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Improvement of Inventory and Leaching Rate Measurements of C-14 in Hull Waste, and Separation of Organic Compounds for Chemical Species Identification

Published online by Cambridge University Press:  30 June 2014

Ryota Takahashi ,
Michitaka Sasoh ,
Yu Yamashita ,
Hiromi Tanabe  and
Tomofumi Sakuragi
Ryota Takahashi
Affiliation:
Toshiba Corporation, 8, Shisugita-Cho, Isogo-Ku, Yokohama 235-8523, Japan
Michitaka Sasoh
Affiliation:
Toshiba Corporation, 8, Shisugita-Cho, Isogo-Ku, Yokohama 235-8523, Japan
Yu Yamashita
Affiliation:
Toshiba Corporation, 8, Shisugita-Cho, Isogo-Ku, Yokohama 235-8523, Japan
Hiromi Tanabe
Affiliation:
Radioactive Waste Management Funding and Research Center, Pacific Marks Tsukishima, 1-15-7 Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
Tomofumi Sakuragi
Affiliation:
Radioactive Waste Management Funding and Research Center, Pacific Marks Tsukishima, 1-15-7 Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
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Abstract

In order to analyze the C-14 inventory and leaching rate for safety evaluation of transuranic waste disposal, it is necessary to establish an analytical method that can measure C-14 with sufficient precision [1]. Oxidative decomposition of organic compounds containing C-14 is carried out to absorb carbon dioxide (CO2) in an alkaline solution, which is mixed with a liquid scintillation cocktail, and the amount C-14 is quantified by measuring a beta ray spectrum with a liquid scintillation counter. It has been difficult to completely decompose carbon compounds in a sample, even to CO2, by using conventional oxidizing agents. In the work described here, we improved the method of oxidative decomposition used to completely decompose carbon compounds using peroxydisulfuric acid (K2S2O8). When C-14 in the form of CO2 was absorbed in a sodium hydroxide (NaOH) aqueous solution, only 80% of the actually used quantity was detected. Total organic carbon measurements showed that the entire quantity of CO2 was absorbed by NaOH. When NaOH aqueous solution was used, it was found that only the analytical value was 80%. The entire quantity of the actually used carbon could be measured by absorbing the CO2 in Carbo-Sorb®. An anion form and a neutral molecule exist in the organic compound released from activated metals. In order to identify organic compounds efficiently, fractionation into an anion and a neutral molecule and separation by high performance liquid chromatography (HPLC) are necessary. Here, we propose the combined use of an ion exchange resin and HPLC as an improved technique for identification of the chemical species.

Keywords

Ckineticswaste management
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 139 - 148
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

Japan Atomic Energy Agency and the Federation of Electric Power Companies: Second Progress Report on Research and Development for TRU Waste Disposal in Japan, JAEA-Review 2007-010, 2007.Google Scholar
Yamaguchi, Takashi, Tanuma, Susumu, Yasutomi, Isamu, Nakayama, Tadashi, Tanabe, Hiromi, Katsurai, Kiyomichi, Kawamura, Wataru, Maeda, Kazuto, Kitao, Hideo, Saigusa, Moriyuki: A Study on Chemical Forms and Migration Behavior of Radionuclides in HULL Waste, ICEM1999, September, Nagoya, Japan, 1999.Google Scholar
RWMC, Annual Reports on Research & Development for Leaching Behavior of C-14 from Irradiated Metals, under contract with the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry, 2011.Google Scholar
RWMC, Annual Reports on Research & Development for Leaching Behavior of C-14 from Irradiated Metals, under contract with the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry, 2012.Google Scholar
Sasoh, M., The Study for The Chemical Forms of C-14 Released from Activated Metal, Proceedings of Workshop on the Release and Transport of C-14 in repository environments., NAGRA NIB04–03 (2004).Google Scholar
Miyauchi, Y., Yamashita, Y., Sakurai, J. and Sasoh, M., Nuclide release behavior from activated stainless and measurement of Kd-value, The Atomic Energy Society of Japan Autumn meeting, B23, 2011. (in Japanese)Google Scholar
Isobe, M., Yamamoto, T., Takahashi, R., Sasoh, M., Nakane, Y. and Sakai, H., Chemical Form of Organic C-14 Leaching from Irradiated Graphite in Tokai Plant, The Atomic Energy Society of Japan Autumn meeting, L28, 2008. (in Japanese)Google Scholar
Satoru, S., et al. ., A Study on the Chemical Forms and Migration Behavior of Carbon-14 Leached from the Simulated Hull Waste in the Underground condition, 2002 MRS FALL MEETING, December 2-6, Boston, MA (2002).Google Scholar
Isobe, M., Numata, K., Takahashi, R., Sasoh, M., Hirose, E. and Sakurai, J., Distribution Coeffient of C-14 released Irradiated Graphite in Tokai Plant, The Atomic Energy Society of Japan Autumn meeting, N57, 2007.Google Scholar
Tanaka, Y. and Okura, Y., eds., Bunsekikagaku I, (Nankodo, Tokyo, 1982), p. 79–81.Google Scholar
The Chemical Society of Japan, Zikkenkagakukouza Vol. 12, Kakuzikikyoumeikyushu I,(Maruzen, Tokyo, 1967).Google Scholar
Holt, R. M., Newman, M. J., Pullen, F. S., Richards, D. S. and Swanson, A. G., J. Mass Spectrom. 32, p.64 (1997).10.1002/(SICI)1096-9888(199701)32:1<64::AID-JMS450>3.0.CO;2-73.0.CO;2-7>CrossRef3.0.CO;2-7>Google Scholar
ASTM B349-93, Annual Book of ASTM Standards, Sec. 2, Volume 02, 04.Google Scholar
International Workshop on Mobile Fission and Activation Products in Nuclear Waste Disposal, L’Hermitage, La Baule, France, January 16-19, 2007.Google Scholar