Estimation of Tritium Concentration in the Environment based upon Global Tritium Cycling Model

글로벌 삼중수소 순환 모델을 이용한 삼중수소 환경 방사능 추정

  • Published : 2003.03.30

Abstract

The periodic safety review of operational nuclear power plants requires that the plants should keep a well organized environmental monitoring program. The past records of environment monitoring data were analyzed. and the tritium concentrations of the samples in the surface and ground water around Kori site were measured. It was shown that the tritium concentrations around the Kori site were slightly higher than that of natural background. The change of background tritium concentration was estimated through a numerical modeling. Two different versions of 7 compartments model - the world and the northern hemisphere - defined in NCRP-62 were modeled for the global tritium cycling. The numerical solution of the model was obtained using a computer program, AMBER. The four cases of tritium source-terms into the atmosphere were considered. The results showed that the tritium concentration in the surface soil water was higher than that in sea water or surface stream water. Also, it was shown that the tritium produced by the interaction between cosmic rays and the gases were the major source of tritium, and the tritium produced by nuclear weapon test decreased considerably.

References

  1. US EPA, Environmental Analysis of the Uranium Fuel Cycle, Part III, Nuclear Fuel Reprocessing, EPA-520/9-73-003-D, U. S. Environmental Protection Agency, Office of Radiation Programs, Washington, DC (October 1973)
  2. J. E. Till, H. R. Meyer, E. 1. Etnier, E. S. Bomar, R. D. Gentry, G. G. Killough, P S. Rohwer, V. I. Tennery, and C. C. Travis., Tritium- An Analysis of Key Environmental and Dosimetric Questions, ORNL/TM-6990 (1980)
  3. Enviros QuantiSci, AMBER 4.0 Reference Guide, Enviros QuantiSci, Oxfordshire, UK (1998)
  4. M. W. Carter and A. A. Moghissi, ‘Three decades of nuclear testing,’ Health Pliys., 33, 55 - 71 (1977)
  5. H. Bonka, ‘Production and emission of tritium from nuclear facilities, and the resulting problems, in: Symposium on the Behaviour of Tritium in the Environment,’ 105 - 121, IAEA (1979)
  6. R. Bergman, U. Bergstroem, and S. Evans, ‘Environmental transport and long-term exposure for tritium released in the biosphere,’ in: Symposium on the Behaviour of Tritium in the Environment, 535 - 554, lAEA (1979)
  7. National Council on Radiation Protection and Measurements, Tritium in the Environment, NCRP Report No. 62 (1979)
  8. 한국전력공사, 원자력발전소 방사선관리 연보, 146 - 151 (1999)
  9. S. Okada and N. Momoshima, ‘Overview of tritium: characteristics, sources, and problems,’ Health Phys., 85, 597 - 609 (1993)
  10. A.J. P. Brundenell, C. D. Collins, and G. Shaw, 'Dynamics of tritiated water (HTO) uptake and loss by crops after short-term atmospheric release,' J Environ Radioactivity, 36, 197 - 218 (1997) https://doi.org/10.1016/S0265-931X(96)00088-4
  11. 한국원자력안전기술원 원자력시설 주변 환경 조사 및 평가보고서, KINS/AR-735 (1999)
  12. R. Nishimura, S. Morisawa, and Y. Shimada, ‘Evaluation of the Japanese health risks induced by global fallout tritium,’ Health Phys. 65, 628 - 647 (1993)
  13. C. Easterly and Jacobs, D. G., ‘Tritium release strategy for a global system,’ in: Proceedings of an International Corference on Radiation Effects and Tritium Technology for Fusion Reactors, Vol.III, CONF-750989 (1975)