タイトル:
Development of evaluation method of pipe failure frequency due to wall thinning
第17回
配管減肉計測向け非接触超音波センサの実機模擬配管における 適用性確認
著者:
田村 明紀,遠藤 正男,（日立製作所）,沖田 俊介,大城戸 忍,（日立GE）,Chenguhuan Zhong,（Inductosense Ltd）,Anthony J. Croxford,Paul D. Wilcox,（Bristol大）
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A pipe-wall thinning measurement is required to ensure integrity of a piping system in a power plant. Aiming to reduce the inspection time of the pipe-wall thinning measurement, we have been developing an innovative measurement technology which enables the pipe-wall thinning inspection without removing the insulation, based on the non-contact ultrasonic sensor. To confirm applicability of this sensor to the pipe-wall thinning inspection in actual plants, we performed the thickness measurement tests by using...
英字タイトル:
Applicability confirmation of the non-contact ultrasonic sensor by the pipe simulating actual plant conditions
第17回
重大事故（SA）等対処設備の運転中保全の考え方と課題
著者:
石橋 文彦,西 優弥,峰村 武宏,（東芝ESS）
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It is important to improve both plant safety and plant operability simultaneously in nuclear power plants (NPPs). “On-Line Maintenance (OLM)” is one of solutions for this issue. This paper proposes “Application rules of OLMs for systems & components against Severe Accidents” based on IRIDM (Integrated Risk Informed Decision Making). In this proposal, implementation of OLMs should be decided by CDF (Core Damage Frequency) and CFF (Containment Failure Frequency) under system configuration during OLM, and comp...
英字タイトル:
Application rules and future tasks of On-Line Maintenance for systems & components against Severe Accidents
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