第14回
研究開発段階発電用原子炉の特徴を考慮した保守管理の提案 (4)ナトリウム弁の事例
著者:
近澤 佳隆,Yoshitaka CHIKAZAWA,髙屋 茂,Shigeru TAKAYA,田川 明広,Akihiro TAGAWA,久保 重信,Shigenobu KUBO
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A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage were first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. In this paper, maintenance program for sodium valves are investigated. ...
英字タイトル:
Proposal of Maintenance Management of Nuclear Power Plants at R&D Stage by Taking Account of Their Features (4) case study on sodium valves
第3回
磁気的手法による SUS304 鋼の高温疲労初期損傷評価
著者:
高屋 茂,Shigeru TAKAYA,永江 勇二,Yuji NAGAE
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We investigated the relationship between magnetic properties and the accumulation of fatigue damage at elevated temperature for SUS304 stainless steel. The strain-controlled push-pull fatigue tests at 923 K under total str ain range conditions of 0.4%, 0.5% and 0.7% were implemented. The leakage magnetic flux density was also measured before and after each fatigue test. As result, it was shown that the maximum differences in leakage magnetic flux density before and after the fatigue test subsequently incre...
英字タイトル:
Evaluation of Initial Fatigue Damage of SUS304 Stainless Steel at Elevated Temperature by a Magnetic Method
論文
磁気的手法による応力腐食割れの初期劣化評価
著者:
高屋 茂,Shigeru TAKAYA,鈴木 隆之,Takayuki SUZUKI,松本 善博,Yoshihiro MATSUMOTO,出町 和之,Kazuyuki DEMACHI,上坂 充,Mitsuru UESAKA
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Two magnetic methods are proposed for the evaluation of initial degradations of type 304 stainless steel in stress corrosion cracking (SCC). The first one is the measurement of the distribution of chromium depletion by means of a magnetic force microscope (MEM). MEM observations are performed for some samples sensitized in various conditions, and the obtained results coincide with the expected ones from the chromium behavior. Moreover, the phase distributions in the solution-annealed and sensitized states a...
英字タイトル:
Evaluation of Initial Degradation in Stress Corrosion Cracking by Magnetic Methods
第10回
耐熱磁気センサの開発
著者:
髙屋 茂,Shigeru TAKAYA,荒川 尚,Hisashi ARAKAWA,欅田 理,Satoshi KEYAKIDA
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A heat-resistant flux gate magnetic sensor has been developed. Permendur, which has high Curie point, is employed as the magnetic core material and the detection method of the external magnetic field is modified. The characteristics of the developed magnetic sensor up to 500 oC were evaluated. The sensor output increased linearly with the external magnetic field in the range of ±5 G and the standard deviation at 500 oC was about 0.85G. ...
英字タイトル:
Development of Heat-resistant Magnetic Sensor
第2回
長時間クリープ損傷を受けるオーステナイト系ステンレス鋼の磁気変化
著者:
永江 勇二,Yuji NAGAE,高屋 茂,Shigeru TAKAYA,青砥 紀身,Kazumi AOTO
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To realize long-life fast breeder reactor (FBR) plants, it is important to develop a precise estimation method of metallurgical microstruct ure change before crack initiation. For estimating the metallurgical microstructure change related to degradation in commercial FBR plants, the change of magnetic property is focused on. Austenitic stainless steel is paramagnetic, but the magnetic flux density changes as creep damage at 773K or 823K. Finally, it is possible to detect the metallurgical microstructure c...
英字タイトル:
Magnetic change in austenitic stainless steels subjected to long term creep damage
論文
高温磁気センサの開発
著者:
髙屋 茂,Shigeru TAKAYA,荒川 尚,Hisashi ARAKAWA,欅田 理,Satoshi KEYAKIDA
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A magnetic sensor which can be applied to measurement at elevated temperature was newly developed. It is a kind of flux gate magnetic sensor. Permendur was employed for a magnetic core instead of Permalloy which is commonly used because Permendur has much higher Curie point, about 1000oC. Heat resistant ceramic coating Cu wires were used for coils. External magnetic field is detected by shift of peak position of differential permeability during induction of triangular excitation current. A magnetic co...
英字タイトル:
Development of High Temperature Magnetic Sensor
第12回
高速炉機器の信頼性評価に関するガイドラインの整備
著者:
髙屋 茂,Shigeru TAKAYA,町田 秀夫,Hideo MACHIDA,神島 吉郎,Yoshio KAMISHIMA
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This paper describes the outline of the guidelines on structural reliability evaluation for the passive components of the fast breeder reactor (FBR). The guidelines are now being prepared by the working group for the system based code in the Japan society of mechanical engineers. They consist of five chapters, which are “General rules”, “Reliability evaluation”, “Failure scenario setting”, “Modeling”, and “Failure probability calculation”, respectively. In the chapter of “Reliability evaluation”, the g...
英字タイトル:
Development of Guidelines for Structural Reliability Evaluation for FBR
第11回
高速炉機器の構造信頼性評価法のベンチマーク評価
著者:
髙屋 茂,Shigeru TAKAYA,浅山 泰,Tai ASAYAMA,町田 秀夫,Hideo MACHIDA,神島 吉郎,Yoshio KAMISHIMA
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Abstract This paper describes a procedure of structural reliability evaluation of passive components of fast breeder reactors for a failure due fatigue-creep interaction damage, and also reports results of benchmark evaluation conducted by using two independently developed codes. The s tructural integrity of a reactor vessel was evaluated deterministically and probabilistically. The results estimated by two codes agree well for oth of deterministic and probabilistic evaluations, which shows that these cod...
英字タイトル:
Benchmark Evaluation of Structural Reliability Evaluation Codes for FBR
論文
高速炉用 9Cr フェライト系耐熱鋼における溶接 HAZ 部の組織解析
著者:
岩田 満直,Mitsunao IWATA,杉山 雄一,Yuichi SUGIYAMA,村田 純教,Yoshinori MURATA,高屋 茂,Shigeru TAKAYA
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State of microstructure in metallic materials can be expressed as numerical values based on a concept of system free energy, and the energy value is used as a measure of damage analysis of the materials. In this study, change in the system free energy of the FG-HAZ in 9Cr heat resistant ferritic steels during creep is evaluated as summation of chemical free energy, strain energy and surface energy, which are obtained by a series of experiments, i.e., chemical analysis using extracted residues, X-ray d...
英字タイトル:
Microstructural analysis of HAZ in the welded joints of 9Cr heat resistant ferritic steels for fast reactor
第8回
高速炉用 9Cr フェライト系耐熱鋼における溶接 HAZ 部の組織解析
著者:
岩田 満直,Mitsunao IWATA,杉山 雄一,Yuichi SUGIYAMA,村田 純教,Yoshinori MURATA,高屋 茂,Shigeru TAKAYA
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Microstructural states of metallic materials can be expressed by system free energy, and the estimation of the system free energy is useful for damage analysis of the materials. In this study, chang e with creep time in the system free energy of the FG-HAZ in 9Cr heat resistant ferritic steels is estimated on the basis of a series of experiments such as chemical analysis by using extracted resid ues, X-ray diffraction, and scanning transmission observations. The change in the system free energy is expresse...
英字タイトル:
Microstructural analysis of HAZ in the welded joints of 9Cr heat resistantferritic steels for fast reactor