India has achieved a major milestone in its civil nuclear energy programme as the country’s most advanced atomic reactor — the Prototype Fast Breeder Reactor (PFBR) — attained criticality at Kalpakkam, marking a decisive step toward operational readiness.

The development signifies that the reactor has successfully initiated a self-sustaining nuclear fission chain reaction, a crucial phase in the commissioning of any nuclear facility. While criticality does not mean the reactor is yet generating electricity at full capacity, it is among the most important technical milestones before power production begins.

The PFBR, a 500-megawatt electric sodium-cooled fast breeder reactor, has been indigenously designed and built over more than two decades by Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI) at the Indira Gandhi Centre for Atomic Research. The project represents one of the most complex engineering undertakings in India’s nuclear sector.

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Prime Minister Narendra Modi described the achievement as a “defining step” in India’s nuclear journey, highlighting the country’s growing scientific and engineering capabilities. Officials also noted that the milestone marks India’s transition into the second stage of its three-stage nuclear power programme, originally envisioned to maximise the use of domestic resources.

Unlike conventional reactors that primarily consume uranium, fast breeder reactors like the PFBR use plutonium-based fuel and are designed to produce more fissile material than they consume. This unique capability allows for fuel recycling and long-term sustainability, while also paving the way for the eventual use of India’s vast thorium reserves in future reactor designs.

Experts say the milestone strengthens India’s position in advanced nuclear technology, with only a few countries possessing operational fast breeder reactors. Once fully commissioned, the PFBR is expected to play a critical role in enhancing energy security, reducing carbon emissions, and supporting the country’s long-term clean energy goals.

The achievement is being seen as both a technological breakthrough and a strategic step toward energy self-reliance, as India seeks to expand its nuclear power capacity and reduce dependence on fossil fuels in the coming decades.

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