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Title
Japanese: 
English:Effect of nitrogen admixture to underwater argon arc discharge plasma for nuclear decommissioning 
Author
Japanese: 赤塚洋, 中西諒, 根津篤, 森伸介.  
English: Hiroshi Akatsuka, Ryo Nakanishi, Atsushi Nezu, Shinsuke Mori.  
Language English 
Journal/Book name
Japanese: 
English:Progress in nuclear science and technology 
Volume, Number, Page Vol. 7        pp. 182-188
Published date Mar. 31, 2025 
Publisher
Japanese:日本原子力学会 
English:Atomic Energy Sosciety of Japan 
Conference name
Japanese: 
English:International Symposium on Zero-Carbon Energy Systems (IZES) 
Conference site
Japanese:東京 
English:Tokyo 
Official URL https://www.aesj.net/document/pnst007/Index.htm
 
DOI https://doi.org/10.15669/pnst.7.182
Abstract Underwater arc discharge is being studied as one of the remote dismantling processes for fuel debris retrieval at the Fukushima Daiichi Nuclear Power Plant. In this study, the effect of admixture of N2 molecules to argon arc is investigated to make the plasma with higher enthalpy. A steady-state DC arc thermal plasma is generated using a DC voltage between the anoxic copper anode and the 2%-thoriated tungsten cathode. The optical emission spectrum of the plasma plume was measured through a quartz window. The spectral analysis of Ar I lines was performed. The arc current and voltage were recorded. The total flow rate of the discharge gas was 25 L/min, where the nitrogen partial pressure ratio was adjusted in the range of 0 – 32%. It was found that the resistance of the arc plasma column increased as the nitrogen mixture ratio in the discharge gas increased. The electron temperature Te became increased up to approximately ~ 2 eV with increasing the volumetric ratio of N2 gas. On the other hand, it was found that the electron density Ne generally increases several times when nitrogen is mixed. The pH value of the irradiated water was found remarkably to decrease in the course of plasma irradiation in the open atmosphere.

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