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The analysis of the probabilistic scenario "Pumping well"
Abstract. The diffusion transfer of long-lived radionuclides in engineered barriers of an underground spent fuel and radioactive waste disposal facility has been studied. Two schemes of barriers have been considered: the constant thickness of the excavation disturbed zone of a rock mass and the constant thickness of the near-field zone. Concrete and bentonite are considered as materials to be used in engineered barriers' construction. The choice of nuclides, the parameters for their migration in the studied media, the time period of investigation and the underground facility parameters has been substantiated for consideration. The scenario of normal evolution is taken as a scenario of evolution of an underground radiation-hazardous materials disposal facility. According to this scenario, diffusion is considered to be the transfer mechanism dominating in the near-field zone of the facility. Using the PORFLOW code, an algorithm of numerical solution of a diffusion equation have been chosen as an mathematical apparatus of the models proposed, taking the mechanism of radioactive decay into account. As a result, the spatial distributions of radionuclide concentrations through the thickness of the barrier system as well as the migrating isotopes' concentration dynamics in the near-zone of the underground facility have been calculated. The results analysis has enabled, firstly, to estimate the maximum radionuclide concentration in the conjugate zone between the "excavation disturbed zone" and "host geological formation", and, secondly, to show "in digits" the decrease in the radionuclide concentration due to the concrete and bentonite thickness.
Printed reference: Amosov P.V. The analysis of the probabilistic scenario "Pumping well" // Vestnik of MSTU. 2007. V. 10, No 4. P. -.
Electronic reference: Amosov P.V. The analysis of the probabilistic scenario "Pumping well" // Vestnik of MSTU. 2007. V. 10, No 4. P. -. URL: http://vestnik.mstu.edu.ru/v10_4_n29/articles/02_amos.pdf.
