Design Study of 300MWth GFR with UN-PuN Fuel using SRAC-COREBN Code

Abstract

Research related to 300MWth with UN-PuN fuel optimization on GFR using 3D core (X-Y-Z) with the code SRAC-COREBN has been carried out. UN-PuN fuel optimization was carried out by studying neutronic parameter analysis on variations in the addition of Pu-239 percentages in homogeneous and heterogeneous core configurations, as well as on variations in fuel volume fractions. The design of the reactor core is cylindrical pancake with a diameter of 300 cm and a height of 100 cm. Neutronic calculations are carried out in two steps, the first is the calculation of burn-up per fuel pin using the PIJ code system on SRAC and the JENDL4.0 nuclide library. The second calculation is the calculation of burn-up at the reactor core level using the COREBN code. The results of the core burn-up calculation analyzed were neutronic parameters, such as k-eff, excess reactivity, and power density. The optimal design based on the neutronic parameter analysis that has been carried out is a fuel volume fraction of 64% with a heterogeneous core configuration of 3 types of fuel percentage, fuel 1- fuel 2- fuel 3 = 7.5%-8%-8.5%. The maximum k-eff value is 1.0031841 with a maximum excess reactivity of 0.32%. The maximum power density for the X and Y directions is 70.78 Watt/cc; while for the Z direction it is 67.97 Watt/cc.