第11回
放射線理解のための霧箱の活用(2)
著者:
辻 建二,Kenji TSUJI,中村 光廣,Mitsuhiro NAKAMURA,田原 譲,Yuzuru TARA,林 煕崇,Hirotaka HAYASHI,渡邊 剛,Tsuyoshi WATANABE
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Abstract. A scientifically correct understanding of the nature of ionizing radiation and its impact on the health has become more and more important after the accident at the Fukushima nuclear ower plant due to the Great East Japan Earthquake that occurred on March 11, 2011. We have developed the diffusion cloud chamber with the function of insertion and extraction of both a radiat ion source and a shield material independently. We demonstrated the observation of the tracks of various shape generated by al...
英字タイトル:
The Study of a Usage of Diffusion Cloud Chamber for Understanding of Ionizing Radiation (2)
第13回
核セキュリティ教育及び文化醸成の重要性
著者:
中村 陽,Yo NAKAMURA
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In the aftermath of the attacks of Sept. 11, the threat of terrorism was internationally recognized and the human resource capacity building has been underway as an urgent task. Despite the measures each country has since placed including stricter regulations, nuclear/radioactive materials related thefts and sabotage are still being observed; the threat of nuclear terrorism in international societies is only increasing. In order to respond to these still emerging threats, the reinforcement and sustena...
英字タイトル:
Importance of Education of Nuclear Security and the Fostering of its Culture
第7回
浜岡原子力発電所1、2号機廃止措置計画認可後の保全について
著者:
湖口 正裕,Masahiro KOGUCHI,中村 雅昭,Masaaki NAKAMURA,清水 義昭,Yoshiaki SHIMIZU,山本 千秋,Chiaki YAMAMOTO
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Hamaoka Nuclear Power Station got a regulatory approval for a decommissioning plan of Unit 1 & 2 on November 18, 2009. Curre ntly, system decontamination and dismantlement of facilities outside radioactive control area are under process. At the same time, we still have our maintenance program for integrity of required system functions. This paper describes an outline of a revise of maintenance program associated with approval for the decommissioning plan. ywords: decommissioning, maintenance...
英字タイトル:
Maintenance program after Approval of Decommissioning Plan of Hamaoka Unit 1 & 2
第11回
疲労健全性評価グランドデザインの構築(その 2) -国内実機疲労損傷事例分析-
著者:
中村 隆夫,Takao NAKAMURA,藤川 亮祐,Ryousuke FUJIKAWA,松下 幹弥,Mikiya MATSUSHITA,釜谷 昌幸,Masayuki KAMATA
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Abstract: After Fukushima-Daiichi NPP accident, improvement of nuclear safety is highly requested in order to prevent re-occurrence of severe accident. New sc me of fatigue evaluation to confirm system safety in NPPs is enhanced to be established based on Defense-in-Depth concept. In step 1, grand design of fatigue evaluation is reviewed on the viewpoint of fatigue management in long-term safe operation of NPPs, which is required after Fukushima-Daiichi NPP accident. Thi study focuses on the direction to r...
英字タイトル:
Reconstruction of Grand Design for Fatigue Evaluation (Step-2) -Fatigue failure analysis of Japanese NPPs-
第11回
疲労試験片表面観察に基づく 微小き裂の発生・成長に与える環境効果の影響評価
著者:
藤川 亮祐,Ryosuke FUJIKAWA,阿部 茂樹,Shigeki ABE,中村 隆夫,Takao NAKAMURA,釜谷 昌幸,Masayuki KAMAYA
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Fatigue life of nuclear facilities tends to be decreased by the influence of reactor coolant, which is called environmental effect. The effect accelerates crack growth rate but the influence for cra ck initiation is not clarified. This study intends to discuss the environmental effect in crack initiation. The crack length and the number of cracks are measured from the investigation of fatigue t est specimens in reactor coolant and air. The behavior of crack initiation is revealed from the measurement of nu...
英字タイトル:
Evaluations of environmental effect on micro crack initiation and propagation by surface observations of fatigue specimens
第5回
遠隔保守技術の大型ホットラボへの適用
著者:
坂本 直樹,Naoki SAKAMOTO,吉川 勝則,Katsunori YOSHIKAWA,櫛田 尚也,Naoya KUSHIDA,中村 保雄,Yasuo NAKAMURA,助川 清志,Kiyoshi SUKEGAWA
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Recently, the particularity of the working environment in the field of space and oceanic research lead to evelop the remote handling technology and the remote maintenance technology. Additionally, in the field f nuclear technology, such as hot laboratory, it is very important to develop the remote maintenance echnology. Espec ially, in the case of the hot laboratory to handle the irradiated fuel assembly containing he plutonium, the large scale cell equipped with shielding ability and sealing performance i...
英字タイトル:
Applying the remote maintenance technology to the Large scale hot laboratory
第10回
配管要素の組み合わせにより発生した旋回流の 配管減肉に与える影響について
著者:
山本 啓,Kei YAMAMOTO,鈴木 翔太,Shota SUZUKI,中村 隆夫,Takao NAKAMURA,米田 公俊,Kimitoshi YONEDA,渡辺 瞬,Syun WATANABE
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Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of this swirl flow is one of the major research ...
英字タイトル:
EFFECT OF SWIRL FLOW GENERATED BY THE COMBINATION OF PIPE ELEMENTS ON WALL THINNING PHENOMENA
第9回
配管要素の組み合わせにより発生する旋回流の物質移動係数評価
著者:
鈴木 翔太,Shota SUZUKI,中村 隆夫,Takao NAKAMURA,米田 公俊,Kimitoshi YONEDA
発刊日:
公開日:
キーワードタグ:
Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of this swirl flow is one of the major research tar...
英字タイトル:
Evaluation of mass transfer coefficient under swirl flowgenerated by the combination of pipe elements