38件が見つかりました。

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第8回
放射線を“正当に怖がる”社会への課題
著者:
大場 恭子,Kyoko OBA
発刊日:
公開日:
キーワードタグ:
Huge quantities of radioactivity causes serious damages to human bodies, but small quantity is not regarded to cause dam ages to human health. However, there are people who can think of the influence of human health scientifically due to the diffusion of radioactivity exploded from the first Fukushima nuclear plants and people who cannot think so. The reaction of both people are quite different. Here, the reason of the differences are discussed from the viewpoint of knowledge....
英字タイトル:
Problems of Society that Fears Radioactivity with Scientific Justification
第8回
東海再処理施設における海中放出管からの漏えいについて -海中放出管の漏えい原因究明(その3)再発防止対策及び管理方法-
著者:
西田 恭輔,Kyosuke NISHIDA,鋤柄 光二,Kouji SUKIGARA,照沼 朋広,Tomohiro TERUNUMA,岩﨑 省悟,Shogo IWASAKI,伊波 慎一,Shinichi INAMI
発刊日:
公開日:
キーワードタグ:
1. 緒言平成21年4月に確認された東海再処理施設の海中放 出設備の漏えい事象は、漏えい箇所が海底埋設の放出 管であった。漏えいの原因は、放出管の施工時に損傷 し、経年変化として損傷箇所に電気防食で発生した水 素が影響したことで水素脆性割れが起こり、き裂が発 生、さらには水素誘起割れによりき裂が進展し貫通し たことによるものと推定した。損傷箇所に水素脆性割れが生じる原因となった水素 は電気防食によるものであり、このときの防食電位と 水素発生の関係等の調査を行った。この結果、損傷が 素が影響したことで水素脆......
英字タイトル:
Liquid leakage from the sea release pipe of the Tokai reprocessing plant estigation into the cause of the leak (3): Preventive measures against recurrences and the management metho - Investigation into the cause of the leak (3): Preventive measures against recurrences and the management method
第8回
東海再処理施設における海中放出管からの漏えいについて -海中放出設備及び漏えい事象概要-
著者:
野口 浩二,Kouzi NOGUTI,安尾 清志,Kiyoshi YASUO,瀬戸 信彦,Nobuhiko SETO,岩﨑 省悟,Shogo IWASAKI,伊波 慎一,Shinichi INAMI
発刊日:
公開日:
キーワードタグ:
At the Tokai reprocessing plant, release of the low radioactive waste liquid to the ocean is carried out using sea release facilities. It was found that there was a leak point on the sea release facilities. Therefore, surveillance and confirmation were performed and the leak point was identified. The leak part was cut and the part was then collected to investigate the cause of the leak. As a result, it was estimated that the leak oc curred after the pipe was mechanically damaged and a successive metallurg...
英字タイトル:
Liquid leakage from the sea release pipe of the Tokai reprocessing plant -Summary of ocean-releasing facilities and the leak phenomenon -
第8回
東海再処理施設における海中放出管からの漏えいについて 1 - 海中放出管漏えい箇所の復旧-
著者:
青木 賢二,Kenji AOKI,清水 和幸,Kazuyuki SHIMIZU,山本 昌彦,Masahiko YAMAMOTO,檜山 久夫,Hisao HIYAMA,岩﨑 省悟,Shogo IWASAKI
発刊日:
公開日:
キーワードタグ:
A leakage was found on the sea release pipe of the Tokai reprocessing plant The leak point was discovered in a part buried in the sea floor The damaged part was cut and was collected, and investigation into the cause was subsequently carried out As a result, external force and hydrogen embrittlement were estimated to be the cause that produced a crack on the pipe As restoration of the leak part, a construction method using a coupling technique was proposed considering steady sealability on the restore...
英字タイトル:
Liquid leakage from the sea release pipe of the Tokai reprocessing plant- Restoration of the leak point at the see release pipe --
第8回
水中レーザ溶接装置の開発
著者:
徳永 泰明,Yasuaki TOKUNAGA,千田 格,Itaru CHIDA,椎原 克典,Katsunori SHIIHARA,田村 雅貴,Masataka TAMURA,福田 健,Takeshi FUKUDA,前原 剛,Takeshi MAEHARA,依田 正樹,Masaki YODA
発刊日:
公開日:
キーワードタグ:
Toshiba has developed various laser-based maintenance and repair technologies and already applied to nuclear power plants. Laser beam welding technology has been developed as an SCC cou ntermeasure for aged components in PWRs and BWRs. This technology can also be used underwater by blowing shielding gas for creating a local dry area. This welding equipment has damage d etecting function of optical elements such as windows and optical fiber cables, and the laser beam spot position and diameter can be adjust...
