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        Computational design and characterization of a subcritical reactor assembly with TRIGA fuel

        Alvie Asuncion-Astronomo,Ziga Stancar,Tanja Goricanec,Luka Snoj 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2

        The TRIGA fuel of the Philippine Research Reactor-1 (PRR-1) will be used in a subcritical reactor assembly(SRA) to strengthen and advance nuclear science and engineering expertise in the Philippines. SRA offersa versatile and safe training and research facility since it can produce neutrons through nuclear fissionreaction without achieving criticality. In this work, we used a geometrically detailed model of the PRR-1TRIGA fuel to design a subcritical reactor assembly and calculate physical parameters of different fuelconfigurations. Based on extensive neutron transport simulations an SRA configuration is proposed,comprising 44 TRIGA fuel rods arranged in a 7 7 square lattice. This configuration is found to have amaximum keff value of 0:95001±0:00009 at 4 cm pitch. The SRA is characterized by calculating the 3-dimensional neutron flux distribution and neutron spectrum. The effective delayed neutron fraction andmean neutron generation time of the system are calculated to be 748 pcm±7 pcm and 41 ms, respectively. Results obtained from this work will be the basis of the core design for the subcritical reactorfacility that will be established in the Philippines.

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