Analysis Of Burnable Poison Doping on Fuel Molten Mixture for Molten Salt Reactor (MSR) Fuji-12

Nuclear Power Plants (NPPs) are a type of power generator that supports Sustainable Development Goals (SDGs) by producing clean, affordable, and climate-friendly energy. This study simulated the MSR FUJI-12 to determine suitable SRAC 2006 parameters with a PIJ module for cell calculation and CITATION module for core calculation. The simulation results showed an initial keff of 1.013046 for a 233 UF 4 concentration of 0.22%, with a deviation of 0.0354% from the target of 1.0134. However, the final keff remained below 1, at 0.9455, prompting an increase in the 233 UF 4 concentration to 0.28%. One of the challenges identified was the high Power-Peaking-Factor (PPF) of 3.49, that may damage the inside coating of reactor chamber. Using Protactinium as burnable poison and actinide producer to stabilize the keff, it was concluded that the doping on molten mixture is 0.003% to avoid un-criticality on MSR FUJI-12. However, the impact of doping is unsignificant to the PPF. It is then proposed using other types of burnable poison, such as Americium (Am) and Gadolinium (Gd). However, as it was known that only Protactinium that produces burnable actinide to fuel the core, the impact is negligible except for the Gd, as its doping is enough to decrease the initial keff and to increase the conversion ratio (CR) in MSR from 0.835 to 0.933.