第17回
Integrating deep learning-based object detection and optical character recognition for automatic extraction of link information from piping and instrumentation diagrams
著者:
董 飛艶,陳 実,出町 和之,(東京大),橋立 竜太,高屋 茂,(JAEA)
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Piping and Instrumentation Diagrams (P&IDs) contain information about the piping and process equipment together with the instrumentation and control devices, which is essential to the design and management of Nuclear Power Plants (NPPs). There are abundant complex objects on P&IDs, with imbalanced distribution of these objects and their linked information across different diagrams. The complexity of P&IDs thus is increased which make automatic identification difficult. Therefore, the content of P&IDs is gen...
第15回
JRR-4の廃止措置計画の概要及び実施状況について
著者:
石黒 裕大,根本 勉,山田 佑典,大山 光樹,(JAEA)
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After operating until December 2010, JRR-4 was under periodical self-inspection for the next operation. After that, it suffered from the Great East Japan Earthquake on March 11, 2011. But it recovered almost a year later. However, we determined to decommission JRR-4 in September 2013. After that, we received the approval of the decommissioning plan of JRR-4 on June 7, 2017. And we received the approval of the change of the safety regulations related to it. Subsequently JRR-4 was shifted to decommission phas...
英字タイトル:
Outline and implementation status of decommissioning plan of JRR-4
第16回
ふげんにおける廃止措置中の原子炉施設の保全について
著者:
林 健太,伊藤 健司,松尾 秀彦,酒井 康裕,(JAEA)
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Advanced Thermal Reactor FUGEN had accumulated about 25 years of operation results and permanently shut down in March 2003. Currently, FUGEN has entered into the second phase of decommissioning (Reactor Periphery Facilities Dismantling Period). Regarding to the maintenance, facilities related to the safe storage of spent fuel have been reliably inspected in accordance with the inspection plan, while we have been rationalizing maintenance continuously. In this paper, we report on the rationalization measures...
英字タイトル:
Maintenance of reactor facilities under Decommissioning in FUGEN
第16回
システム化規格概念に基づく新型炉の規格開発
著者:
浅山 泰,(JAEA)
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This paper presents a future vision for safety and structural code development for advanced non-light water reactors. The most important feature that these codes and standards should have is that they ensure that safety goals are met in the way most appropriate and practical to the characters of new reactors which could be significantly different from those of light water ones. For this purpose, the author proposes a “universal structure” which consists of goals, codes and standards and knowledge base. The ...
英字タイトル:
Code Development for Advanced Non-LWRs Based on the System Based Code Concept
第15回
ナトリウム中ルースパーツ回収装置の試作及び基礎試験
著者:
上田 雅司,石黒 貴寛,(JAEA),服部 終始,服部 司,(服部鉄工),白浜卓馬,(NESI)
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Sodium-cooled fast reactors need special maintenance technologies such as remote maintenance, under sodium viewer etc., because sodium is opaque, chemically active and the maintenance works must be performed in high temperature. To acquire basic knowledge for remote maintenance technology in liquid sodium, a trial product of recover device for loose parts was fabricated and tested in sodium. The positions of loose parts were approximately estimated by using ultrasound, and the parts were recovered by the de...
英字タイトル:
Trial fabrication and basic test of a recovery device for loose parts in liquid sodium
第17回
ナトリウム機器ステンレス鋼溶接部の欠陥数密度評価
著者:
豊田 晃大,橋立 竜太,矢田 浩基,高屋 茂,宮越 博幸,加藤 章一,(JAEA)
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Probabilistic fracture mechanics (PFM) evaluation requires information on the probabilistic distributions of the number and size of initial defects, material properties such as crack growth rate due to fatigue and creep, and load to evaluate the failure probability of components. In this study, ultrasonic testing was conducted on the welds of the test equipment used in the research and development of fast reactors, and the number and size of defects were evaluated. The results could be used as conservative ...
英字タイトル:
Evaluation of Defect Number Density in Sodium Equipment Stainless Steel Welds
第17回
ホットセル負圧制御用空気圧縮機の更新による運転保守管理の改善
著者:
磯﨑 涼佑,坂本 直樹,(JAEA)
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核燃料物質使用施設のホットセル負圧制御用として使用している空気圧縮機について、高経年化により機能低下の兆候が見られたので更新した。更新機種は、運転情報を電子データに記録できるものを選定し、 これらデータを活用した運転保守管理の改善を図った。...
第17回
リスク情報を活用した保全の合理化に向けた定量的なリスク評価の 必要性を判定する簡易スクリーニング手法の提案
著者:
橋立 竜太,矢田 浩基,高屋 茂,二神 敏,山野 秀将,栗坂 健一,江沼 康弘,(JAEA)
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If components can be maintained according to a target reliability of nuclear power plants, plant safety and economic efficiency could be improved by avoiding excessive or insufficient margins. This approach can rationalize the maintenance of low target reliability components and concentrate resources (people, money, and time) on the maintenance of high target reliability components. It would take a long time to evaluate the target reliability for all components in the plant by quantitatively using probabili...
英字タイトル:
Proposal of a Simple Screening Method Which Determines Necessity of Quantitative Risk Assessment for Maintenance Rationalization Using Risk Information
第16回
レーザー誘起超音波による構造物の健全性評価
著者:
山田 知典,(JAEA),大道 博行,(レーザー技術総研),柴田 卓弥,西村 昭彦,田川 明広,(JAEA)
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For decommissioning of the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings, Incorporated, we are now developing remote laser diagnostic techniques for integrity evaluation of support structures. Ultrasonic waves were induced on a sample by an impact laser. The waves propagating through the sample were detected with a laser Doppler vibrometer using a measuring laser. This technology enables remote, non-contact diagnosis....
英字タイトル:
Characteristics of structures using laser diagnostic techniques
第15回
二重露光法による粗大粒材の応力測定
著者:
鈴木 賢治,(新潟大),菖蒲 敬久,(JAEA),城 鮎美,(量子科学機構)
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As a new X-ray stress measurement method for coarse grain material, the double exposure method (DEM) is proposed, and its analysis is explained in this paper. A diffraction angle can be obtained from an incident and a spotty diffracted beams. Each X-ray beam is measured by an area detector on a linear motion stage on the 2 θ-arm in the DEM. To examine the validity of the DEM, the residual stress of the plastically bent specimen was measured. In addition, the residual stress distribution of the indentation s...
英字タイトル:
Stress Measurement of Coarse Grains Using Double Exposure Method