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:: Volume 11, Issue 1 (1-2013) ::
Int J Radiat Res 2013, 11(1): 29-33 Back to browse issues page
Comparison of (Th-233U) O2 and (Th-235U) O2 fuel burn up into a thermal research reactor using MCNPX 2.6 code
S.A.H. Feghhi, Z. Gholamzadeh, L. Soltani, C. Tenreiro
Department of Physics, Talca University, Chile , Cadmium_109@yahoo.com
Abstract:   (8957 Views)

Background: Decrease of economically accessible uranium resources motivates consideration of breeding of fertile elements such as thorium. Material and Method: Thorium oxide fuel burn up calculation of a simulated research reactor cooled heavy water has been proposed in the present work using MCNPX 2.6 code. Two 233U and 235U isotopes have been used as fissile element of thorium oxide fuel. 135Xe and 149Sm reactivity variations has been studied in the core loaded (Th- 233U)O2 or (Th- 235U)O2 fuel matrixes during 3 months burn up process. Results: Thorium oxide having 4% 233U burned 1 MW power results in less 149Sm reactivity than thorium oxide having 4% 235U burned in 0.5 MW power. 135Xe reactivity has an overestimated shift by 15 days in the core operated in 0.5 MW than the other, after 15 days both the cores behave similarly. 480 g of 235U burns into the core using 0.5 MW power and 364 g of 233U invents after 3 months. Burn up calculation of the modeled core of (Th-233U)O2 fuel shows a fissile mass reduction by 60 days while the consumed fissile mass reaches to its initial value after 120 days. The core flux is constant during 3 months for both modeled cores. A considerable negative reactivity occurs up to 15 days in both cores which can be refer to xenon inventory during this time and then neutron multiplication factor is steadier up 3 months. Conclusion: Breeder thorium fuel enriched 233U make several advantages of good neutronic economy, 233U inventory and less inventory of long-lived alpha emitter wastes.

Keywords: Thorium oxide fuel, neutronic parameters, fuel burn up, 233U fissile material, 233U fissile material
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Type of Study: Original Research | Subject: Radiation Biology
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Feghhi S, Gholamzadeh Z, Soltani L, Tenreiro C. Comparison of (Th-233U) O2 and (Th-235U) O2 fuel burn up into a thermal research reactor using MCNPX 2.6 code . Int J Radiat Res. 2013; 11 (1) :29-33
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Volume 11, Issue 1 (1-2013) Back to browse issues page
International Journal of Radiation Research
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