India has achieved a major milestone in its civil nuclear programme, with the Prototype Fast Breeder Reactor (PFBR) at Kalpakkam attaining first criticality—marking the point at which a sustained nuclear fission reaction is established. The development represents a decisive step into the second stage of the country’s long-envisioned three-stage nuclear power programme, originally conceptualised by Homi J Bhabha.

Describing the achievement as historic, Sreekumar G Pillai, Director of the Indira Gandhi Centre for Atomic Research (IGCAR), said the moment goes beyond the commissioning of a reactor and reflects decades of scientific effort. He noted that the milestone strengthens India’s long-term energy strategy by enabling optimal utilisation of limited uranium resources while unlocking the potential of abundant thorium reserves.

The PFBR, India’s first commercial-scale fast breeder reactor, places the country among a select group of nations with such advanced nuclear capabilities. Unlike conventional reactors, fast breeder reactors generate more fissile material than they consume, making them crucial for sustainable nuclear energy production. The project has been developed over more than two decades, involving extensive research, engineering innovation, and institutional collaboration.

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Officials highlighted that the reactor operates using liquid sodium as a coolant, a technology that allows efficient heat transfer but requires high levels of precision due to its reactive nature. Challenges in materials, control systems, and high-temperature operations contributed to the project timeline, but scientists described the process as a valuable learning experience that has generated unique expertise within India’s nuclear sector.

The PFBR also plays a key role in India’s closed fuel cycle strategy, where spent fuel from reactors is reprocessed to extract plutonium for reuse. This approach reduces dependence on external fuel sources and enhances long-term energy security. According to experts, the reactor is capable of producing more fuel than it consumes, a feature that has led to it being likened to an “Akshay Patra,” symbolising a self-sustaining source of energy.

With first criticality achieved, the reactor will now undergo a series of tests and gradual power increases before reaching full commercial operation, expected within the next several months. Preparations are already underway for additional fast breeder reactors, as India aims to expand its nuclear capacity and move closer to energy independence while contributing to low-carbon power generation goals.

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