Closed Nuclear Fuel Cycle

India adheres to a Closed Nuclear Fuel Cycle, a strategy specifically designed to optimize its limited uranium resources and harness its large thorium reserves. This approach is central to India’s three-stage nuclear power programme, which aims to ensure long-term energy security.

India’s Three-Stage Nuclear Power Programme

The Closed Nuclear Fuel Cycle involves the recovery and recycling of fissile and fertile materials from spent nuclear fuel (SNF). This contrasts with the open fuel cycle, where SNF is treated as waste.

Stage 1: Pressurised Heavy Water Reactors (PHWRs)

• Objective: To utilize India’s domestic uranium resources.
• Process: PHWRs use natural uranium as fuel. The spent fuel from these reactors is then reprocessed to obtain plutonium.

Stage 2: Fast Breeder Reactors (FBRs)

• Objective: To utilize the plutonium recovered from the first stage.
• Process: FBRs use this plutonium as fuel, while also breeding more fissile material from fertile materials like uranium-238 and thorium.
• Status: To support this stage, India has established facilities like the Fast Breeder Test Reactor. The Prototype Fast Breeder Reactor (PFBR) and an integrated nuclear reprocessing plant are currently under construction in Kalpakkam.

Stage 3: Thorium-based Reactors

• Objective: To exploit India’s vast thorium reserves for sustainable energy.
• Process: In this final stage, thorium-232 is converted into a fissile isotope, uranium-233. This U-233 is then used as fuel in advanced reactors.

This entire programme enhances the utilization of nuclear materials, improves energy security, and reduces the volume of high-level radioactive waste.

(Source: PIB)