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.
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ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management
September 25–29, 2011
Reims, France
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-5498-3
PROCEEDINGS PAPER
Curing Time Effect on the Fraction of 137Cs From Immobilized Radioactive Evaporator Sludge by Portland Cement
Ilija Plecas,
Ilija Plecas
Vinca Institute of Nuclear Sciences, Belgrade, Serbia
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Slavko Dimovic,
Slavko Dimovic
Vinca Institute of Nuclear Sciences, Belgrade, Serbia
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Radojica Pesic
Radojica Pesic
Nuclear Facilities of Serbia, Belgrade, Serbia
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Ilija Plecas
Vinca Institute of Nuclear Sciences, Belgrade, Serbia
Slavko Dimovic
Vinca Institute of Nuclear Sciences, Belgrade, Serbia
Radojica Pesic
Nuclear Facilities of Serbia, Belgrade, Serbia
Paper No:
ICEM2011-59006, pp. 907-909; 3 pages
Published Online:
August 17, 2012
Citation
Plecas, I, Dimovic, S, & Pesic, R. "Curing Time Effect on the Fraction of 137Cs From Immobilized Radioactive Evaporator Sludge by Portland Cement." Proceedings of the ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B. Reims, France. September 25–29, 2011. pp. 907-909. ASME. https://doi.org/10.1115/ICEM2011-59006
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