Abstract
As one of the advanced reactors new generation concept, Gas-cooled Fast Reactors can achieve higher electricity efficiency compare to the previous generation. The modular design is perfectly matched with Indonesia region that has many small islands. In this paper will be discussed about the design study of the fuel assembly for modular nuclear power plants using helium as cooling (GFR). The design reactors with hexagonal assembly and square assembly as a comparison to see which assembly configuration in GFR to get optimum results. Calculation for neutronic used Monte Carlo method with parallelization to accelerate computing time. Using OpenMC program code to build full three-dimension core simulation and neutronic calculation with nuclear data ENDF/B-VIII.b5 as a library. The neutronics results show the optimum design can be achieved.
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