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 WJET  Vol.3 No.3 C , October 2015
Evaluation of Uncertainties Related to the Near Field Model of Geological Repository for Spent Nuclear Fuel
Abstract: In Slovakia, a direct disposal of spent nuclear fuel in a deep geological repository within the country after a certain period of interim storage is a preferred option. This paper briefly describes near field model of radionuclide migration developed in GoldSim simulation code environment and analyses the calculated results on time-dependent release rates of safety relevant radionuclides. Given the fact that GoldSimalso enables to perform probabilistic simulations using the Monte Carlo method, a probabilistic approach was chosen to assess the influence of selected near field parameter uncertainties related to radionuclide migration on the radionuclide release rates from the bentonite buffer to the surrounding host rock. Based on the results, release rates of nuclides which exceed their solubility limits are effectively lowered and many of nuclides are significantly sorbed on the buffer material. It can be seen that the variance of the total release rate in the case of solubility uncertainty is almost two orders of magnitude within a long period of time.
Cite this paper: Barátová, D. and Nečas, V. (2015) Evaluation of Uncertainties Related to the Near Field Model of Geological Repository for Spent Nuclear Fuel. World Journal of Engineering and Technology, 3, 163-169. doi: 10.4236/wjet.2015.33C024.
References

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[2]   Nuclear and Decommissioning Company (2014) Interim Spent Fuel Storage. http://www.javys.sk/en/nuclear-facilities/interim-spent-fuel-storage/interim-spent-fuel-storage

[3]   Poinssot, C., Ferry, C., Kelm, M., et al. (2004) Spent Fuel Stability under Repository Conditions—Final Report of the European Project. European Commission, November 2001-October 2004. 104 s. CONTRACT No. FIKW-CT-2001- 00192 SFS.

[4]   Project Opalinus Clay (2002) Demonstration of Disposal Feasibility for Spent Fuel, Vitrified High-Level Waste and Long-Lived Intermediate-Level Waste (Entsorgungsnachweis). Switzerland: Nagra, 2002. Nagra Technical Report ISSN 1015-2636.

[5]   Radioactive Waste Repository Authority (1999) Reference Project of Geological Repository: Technological Part. Czech Republic: RAWRA.

[6]   GOLDSIM Technology Group LLC (2010) GoldSim Contaminant Transport Module, User`s Guide. Washington, USA.

[7]   United States Environmental Protection Agency (2015) Important Processes Affecting the Fate and Transport of Organic Compounds in the Subsurface. http://www.epa.gov/superfund/health/conmedia/gwdocs/pdfs/protoapb.pdf

[8]   Prváková, S. and Nilsson, K.F. (2006) Treatment of Data Uncertainty for the Modelling of Radionuclide Migration in Geological Repository. Office for Official Publications of the European Communities, Luxembourg, 44 p.

 
 
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