Analisis Neutronik Pin Bahan Bakar Reaktor TRIGA Kartini pada Hot Channel Menggunakan OpenMC

Abstract

The research of one TRIGA Kartini reactor fuel pin conducted neutronic analysis of the fuel pin of the Kartini reactor in the hot channel using OpenMC software. As a free, open-source-based software, OpenMC is an alternative choice that can be used compared to other licensed software. The study also focuses on the application of OpenMC as a new and never-before-used method for neutronic analysis of the Kartini reactor. This study aims to conduct neutronic analysis on multiplication factors, flux distribution, fission rate, and neutron energy spectrum. The geometry of the fuel pin of the TRIGA Kartini reactor has a cylindrical shape. The arrangement of fuel pins consists of fuel, gaps, sleeves, coolant. The simulation was carried out using the UZrH configuration which has an enrichment of 19.75% with the cladding material being SS304 and water used as a moderator. The condition of the reactor during the simulation is shown by the factor of infinite multiplication (k-inf), being in a supercritical state in theory. The use of the k-inf value is due to the calculation of the fuel pin without considering neutron leakage. The distribution of neutron flux shows fission reactions radially and axially. The neutron flux distribution is shown in the form of visualizations and graphs. The fission rate pattern is the same as the neutron flux, i.e. the fission reaction is in the center of the fuel pin. The neutron energy spectrum shows the distribution of neutron energy inside the reactor. The TRIGA Kartini reactor is a thermal reactor because of its moderation using water. The results of this study provide a preliminary overview of the neutronic behavior of a single fuel pin before being analyzed in the configuration of the entire reactor core. The parameters obtained are influenced by the shape of the refrigerant array, the limits used, the number of particles and the size of the pin core. This study uses a ring-shaped refrigerant arrangement to match the design of the Kartini reactor. There are two limits used, namely vacuum limits for the axial part and reflective brick for the sides. The more particles used, the more appropriate the results obtained