Optimizing Fuel Management Strategy for PeLUIt-40

The PeLUIt-40 reactor design, which stands for Pembangkit Listrik dan Uap Panas Industri (Industrial Power and Steam Generation Plant), is a proposed solution for electricity and cogeneration applications in Indonesia, is an adaptation of China's successful HTR- 10, the first High Temperature Gas-cooled Reactor (HTGR) in the country. PeLUIt- 40 boasts a fourfold increase in power compared to the HTR-10, enhancing its capacity for electricity generation and cogeneration. The fuel management strategy employed by the HTR-10 involves five passes of fuel through the reactor core, ensuring each fuel element reaches the desired target burnup in equilibrium state. However, there is a lack of studies demonstrating fuel management strategies for designs with such significant power increases, as in the case of PeLUIt-40. Therefore, this study aims to analyze the most optimal fuel management strategy for PeLUIt-40 using the PANGU and DAYU codes developed at the Institute of Nuclear and New Energy Technology (INET). The PANGU code is utilized for analyzing neutronics in pebble-bed HTGRs and simulating fuel cycles, while the DAYU code is employed for analyzing thermal-hydraulic aspects. The simulation results for HTR10 closely match measurements across all steady-state power periods. The aspects to be analyzed include burnup, keff, power distribution, PPF, outlet temperature, and temperature during Depressurized Loss of Forced Cooling (DLOFC) occurrences.