英字タイトル:
Development of Underwater Laser Beam Welding Equipment
第8回
活性炭素繊維フィルターを用いた放射性ヨウ素除去用局所排風機の開発
著者:
池堂 和仁,Kazuhito IKEDOU
発刊日:
公開日:
キーワードタグ:
Boiling water type nuclear power plant(BWR) conducts overhaul of the condenser and the turbine regularly. The radioactive iodine dissipation in the tu rbine system, that occurs in the reactor during plant operation, because it may be released in the atmosphere, implement safeguards against radioactive iodine. Carbon particle filter type local air blower is conventionally used in order to eliminate the radioactive iodine before during maintenance, but has the problem in mobility due to size of the device. ...
英字タイトル:
Development of local blower for removing radioactive iodine using the carbon fiber filter.
第8回
異種材溶接継ぎ手の残留応カシミュレーション
著者:
山岸 葵,Aoi YAMAGISHI,鈴木 賢治,Kenji SUZUKI
発刊日:
公開日:
キーワードタグ:
西川 聡 Satoru NISHIKAWA Welding is widely used as a joint method of large structures. The residual stress which is the inevitable consequence of welding causes fatigue fracture or stress corrosion crackin g (SCC). In this study, the residual stresses of the dissimilar butt welding joint, which was fabricated between SUS316L and NCF600, were simulated using the finite element method. The distributions of the residual stress of the butt welding joint were anti-symmetry. The welded part had the large tensile ...
英字タイトル:
Simulation of residual stresses of dissimilar welding joint
第8回
磁束漏洩法を用いた配管減肉の定点監視に関する基礎検討
著者:
佐藤 界斗,Kaito SATO,清水 勇,Isamu SHIMIZU,菊池 弘昭,Hiroaki KIKUCHI
発刊日:
公開日:
キーワードタグ:
This paper describes an applicability of magnetic flux leakage (MFL) method for a nondestructive evaluation of wall thinning in nuclear power plants. Since MFL method has already be en applied to other industry field, this method should be an effective tool in nuclear power plants. Here, in order to investigate a possibility of MFL method for condition monitori ng of wall thinning, steels with slit were prepared and distribution of leakage magnetic flux was evaluated systematically using magnetic probe and...
英字タイトル:
A possibility of MFL method for condition monitoring of wall thinning
第8回
磁気センサを用いた高クロム鋼の非破壊劣化損傷評価
著者:
槌田 雄二,Yuji TSUCHIDA,榎園 正人,Masato ENOKIZONO
発刊日:
公開日:
キーワードタグ:
Abstract: This paper presents a non-destructive evaluation for high chrome Fe-based steels by using a magnetic sensor. In order to make clea r the fundamental magnetic properties related to tensile strain damage and fatigue damage, the magnetic measurement apparatus, which can mea sure the magnetic flux density and the magnetic field strength by B-coil and H-coil, was developed. And then the relationships between the d amages and the measured magnetic properties are shown to discuss the capability of a non...
英字タイトル:
Non-destructive evaluation for high chrome Fe-based steels by using a magnetic sensor
第8回
磁気計測を用いたサブミリサイズ欠陥の非破壊評価
著者:
清水 勇,Isamu SHIMIZU,佐藤 斗,Kaito SATO,菊池 弘昭,Hiroaki KIKUCHI,岩田 圭司,Keiji IWATA
発刊日:
公開日:
キーワードタグ:
NDE techniques using magnetic methods such as hysteresis loop, Barkhausen noise, magnetoacoustic emission, permeability changes are used for characterization of ferromagnetic steels and eva luation of degradation of steels. Also, magnetic flux leakage testing is used for wall thinning on the tubes in various plants. In this paper, a feasibility of those magnetic techniques for applying evaluation of small defects with sub-mm size was examined. As the results, the techniques except MFL method have no abilit...
英字タイトル:
NDE for defects with sub-mm size using magnetic techniques
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