Full Core Optimization of Small Modular Gas-Cooled Fast Reactors Using OpenMC Program Code

Abstract

Indonesia has many small regions and islands with low electrification ratio that needs small power plants. Gas-cooled Fast Reactors (GCFR) is one of the fourth generations of an advanced nuclear power plant with an improved safety system and optimum electricity production that match Indonesia's energy needs. The neutronic analysis study and optimization of small modular GCFR has been performed with Monte Carlo method OpenMC code that use computational parallelization to speed up calculation time. The full core reactor design is cylindrical with a radius 100 cm and height is 120 cm. Additional 50 cm of radius and 40 cm for the height for the reflector. The core using several types of fuel composed of natural Uranium mixed with spent fuel Plutonium. The variation in fuel fraction pin and percentages of Plutonium in fuel to achieved optimum core design. The design of core reactor has flattened flux and power distribution.