111件が見つかりました。

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第11回
福島事故の教訓と運転プラントのシステム安全?
著者:
宮野 廣,Hiroshi MIYANO,関村 直人,Naoto SEKIMURA,出町 和之,Kazuyuki DEMACHI,荒井 滋喜,Shigeki ARAI,松本 昌昭,Masaaki MATSUMOTO
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キーワードタグ:
Particularly, Since the on Fukushima the system Dai-ichi safety assessment accident, the of importance plants in operation, of “system the safety” various has degradation been recognized. aspects with transiti on of time ha been emphasized. Accordingly, functional degradation will be the assessment target, reliability and assessment the changes will in the be made safety on codes the consolidation and the concept of of important safety will functions be dealt under with; a where, system, the not on individ...
英字タイトル:
Lessons & Learns from Fukushima Daiichi Accident and New Concept of System Safety on Nuclear Power Plants
第11回
竜巻飛来物速度評価法の課題とその解決策
著者:
江口 譲,Yuzuru EGUCHI,杉本 聡一郎,Soichiro SUGIMOTO,服部 康男,Yasuo HATTORI,平口 博丸,Hiromaru HIRAKUCHI
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Abstract: Large variation was found among the design values of tornado missile speed shown in current stan dards and guides in Japan and U.S. It was also found that the design missile speed indicated in the Guide issued by the Nuclear Regulation Authority of Japan is the most restrictive among them. The primary reason is due to the evaluation method where all the objects are unconditionally assumed to be placed in air as gh as 40 m, even if the object should be on the ground. In order to solve this problem...
英字タイトル:
Problems and proposed solution in evaluating tornado-borne missile speed
第11回
膜圧式疲労試験による等二軸応力下での微小疲労き裂進展評価
著者:
飯田 智,Satoshi IIDA,阿部 茂樹,Shigeki ABE,中村 隆夫,Takao NAKAMURA,釜谷 昌幸,Masayuki KAMAYA
発刊日:
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1.はじめに 現在、原子力発電所においては経年劣化による設備の 機能喪失を防ぐため保全活動が行われている。プラント 機器の保全において疲労の累積を予測し損傷の防止を図 ることは事故防止につながる重要な活動である。疲労累 積評価は単軸試験で得たデータを基にして作成された設 計疲労曲線を用いて行われている。設計疲労曲線による 評価はもともと機器の設計に用いる目的で作られている ため、運転中の機器の実際の疲労累積状態や余寿命の評 価が難しいという課題がある。 そこで、実機の疲労累積状態を仮想的なき裂の長さに 置......
英字タイトル:
Evaluation of Micro Fatigue Crack Growth under Equi-biaxial Stress by Membranous Pressure Fatigue Test
第11回
規格基準は事業者と規制をつなぐ技術者と行政のルール
著者:
奈良林 直,Tadashi NARABAYASHI
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キーワードタグ:
Abstract: The 2011 off the Pacific coast of Tohoku Pacific Earthquake and the Tsunami gave the serious damage to the Fukushima-Daiichi Nuclear Power Plants (NPPs). The accidents occurred in Unit 1, 2, 3 and 4. It is said that the height of tsunami attacked Fukushima NPP was more than 14m. After 50 minutes from the automatic shut-down, tsunami attacked the NPPs in Fukushima Daiichi NPPs. For example, the Unit 1 lost A/C power caused the loss of water injection function; it made the core meltdown and unu...
英字タイトル:
Standers and Guidelines should be Rules between Licensees and Regularly
第11回
負圧環境下で正確に作動する差圧式圧力スイッチの開発
著者:
森本 憲次,Kenji MORIMOTO,安尾 清志,Kiyoshi YASUO,瀬戸 信彦,Nobuhiko SETO,綿引 誠一,Seiichi WATAHIKI
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Negative atmospheric pressure is an isolation technique used in nuclear facilities including vessels and hot-cells to prevent release of radioactive materials. In the related system, differential pressure switches are very important function for process monitoring such as liquid level and negative pressure in a reprocessing process. Although air-tight switches have been using to avoid radioactive contamination, such type of switch have not meet requirements for precise operation under deep negative pre...
