Nuclear Facilities of Serbia

Belgrade, Serbia

Nuclear Facilities of Serbia

Belgrade, Serbia
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Miljevic N.,Jaroslav Cerni Institute for the Development of Water Resources | Pesic A.,Jaroslav Cerni Institute for the Development of Water Resources | Golobocanin D.,Vinča Institute of Nuclear Sciences | Grsic Z.,Nuclear Facilities of Serbia | And 2 more authors.
Central European Geology | Year: 2010

Daily precipitation was collected in the period from May to December 2010, along with the corresponding meteorological data (air temperature, humidity, amount of precipitation) in the Vinca Institute of Nuclear Sciences (44°45′33″ ″N, 20°35′57″ ″E), Belgrade, Serbia. On the basis of backward trajectory analysis, three dominant trajectory categories are determined: southwestern Europe (SW), northeastern Europe (NE), and northwestern Europe (NW), which were associated with 49 (71%) of the events. The highest daily δ 18O and δ 2H values were measured on 9 December (-1.3 and-8.7, respectively), whereas the lowest values were measured on 28 December (-143.2% and-19.3%, respectively). Circulation back trajectories, synoptic-scale surface and middle-tropospheric weather maps, and δ 2H and δ 2O values for 69 precipitation samples, were examined to determine the origin and direction of the air masses for each event.

Plecas I.,Vinča Institute of Nuclear Sciences | Pesic R.,Nuclear Facilities of Serbia
World Academy of Science, Engineering and Technology | Year: 2011

The leaching rate of 137Cs from spent mix bead (anion and cation) exchange resins in a cement-bentonite matrix has been studied. Transport phenomena involved in the leaching of a radioactive material from a cement-bentonite matrix are investigated using three methods based on theoretical equations. These are: the diffusion equation for a plane source an equation for diffusion coupled to a firstorder equation and an empirical method employing a polynomial equation. The results presented in this paper are from a 25-year mortar and concrete testing project that will influence the design choices for radioactive waste packaging for a future Serbian radioactive waste disposal center.

Grsic Z.,Nuclear Facilities of Serbia | Dramlic D.,University of Belgrade | Milutinovic P.,University of Belgrade | Pavlovic S.,Nuclear Facilities of Serbia | And 5 more authors.
Journal of Environmental Protection and Ecology | Year: 2014

In this study, we point to loss of accuracy in representing a field of air pollution concentration due to reduction of number of monitoring points or changes in their location. Using a Gaussian-type diffusion model, a high resolution concentration field was generated from 17 points representing the actual distribution of possible pollution sources. The starting grid consisted of 90 601 points. Then we reduced number of points by two orders of magnitude, forming the grid of 961 points. After that, the second reduction to 36 points was performed, still forming a regular grid. Finally, we had 16 points whose positions are in a qualitative agreement with the actual distribution of sampling stations in the area.

Plecas I.,Vinča Institute of Nuclear Sciences | Dimovic S.,Vinča Institute of Nuclear Sciences | Pesic R.,Nuclear Facilities of Serbia
Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM | Year: 2011

Traditional methods of processing evaporator concentrates from Nuclear Power Plants are evaporation and cementation. These methods allow transforming a liquid radioactive waste into a more inert form, suitable for a final disposal. To assess the safety for disposal of radioactive mortar-waste composition, the leaching of 137Cs from immobilized radioactive evaporator concentrate into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA. Curing conditions and curing time prior to commencing the leaching test are critically important in leach studies since the extent of hydration of the cement materials determines how much hydration product develops and whether it is available to block the pore network, thereby reducing leaching. Incremental leaching rates Rn (cm/d) of 137Cs from evaporator concentrates after 1825 days were measured. The results presented in this paper are examples of results obtained in a 30-year concrete testing project which will influence the design of the engineer trenches system for future central Serbian radioactive waste storing center Copyright © 2011 by ASME.

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