Abstract
Thorium can be used for next generation nuclear reactor fuel since its has 3-4 times more abundance and will produce less nuclear high level waste compared to uranium. In this analysis, ThO2-UO2 fuel is used with variation of enriched U-235 to determine the criticality condition of Westinghouse advanced nuclear reactor AP1000. Neutronic calculations have been performed using SRAC 2006 code system with JENDL 4.0 nuclear data library. AP1000 can achieve it criticality when a minimum enrichment of UO2 is 4.45% with the maximum amount of the ThO2 fuel rods in the fuel assembly are 1.5%. The convertion ratio for ThO2- UO2 fuel tends to increase and the neutron spectra became harder with the escalating of the amount of the ThO2.
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