Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
山本 智彦; 加藤 篤志; 早川 雅人; 下山 一仁; 荒 邦章; 畠山 望*; 山内 和*; 江田 優平*; 由井 正弘*
Proceedings of 2023 International Congress on Advanced in Nuclear Power Plants (ICAPP 2023) (Internet), 6 Pages, 2023/04
In the secondary cooling system of sodium-cooled fast reactor (SFR), a rapid detection of hydrogen explosion due to sodium-water reaction by water leakage from heat exchanger tube is steam generator (SG) is important in terms of safety and property protection. For the hydrogen detection, Ni-membrane hydrogen detectors using atomic transmission phenomenon were used in Japanese proto-type sodium-cooled fast reactor "Monju". However, during the plant operation, many alarms of water leakage were occurred without sodium-water reaction in relation to temperature up and down. The authors focus on the difference in composition of hydrogen and the difference between the background hydrogen under normal operation and the hydrogen generated by the sodium-water reaction and theoretically estimate the hydrogen behavior in liquid sodium by using ultra-accelerated quantum chemical molecular dynamics (UA-QCMD). As the results of theoretical estimation, dissolved H or NaH, rather than H, is the predominant form of the background hydrogen in liquid sodium, and hydrogen produced in large amounts by sodium-water reaction can exist stably as fine bubbles with a NaH layer on their surface. Currently, the authors study the new hydrogen detector system focusing on the difference between the background hydrogen (dissolved H) and the hydrogen by sodium-water reaction (fine bubbles H
). This paper describes the comparison between the theoretical estimation and experimental results based on hydrogen form in sodium.
深堀 智生; 千葉 敏; 高田 弘; 中原 康明; 渡辺 幸信*
日本原子力学会誌, 37(4), p.264 - 273, 1995/00
被引用回数:0 パーセンタイル:0.00(Nuclear Science & Technology)近年要求が高まっている評価済中高エネルギー核データに関して、その研究の進展について総合的に解説した。特に、評価の基礎となる中高エネルギー核反応理論及びモデルのうち、前平衡モデル、核内カスケードモデル、量子論的分子動力学法、光学ポテンシャル、高エネルギー核分裂反応に関する研究の進展について概説した。また、これらを利用した種々の計算コードの開発が進められているがこれについて、その問題点、OECD/NEA及びシグマ委員会において行われたベンチマークテストの結果及び評価済高エネルギー核データファイルの現状、ハドロン輸送現象の進展について簡単に解説した。