Abstract
Neutronic analysis of UN-PuN fuel use FI-ITB-CHI code for 500MWth GFR longlife without refuelling has been done. The reactor use fast neutron spectrum, helium coolant and stainless steel for the cladding. The FI-ITB-CHI is code to calculate the neutronic analysis both fuel pin and core calculation. The parametric survey of various Plutonium percentages with homogeneous core configuration and variation of fuel volume fraction has been done. The variation is from 8% percentage of Pu up to 15% percentage of Pu. The 11% percentage of Plutonium has k-eff value more stable than the others, or we can say that it has critical condition. And the variation of fuel volume fraction is from 40% up to 60%. When the fuel volume fraction is increase, the reactor can be operated longer than small fuel volume fraction. The 60% of fuel volume fraction has optimum value in this case. For heterogeneous core configuration, there is three type of fuel, i.e. fuel 1 (F1), fuel 2 (F2) and fuel 3 (F3). The percentage plutonium of F3 is varied from 13%, 13.5% and 14%. The optimum value for heterogeneous core configuration is use case 1 which is use 8% percentage of plutonium for F1, 10% for F2 and 14% for F3. The reactor can be operated almost 25 years without refueling.
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