A Self-Sustaining Chain Reaction Begins
India's Prototype Fast Breeder Reactor at Kalpakkam has attained criticality, marking the point at which a controlled, self-sustaining nuclear chain reaction begins. Prime Minister Narendra Modi announced the achievement on Monday, April 6th, describing it as a "defining" step in India's civil nuclear quest. The 500-megawatt electric facility, located near Chennai in Tamil Nadu, represents the most advanced domestically designed nuclear reactor the country has built.
Fuel Independence and Long-Term Energy Security
The reactor's ability to produce more fuel than it consumes positions India to move toward nuclear self-reliance. Modi stated that the "indigenously designed and built" reactor "reflects the depth of our scientific capability and the strength of our engineering enterprise." This milestone advances the second stage of India's three-step nuclear program and brings the country closer to harnessing its vast thorium reserves in the third stage.
Once fully operational, India will become only the second country after Russia to operate a commercial Fast Breeder Reactor. The achievement matters because these reactors generate more fissile material than they use, making them valuable for countries seeking long-term nuclear sustainability without constant fuel imports.
The sources also report that the Prototype Fast Breeder Reactor is a 500-megawatt electric facility, emphasizing its significance in generating more fissile material than it consumes.
Scaling Toward 2047 Goals
India, the world's third-largest emitter of greenhouse gases, is pursuing an ambitious expansion of nuclear power capacity from eight gigawatts currently to 100 gigawatts by 2047. The reactor's operation will support India's broader effort to diversify its energy sources and reduce dependence on fossil fuels while meeting growing electricity demand.
The sources also report that Modi toured the Kalpakkam facility in 2024 to witness the start of core loading.