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第14回
パンケーキコイルを用いた高性能アレイ ECT 技術の開発
著者:
難波 一成,Kazushige NAMBA,長谷部 貴士,Takashi HASEBE,神納 健太郎,Kentaro JINNO,黒川 政秋,Masaaki KUROKAWA
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1.緒言 現在,原子炉補機冷却水系統などの一次系関連系統設備における各種熱交換器(以下,補機と称す)では,チューブに対しボビンプローブを用いた ECT[1]が実施されている。検査手法をさらに高度化(例として,ボビンプローブでは原理的に困難である周方向欠陥の検出性向上)しつつ, 必要十分の機能を実装することを目的として,熱交換器向けにパンケーキコイルを用いて独自に工夫したコイル 配置にすることで、比較的低コストで良好な検出性を持つアレイECTプローブを開発した。 本論文では,アレイECTプローブの基幹技術で......
英字タイトル:
Development of high performance array ECT technique by using pancake coils
第14回
プラント DiD リスクモニタの多用途応用の展望
著者:
吉川 榮和,Hidekazu YOSHIKAWA,中川 隆志,Takashi NAKAGAWA,寺下 尚孝,Naotaka TERASHITA,馬 戦国,Zhanguo MA
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A new risN monitor system has been under development which can be applied not only to prevent severe accident in daily operation but also to serve to mitigate radiological hazard just after severe accident happens. The system is composed by plant DiD (Defence-in Depth) risN monitor and reliability monitor. The plant DiD risN monitor can describe versatile scenarios of human-machine interaction in accident situation by utilizing UML (Unified Modeling Language) so as to serve as a useful tool of accident m...
英字タイトル:
A prospective review on multi-purpose application of plant DiD risN monitor
第14回
ボルト簡易診断法の開発研究
著者:
松井 計雄,Kazuo MATSUI,藤吉 宏彰,Hiroaki FUJIYOSHI,小川 良太,Ryouta OGAWA,礒部 仁博,Yoshihiro ISOBE
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We have developed a simple diagnosis method using an AE (Acoustic Emission) sensor applicable to chemical anchors in nuclear power plants. With purpose of its application to the field, waveform database to identify improper installation or ageing was constructed. We also confirmed applicability of the diagnosis method to other types of anchor (e.g. anchor bolts, mechanical anchors). Details of development chronology are described in this paper. . ...
英字タイトル:
Developing a simplified diagnosis method for anchor bolts
第14回
マイクロ波を用いた配管広域一括探傷技術のエルボ付配管への適用性評価 Evaluation of the Applicability of a Nondestructive Testing Method using Microwaves to the Long-range Inspection of a Pipe with a Bend
著者:
佐々木 幸太,Kota SASAKI,片桐 拓也,Takuya KATAGIRI,遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME
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This study evaluates the applicability of a nondestructive testing method using microwaves to the long-range inspection of a pipe with a bend. Experimental verifications were performed using four 1 m pipes, with an inner diameter of 23 mm, connected with flanges and a 90-degree bend. The experimental verifications confirmed clear reflections due to artificial wall thinning, simulated by a short pipe with an inner diameter larger than 23 mm, even when the wall thinning was situated directly below the ben...
第14回
マイクロ波を用いた配管広域一括検査技術の開発
著者:
橋爪 秀利,Hidetoshi HASHIZUME,遊佐 訓孝,NoritaNa YUSA,佐々木 幸太,Kota SASAKI,片桐 拓也,TaNuya KATAGIRI
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This paper introduces the recent progress in the development of a microwave nondestructive testing method, aiming at the rapid and long-range inspection of a pipe, in the authors’ group. ...
英字タイトル:
Development of a nondestructive testing method using microwaves to the rapid inspection of pipes
第14回
マルチコプタの屋内飛行システムに関する一提案
著者:
三輪 昌史,Masafumi MIWA,佐々木 隆志,Takashi SASAKI,松井 隆,Takashi MATSUI
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Recently, Unmanned Aerial Vehicle is used in many purpose such as wall inspection and disaster relief. When UAV flies indoor field, GPS can’t be used because radio waves from the satellites do not reach. Therefore, other positioning systems are necessary for indoor autonomous flight. Also detecting and avoiding obstacle system is necessary. In this study, we report the result of obstacle detecting / avoiding system using LIDARs. Also we present an indoor flight system including obstacle detecting and avo...
英字タイトル:
An Automatic Navigation System for Multi-copter
第14回
マーカーによるドローンの屋内自律飛行
著者:
佐々木 隆志,Takashi SASAKI,松井 隆,Takashi MATSUI
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Abstract: In this paper, we show an implementation of AR-marker based flight routing system with smartphone-grade visible light camera and low-cost microcontroller board. It not depend on any other special equipment such as depth sensor and visual recongition and can continue to trace markers autonomously. This system is intended to be used as supplemental navigation method in the situation than other sophisticates locating method such as 3D-SLAM cannot be used in acctident or restriction....
英字タイトル:
Autonomous indoor navigation for drones with AR marker
第14回
リスクを活用した合理的な圧力容器保全のための研究
著者:
中筋 俊樹,Toshiki NAKASUJI,阮 小勇,Xiaoyong RUAN,森下 和功,Kazunori MORISHITA
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Reactor pressure vessel (RPV) steels are subjected to neutron irradiation that can lead to loss of fracture toughness. One of the critical issues for RPV structural integrity is related to the pressurized thermal shock (PTS) event. Risk assessment is important for safety evaluation and maintenance planning of a nuclear power plant. In this study, a new method was developed to assess a failure risk of RPV at PTS event for the risk-based maintenance. The failure risk was caused by fluctuations of stress...
英字タイトル:
Risk-based Optimization of Reactor Pressure Vessel Maintenance
第14回
レジリエンス評価法の高速炉への適用性に関する基礎的検討
著者:
鈴木 正昭,Masaaki SUZUKI,出町 和之,Kazuyuki DEMACHI,高屋 茂,Shigeru TAKAYA,近澤 佳隆,Yoshitaka CHIKAZAWA
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We have proposed new indices for evaluating resilience, that is, the response margin and response reliability of a nuclear power plant during an accident and detailed procedure for assessing those indices. In this study, the resilience of a simple fast reactor plant model is evaluated according to the indices. The applicability of the resilience evaluation method to fast reactor plants is then discussed from the viewpoints of reflecting the characteristics of each reactor type....
英字タイトル:
Fundamental Study on Applicability of Resilience Evaluation Method to Fast Reactor Plants
第14回
レーザーガウジング除染工法に関する実用化研究成果
著者:
本田 翔也,Shoya HONDA,橋川 雄樹,Yuki HASHIKAWA
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商用炉の保守・改造及び廃止措置時に発生する放射性廃棄物の物量低減のため、放射性廃棄物のクリア ランスレベル(除染により汚染レベルを低減させ、取扱いを容易にする)を目的とし、ラインレーザを 用いたガウジング除染工法の開発を進めている。ここでは、本除染工法に関する除去能力評価試験及び 模擬汚染を用いた除染性能評価試験(Cold 試験)の成果について報告する。
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英字タイトル:
The Result of Practical Use-Research about a Laser-Gouging Decontamination Method
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