著者
高須賀 晋
出版者
日本建築学会
雑誌
建築雑誌 (ISSN:00038555)
巻号頁・発行日
no.1183, pp.71-72, 1981-08
著者
石原 只雄
出版者
社団法人溶接学会
雑誌
溶接学会誌 (ISSN:00214787)
巻号頁・発行日
vol.57, no.1, pp.21-28, 1988-01-05
被引用文献数
1
著者
小村 浩夫
出版者
技術と人間
雑誌
技術と人間 (ISSN:02855186)
巻号頁・発行日
vol.20, no.10, pp.p49-57, 1991-10
著者
上広 勝信 饒 燕飛 福田 研二
出版者
九州大学
雑誌
九州大学大学院総合理工学研究科報告 (ISSN:03881717)
巻号頁・発行日
vol.17, no.2, pp.245-252, 1995

An analytical model is proposed to study regional instabilities in parallel boiling channels with the voidreactivity feedback. The model takes into consideration the effect of interaction between channels with different void fraction change by modeling the diffusion of neutrons. Linear stability analysis in the frequency domain is performed to investigate dominant factors of unstable oscillation mode. In the case of 2 channels, two stability boundaries are found to exist on the stability map, one for the in-phase and the other for the out-of-phase mode instabilities respectively. It is found that the interaction between channels affects the out-of-phase mode instability. For a certain range of the void-reactivity coefficient, the void-reactivity feedback loop is found to be unstable in a certain region on the stability map, which has an effect on the stability of the in-phase mode stability.
著者
鈴木 俊一 福田 俊彦 山下 裕宣
出版者
一般社団法人日本エネルギー学会
雑誌
日本エネルギー学会誌 (ISSN:09168753)
巻号頁・発行日
vol.83, no.7, pp.480-484, 2004-07-20

L-grade stainless steels as 316NG, SUS316L and SUS304L have been used for the BWR reactor internals and re-circulation pipes as SCC resistant materials. However, SCC of the L-grade material components were reported recently in many Japanese BWR plants. The detail investigation of the components showed the fabrication process such as welding, machining and surface finishing strongly affected SCC occurrence. In this paper, research results of SCC of L-grade stainless steels, metallurgical investigation of core shrouds and re-circulation pipings, and features of SCC morphology were introduced. Besides, the structural integrity of components with SCC, countermeasures for SCC and future R&D planning were introduced.