The metallic elements with a low melting point and high vapor pressure seemed to transfer in aerosols selectively at dismantling reactor internals using heat cutting. Therefore, the arc melting tests of neutron irradiated zirconium alloy were conducted to investigate the radionuclide transfer behavior of aerosols generated during the heat cutting of activated metals. The arc melting test was conducted using a tungsten inert gas welding machine in an inert gas or air atmosphere. The radioactive aerosols were collected by filter and charcoal filter. The test sample was obtained from Zry-2 fuel cladding irradiated in a Japanese boiling water reactor for five fuel cycles. The activity analysis, chemical composition measurement and scanning electron microscope observation of aerosols were carried out. Some radionuclides were enriched in the aerosols generated in an inert gas atmosphere and the radionuclide transfer ratio did not change remarkably by the presence of air. The transfer ratio of Sb-125 was almost the same as that of Co-60. It was expected that Sb-125 was enriched from other elements since Sb is an element with a low melting point and high vapor pressure compared with the base metal (Zr). In the viewpoint of the environmental impact assessment, it became clear that the influence if Sb-125 is comparable to Co-60. The transfer ratio of Mn-54 was one order higher compared with other radionuclides. The results were discussed on the basis of thermal properties and oxide formation energy of the metallic elements.
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The 11th International Conference on Environmental Remediation and Radioactive Waste Management
September 2–6, 2007
Bruges, Belgium
Conference Sponsors:
- Nuclear Division and Environmental Engineering Division
ISBN:
978-0-7918-4339-0
PROCEEDINGS PAPER
Study for Radionuclide Transfer Ratio of Aerosols Generated During Heat Cutting
Yukihiro Iguchi,
Yukihiro Iguchi
Japan Nuclear Energy Safety Organization, Tokyo, Japan
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Tsutomu Baba,
Tsutomu Baba
Japan Nuclear Energy Safety Organization, Tokyo, Japan
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Hiroto Kawakami,
Hiroto Kawakami
Japan Nuclear Energy Safety Organization, Tokyo, Japan
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Takashi Kitahara,
Takashi Kitahara
Hitachi, Ltd., Ibaraki, Japan
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Atsushi Watanabe,
Atsushi Watanabe
Hitachi, Ltd., Ibaraki, Japan
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Mitsuhiro Kodama
Mitsuhiro Kodama
Nippon Nuclear Fuel Development Company, Ltd., Ibaraki, Japan
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Yukihiro Iguchi
Japan Nuclear Energy Safety Organization, Tokyo, Japan
Tsutomu Baba
Japan Nuclear Energy Safety Organization, Tokyo, Japan
Hiroto Kawakami
Japan Nuclear Energy Safety Organization, Tokyo, Japan
Takashi Kitahara
Hitachi, Ltd., Ibaraki, Japan
Atsushi Watanabe
Hitachi, Ltd., Ibaraki, Japan
Mitsuhiro Kodama
Nippon Nuclear Fuel Development Company, Ltd., Ibaraki, Japan
Paper No:
ICEM2007-7139, pp. 1095-1101; 7 pages
Published Online:
May 29, 2009
Citation
Iguchi, Y, Baba, T, Kawakami, H, Kitahara, T, Watanabe, A, & Kodama, M. "Study for Radionuclide Transfer Ratio of Aerosols Generated During Heat Cutting." Proceedings of the The 11th International Conference on Environmental Remediation and Radioactive Waste Management. 11th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B. Bruges, Belgium. September 2–6, 2007. pp. 1095-1101. ASME. https://doi.org/10.1115/ICEM2007-7139
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