This Chapter introduces the Fast Breeder Reactor programme in India, towards meeting the energy demand in the country. The advantage of closed metallic fuel cycle for future energy security is emphasized. The complete overview on molten salt based pyrochemical reprocessing of the spent metallic fuels is discussed in detail. Various processing steps and the challenges involved in the development of materials for pyro-reprocessing are briefly explained. The main focus of this Chapter is on the materials and identifying protective coatings, issues and their implementation for successful pyrochemical reprocessing in the plant.