英字タイトル:
Development of a differential pressure switch for precise operation under negative pressure
第11回
超音波探傷訓練へのシミュレーション解析技術の適用
著者:
古川 敬,Takashi FURUKAWA,水野 亮二,Ryoji MIZUNO,上山 芳教,Yoshinori KAMIYAMA
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As one of plans to improve a skill of UT inspector, a methodo utilize ultrasonic waves predicted by UT simulation is su ggested. Therefore, modeling methods of metal microstructurebased on solidification simulation and the actual flaw dete ction conditions were developed, and UT simulation is carried out using the models. The validity in the simulation model is verified compared with experimental results. A method to apply simulation results to UT skill training is suggested....
英字タイトル:
Application of FEM simulation for UT skill training
第11回
超高純度ステンレス鋼SUS310EHP の部材製作技術開発
著者:
岡田 聖貴,Kiyotaka OKADA,杉山 裕志,Hiroshi SUGIYAMA,蝦名 哲成,Tetsunari EBINA,加納 洋一,Yoichi KANO,中山 準平,Junpei NAKAYAMA,曽我 幸弘,Yukihiro SOGA
発刊日:
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The Extra High Purity Stainless Steel “SUS310EHP” has been developed to use in high oxidizing environments of the reprocessing plant. This stainless steel has higher intergranular-corrosion-resistance than R-SUS304ULC that is used in Rokkasho Reprocessing Plant. The SUS310EHP fabrication technology was verified by making sheets, plates and tubes. Moreover, the weldability of this stainless Steel was also investigated using the sheets, plates and tubes. ...
英字タイトル:
Development of Fabrication Technology of the Extra High Purity Stainless
第11回
軽水炉リーク燃料の取替え保全最適化のためのモデル
著者:
森下 和功,Kazunori MORISHITA,科 山本,山本 泰功,Yasunori YAMAMOTO,科 中筋,中筋 俊樹,Toshiki NAKASUJI
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Fuel cladding is one of the key components in a fission reactor to keep confining radioactive materials inside a fuel tube. During reactor operation, the cladding is however sometimes breached and radioactive materials leak from the fuel ceramic pellet into the coolant water through the breach. The primary coolant water is therefore monitored so that any leak is quickly detected, where the coolant water is periodically sampled and the concentration of, for example the radioactive iodine 131 (I-131), is...
英字タイトル:
Monte Carlo Modeling for Realizing Optimized Management of Failed Fuel Replacement
第11回
逆止弁診断技術開発
著者:
松永 嵩,Takashi MATSUNAGA,江藤 淳二,Junji ETOH,稲川 聡,Satoshi INAGAWA,礒部 仁博,Yoshihiro ISOBE
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We have developed Check Valve Inspection System using acoustic emission sensor and ultrasonic sensor, to examine degradation and detailed motion (Full open, Tapping, Oscillation, etc.) of the swing check valve. This inspection system was applied check valves in the seawater system line of domestic nuclear power plants. The examination was carried out before and after replacing the check valve. Comparing the results of the inspection system and the results of overhaul, effectiveness of this system has b...
英字タイトル:
Development of check valve inspection technique
第11回
重イオン照射した Fe-Cr 合金の磁気ヒステリシス特性の 照射温度及び Cr 濃度依存性
著者:
兜森 達彦,Tatsuhiko KABUTOMORI,鎌田 康寛,Yasuhiro KAMADA,小林 悟,Satoru KOBAYASHI,三谷 誠司,Seiji MITANI,渡辺 英雄,Hideo WATANABE
発刊日:
公開日:
キーワードタグ:
Magnetic properties of heavy ion irradiated single crystalline Fe Cr films were investigated High quality Fe 20%Cr 001 films with a thickness of 30 nm were prepared by electron beam deposition and irradiated by 2 4MeV Cu2+ ions at various temperatures and magnetization curves were measured using a VSM Micro fabricated films and Fe Cr film with Cr concentration gradient 0% 13% were also prepared and magnetic domain struct ures were observed using a Kerr microscope The coercivity of Fe 20%Cr increased by ...
英字タイトル:
The irradiation temperature and Chromium concentration dependence of the magnetic properties of heavy-ion irradiated Iron-Chromium alloys
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