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Burn-up calculation of different thorium-based fuel matrixes in a thermal research reactor using MCNPX 2.6 code

Abstract

Decrease of the economically accessible uranium resources and the inherent proliferation resistance of thorium fuel motivate its application in nuclear power systems. Estimation of the nuclear reactor’s neutronic parameters during different operational situations is of key importance for the safe operation of nuclear reactors. In the present research, thorium oxide fuel burn-up calculations for a demonstrative model of a heavy water- -cooled reactor have been performed using MCNPX 2.6 code. Neutronic parameters for three different thorium fuel matrices loaded separately in the modelled thermal core have been investigated. 233U, 235U and 239Pu isotopes have been used as fissile element in the thorium oxide fuel, separately. Burn-up of three different fuels has been calculated at 1 MW constant power. 135X and 149Sm concentration variations have been studied in the modelled core during 165 days burn-up. Burn-up of thorium oxide enriched with 233U resulted in the least 149Sm and 135Xe productions and net fissile production of 233U after 165 days. The negative fuel, coolant and void reactivity of the used fuel assures safe operation of the modelled thermal core containing (233U-Th) O2 matrix. Furthermore, utilisation of thorium breeder fuel demonstrates several advantages, such as good neutronic economy, 233U production and less production of long-lived α emitter high radiotoxic wastes in biological internal exposure point of view

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‘Zero energy’ electron beam technology for sludge hygienization

the soil, when sewage sludge is used in agriculture . 12. Minister of Environment. (2010, July). Regulation of the Minister of Environment of 13 July 2010 on municipal sewage sludge. Dz. U ., 2010 , no. 137, item 924 (in Polish). 13. Minister of Economy. (2015, July). Regulation of the Minister of Economy of 16 July 2015 on the admission of waste for landfill. Dz. U. , 2015 , item 1277 (in Polish). 14. Dymaczewski, Z., Oleszkiewicz, J. A., & Sozański, M. M. (1997). Poradnik eksploatatora oczyszczalni ścieków . Poznań: Polskie Zrzeszenie

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Dictyonema black shale and Triassic sandstones as potential sources of uranium

References 1. Ministry of Economy, Government Commissioner for Nuclear Energy. (2014). Program of Polish Nuclear Energy. Warsaw. 2. Uranium 2014: Resources, production and demand. (2014). A Joint Report by the OECD Nuclear Energy Agency and the International Atomic Energy Agency. Paris: OECD. 3. Strzelecki, R., & Wołkowicz, S. (2011). Uran. In S. Wołkowicz, T. Smakowski & S. Speczik (Eds.), Bilans perspektywicznych zasobów kopalin Polski wg stanu na 31 XII 2009 r. (pp. 71-75). Warsaw: PIG-PIB. 4

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The dose of gamma radiation from building materials and soil

radionuclides in the soil and the environment of the city of Nis for the period 2011/2012 year. For the Directorate for Economy, Sustainable Development and Environmental Protection of the city of Niš, Niš. (in Serbian). 25. Hubbell, J. H. (1969). Photon cross sections, attenuation coeffi cients, and energy absorption coeffi cients from 10 keV to 100 GeV. National Bureau of Standards, Washington DC. (NSRDS-NBS 29). 26. Harima, Y., Tanaka, S., Sakamoto, Y., & Hirayama, H. (1991). Development of new gamma-ray buildup factor and application to

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