| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-09-19 |
| タイトル |
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タイトル |
Study on acceptable air concentration limit in helium gas inside the Test Cell in Fusion Neutron Source A-FNS |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Kenjo Shunsuke
Honda Shogo
Hideya Nakanishi
Saerom Kwon
Oyaizu Makoto
Ochiai Kentaro
Sato Satoshi
Masuda Kai
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Fusion Neutron Source A-FNS, which accelerates a deuteron beam on a liquid lithium (Li) target, aims to acquire material properties under neutron irradiation—essential for the realization of the JApan’s DEMOnstration fusion reactor. Neutron irradiation is performed in a Test Cell (TC) surrounded by thick concrete shielding. Since the atmospheric condition inside the TC consists of helium gas at negative pressure, some air in-leakage into the TC is inevitable. In this study, we evaluated acceptable air concentrations in helium gas within the TC and air in-leak rates to prevent Li ignition and atmospheric activation. Based on our recent R&D activity, we established an air concentration limit in helium gas as 5 vol.% to prevent Li ignition in the event of a Li leak. Air activation calculations using the FISPACT code reveal that the tritium production amount (2.8 × 106 Bq/h) is the main contribution to the tritium inventory in the TC. This tritium is primarily produced via the 14N (n,t) reactions. The air in-leak rates were determined by modeling the helium purification process and developing start-up procedures for the liquid Li target system and TC. Based on these findings, we proposed the design requirements for the TC, interlock (Machine Protection System), and detritiation system in the circulating helium purifier. |
| 書誌情報 |
Fusion Engineering and Design
号 222,
p. 115445,
発行日 2025-09
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| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.fusengdes.2025.115445 |
