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TTo comply with increasingly strict regulations for protection against radiation exposure, many nuclear power plants have been working ceaselessly to reduce and control both the radiation sources within power plants and the radiation exposure experienced by operational and maintenance personnel. Many research studies have shown that deposits of irradiated corrosion products on the surfaces of coolant systems are the main cause of occupational radiation exposure in nuclear power plant. These corrosion product deposits on the fuel-clad surface are also known to be main factors in the onset of axial offset anomaly (AOA). Hence, there is a great deal of ongoing research on water chermistry and corrosion processes. In this study, a magnetic filter with permanent magnets was devised to remove the corrosion products in the coolant stream by taking advantage of the magnetic properties of the corrosion products demonstrated a removal efficiency of over 90% for particles above 5${\mu}m$. This finding led to the construction of an electromagnetic device that causes the metallic particulates to flocculate into larger aggregates of about 5${\mu}m$ in diameter by using a novel application of electromagnetic flocculation on radioactive corrosion products.

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참고문헌 (9)

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  2. Song, M. C. A Study on the Method and Process for Removal of Radioactive Corrosion Product from NPP using its Magnetic Property, Ph. D thesis. Korea Advanced Institute of Science and Technology, pp. 72-74, (2004) 
  3. Song, M. C., Kim, S. I., and Lee, K. J. 'Development of a magnetic filter system using permanent magnets for separating radioactive corrosion products from nuclear power plants' , Journal of Separation Science and Technology, Vol. 39, Issue 5, pp. 1039-1059, (2004) 
  4. Reitz, J. R., Foundations of Electromagnetic Theory, 4th edition. Addison Wesley Longman, (1993) 
  5. Kim, S. I. A Study on the Moving Alternative Magnetic Filter for Radioactive CRUD Removal, MS thesis. Korea Advanced Institute of Science and Technology, pp. 11-14, (2001) 
  6. Nakajima, H., Kaneko, H., Oizumi, M., Fukui, S., Yamaguchi, M., Sato, T., Oizumi, M., Imaizumi, H., Nishijima, S., and Watanabe, T. 'Separation characteristics of open gradient magnetic separation using high-temperature superconducting magnet', Journal of Physica C: Superconductivity, Vol. 392-396, Part 2, pp. 1214-1218, October (2003) 
  7. Selvaggi, J. A., Cottrell, D. L., Falconer, T. H., Daugherty, M. A., Daney, D. E., Hill, D. D., and Prenger, F. C. 'High gradient magnetic separation using a high temperature superconducting magnet', Journal of Applied Superconductivity, Vol. 6, Issue 1, pp. 31-36, January (1998) 
  8. Furlani, E. P. Permanent Magnet and Electromechanical Devices. New York: Academic Press, p. 329, (2001) 
  9. Song, M. C., Kong, T. Y., and Lee, K. J. 'Conceptual Design of the Filter using Electromagnet and Permanent Magnets for Removal of Radioactive Corrosion Products,'Journal of the Korean Radioactive Waste Society, Vol.1 [1], pp. 73-79, December (2003) 

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