Lead coolant is a vital heat transfer fluid, preventing overheating and enabling heat transfer to other systems. It eliminates fire and water-coolant reactions linked to sodium. Designs using lead coolant offer higher temperatures, improved efficiency, and lower costs compared to water-cooled reactors. They operate as breeders or near-breeders, enhancing resource utilisation and aiding radioactive waste management. Lead coolant is ideal for industries requiring high-temperature stability, like fast breeder nuclear reactors.