The bulk planar junctionless transistor (BPJLT) is a potential candidate for future CMOS technologies due to its CMOS compatibility and scalability. In this paper, the impact of silicon film thickness and channel doping on single-event upset (SEU) radiation performance of BPJLT based SRAMs is studied using TCAD simulations. The simulation results show that BPJLT devices having higher channel doping and smaller film thickness provides the better SEU performance.