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第12回
基礎ボルトの減肉検査技術開発（その２）
著者:
熊野 秀樹,Hideki YUYA,山﨑 直,Tadashi YAMASAKI,加古 晃弘,Akihiro KAKO,城下 悟,Satoru SHIROSHITA
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Anchor bolts have been used to fix components in nuclear power plant to concrete structure. Bolt thinning is supposed to occur under long term operation of nuclear power plant in corrosive environments and requires a development of nondestructive inspection method. We have begun some internal researches since 2009 and developed a unique PA-UT method using delayed echoes. Additional works were conducted recently to show its performance such as a detectable maximum defect length and depth, which are rep...
英字タイトル:
Development of inspection method for thinned bolts by PA-UT (2)
第12回
多核種除去設備ALPS 吸着塔におけるすきま腐食に及ぼす 銀添着活性炭の影響評価
著者:
真栄田 義一,Yoshikazu MAEDA,阿部 博志,Hiroshi ABE,渡邉 豊,Yutaka WATANABE
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Abstract: Crevice corrosion was occurred at the adsorption tower with silver impregnated carbon of Advanced Liquid Processing System (ALPS). The influence of silver impregnated activated carbon on crevice corrosion of 316L stainless steel was investigated by corrosion test and electrochemical measurement. Crevice corrosion was observed on the specimen tested with the activated carbon. On the other hand, no corrosion was observed on that without the activated carbon in both pH7.4 and pH12 solution (art...
英字タイトル:
Influence of activated carbon on crevice corrosion in adsorption tower of Advanced Liquid Processing System (ALPS)
第12回
多点分析手法による回転機器構造系異常の検出
著者:
角皆 学,Manabu TSUNOKAI,萱田 良,Ryo KAYATA,高瀬 健太郎,Kentaro TAKASE
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This work investigates the effective method for detecting structural abnormality such as misalignment or unbalance in rotating machines. Experiments are performed which acquire vibration acceleration data of a horizontal pump under various structural abnormality. In order to detect abnormality comparing to the normal state, feature vector is defined as a set of magnitude of rotational frequency and its harmonics of vibration signal, then change of it is evaluated with SBM (Similarity Based Modeling). W...
英字タイトル:
Study of the capability of detection of structural abnormality in rotating machines with multipoint analysis
第12回
女川原子力発電所における防潮堤かさ上げ工事について
著者:
熊田 広幸,Hiroyuki KUMATA,尾崎 充弘,Mitsuhiro OZAKI
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At Onagawa Nuclear Power Plant, a 17m-high tsunami-wall was constructed by April in 2012 as one of emergency safety measures, which had been planned right after the accident of Fukushima Dai-ichi Nuclear Power Plant caused by the 3.11 disaster in 2011. After that, we re-evaluated the tsunami based on the latest scientific knowledge obtained from the 3.11 earthquake. We came to know that the maximum tsunami run-up height could be 23.1m above sea level, and that tsunami would exceed existing 17m-high tsu...
英字タイトル:
The Raising of a Tsunami-wall at Onagawa Nuclear Power Plant
第12回
女川原子力発電所２号機 原子炉建屋耐震壁他改良工事の施工
著者:
飛田 喜央,Yoshihisa TOBITA ,堀江 仁,Hitoshi HORIE ,櫻井 一雄,Kazuo SAKURAI
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Inspection results and building simulation analyses after the Tohoku Earthquake of March 2011 show that Unit 2 reactor building in the Onagawa Nuclear Power Station was secure enough during the earthquake. However, the data also indicate that the seismic response of the operating floor (top floor of the building) is relatively high compared to that of other stories because operating floors have fewer earthquake-proof members so that they can secure large space; therefore, we conducted seismic retrofit...
英字タイトル:
Improving Construction of Earthquake-Resistant Walls and Others in Unit 2 Reactor Building of Onagawa Nuclear Power Station
第12回
密閉容器内の放射線分解による水素発生
著者:
和田 陽一,Yoichi WADA,可児 祐子,Yuko KANI,太田 信之,Nobuyui OTA,上野 学,Manabu UENO,佐々木 麻由,Mayu SASAKI
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Hydrogen evolution by radiolysis of water in a sealed vessel has been studied with Co-60 gamma source to develop evaluation method for hydrogen evolution amount to transfer and store radioactive materials. Experiments were carried out by changing ratio of gas phase volume to liquid phase volume to consider effects on hydrogen production amount from pure water at room temperature. Obtained results were (1) G-value became smaller and equilibrium pressure increased when ratio of gas phase volume to liquid...
英字タイトル:
Radiolytic Hydrogen Evolution in Sealed Vessel
第12回
廃ＥＨＣ制御油の処理に関する研究
著者:
池堂 和仁,Kazuhito IKEDOU,春日 智子,Tomoko KASUGA
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When an EHC turbine oil used in a nuclear power plant was burned in a furnace, a phosphorus-containing compound with a low-melting temperature formed to clog a ceramic filter for removing an effluent gas. In the present work the compound in the oil was converted into chemically stable phosphates via reaction with calcium hydrate at room temperature. The resulting calcium phosphates could be removed as a fly ash after heating at high temperature. ...
英字タイトル:
Study on the treatment of EHC-used oil
第12回
志賀原子力発電所における状態監視保全の取り組み状況
著者:
新屋 和彦,Kazuhiko ARAYA,森本 英光,Hidemitsu MORIMOTO,座主 正貴,Masaki ZASU,根上 司,Tsukasa NEGAMI
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In the Nuclear Power Station, maintenance of many equipment are performed by time-based maintenance which overhaul the equipment at the reactor outages intervals. However, there is a tendency that has become an excessive maintenance such as inspection interval is short in time-based maintenance, on the contrary there is a risk that shorten the life of the equipment is concerned. Therefore, it is promoting the introduction of condition-based maintenance to implement maintenance at the appropriate timin...
英字タイトル:
Efforts of condition based maintenance in Shika Nuclear Power Station
第12回
我国の原子力発電所の運転期間40 年制限に関する 規制上の課題と提言
著者:
青木 孝行,Takayuki AOKI,竹内 公人,Kimihito TAKEUCHI,伊藤 邦雄,Kunio ITO,富田 洋一郎,Yoichiro TOMITA,高木 敏行,Toshiyuki TAKAGI
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The nuclear reactor regulation law was amended three years ago (2012). In this amendment, the operation period of the commercial nuclear power plants in Japan was limited to 40 years. This limit may produce various problems in plant life management. So this paper proposes several recommendations for improvement. ...
英字タイトル:
Recommendations related to the Problem of Limiting the Life of Japanese Nuclear Plants to 40 Years
第12回
日本機械学会維持規格評価章改訂状況の紹介
著者:
北条 公伸,Kiminobu HOJO
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This paper introduces a recent activity for revision from 2008 ed. of JSME Rules for Fitness for Service, mainly Evaluation chapter. The main revision points are 1) Introduction of the flaw acceptance rule of Class 1 components into Class 2 and 3 piping, 2) Introduction and arrangement of new K-solution equations, and 3) Development of a new code case for a flaw acceptance rule and K-calculation guideline for J-grooved weld of a bottom mounted instrument nozzle for cap-repair. These revisions and devel...
英字タイトル:
Recent activity for revision of JSME Rules on Fitness for Service (Evaluation chapter)
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