India Achieves Criticality in Prototype Fast Breeder Reactor at Kalpakkam

India's three-stage nuclear power program, envisioned by Homi J. Bhabha, aims to utilize the country's vast thorium reserves. The first stage involves Pressurized Heavy Water Reactors (PHWRs) using natural uranium.

The second stage, where the PFBR plays a critical role, focuses on Fast Breeder Reactors that convert thorium into fissile uranium-233, thereby breeding more fuel than they consume, primarily from plutonium derived from spent fuel of the first stage.

The third stage would use thorium-uranium-233 reactors. The recent achievement of criticality by the 500 MWe PFBR means the self-sustaining nuclear fission chain reaction has begun, generating heat. This represents a transition from a construction and commissioning phase to an operational phase, demonstrating India's advanced capabilities in nuclear technology, particularly in managing complex sodium-cooled reactors. This reactor is indigenously designed and built by Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI). This success is pivotal for India's energy independence, moving beyond reliance on imported uranium. Breeder reactors are key to unlocking India's thorium potential, estimated at 360,000 tonnes, which can sustain energy needs for centuries. The PFBR's operation will provide invaluable experience for future commercial fast breeder reactors, positioning India as a leader in advanced nuclear technology and enhancing its strategic autonomy in the energy sector, aligning with sustainable development goals.