The electrical system of reprocessing plants is designed to provide reliable power for the operation of the entire facility. In particular, the emergency power supply system must be capable of starting all emergency loads within the safety systems during design basis accidents (DBAs) conditions and supplying power to them. This ensures that nuclear safety objectives, as well as other goals related to preventing and mitigating accidents, are effectively met. Since the Fukushima earthquake, beyond design basis external events (BDBEEs) have significantly impacted the design of nuclear power plants. Given that the design concept of reprocessing plants differs from that of nuclear power plants, it follows that strategies for addressing BDBEEs should also diverge accordingly. This paper examines both the potential risks and consequences associated with electrical system failures in reprocessing plants under conditions involving BDBEEs from a design perspective. Based on these analytical conclusions, we propose specific design strategies aimed at enhancing system reliability through improved system architecture, emergency response measures, and functional optimization. These strategies are intended to mitigate potential hazards associated with accidents while bolstering overall safety and reliability within the electrical systems of reprocessing plants.