India Achieves Criticality in Prototype Fast Breeder Reactor

On April 6, 2026, Prime Minister Narendra Modi announced that the Prototype Fast Breeder Reactor (PFBR) located in Kalpakkam, Tamil Nadu, has achieved criticality. This event is considered a significant milestone in India's civil nuclear journey and represents a crucial advancement in the second stage of the country's three-stage nuclear program. Modi emphasized that the PFBR, which has been indigenously designed and constructed, is capable of generating more nuclear fuel than it consumes.

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The achievement of criticality in the PFBR is viewed as a decisive step towards harnessing India's extensive thorium reserves, which are integral to the third stage of the nuclear program. Modi highlighted that this development not only showcases India's scientific capabilities but also reflects the strength of its engineering expertise. He expressed pride in the accomplishment, congratulating the scientists and engineers who contributed to this project.

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In his announcement, Prime Minister Modi stated, “India takes a defining step in its civil nuclear journey, advancing the second stage of its nuclear programme.” He characterized the achievement as a proud moment for the nation, reinforcing the importance of indigenous technological advancements in the field of nuclear energy.

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While the announcement has been met with praise from government officials and proponents of nuclear energy, there are concerns regarding the safety and environmental implications of nuclear reactors. Critics argue that the focus on nuclear energy should be balanced with investments in renewable energy sources to ensure a sustainable energy future.

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Following this milestone, the Indian government is expected to continue its efforts in advancing the nuclear program, particularly focusing on the utilization of thorium in future reactors. The success of the PFBR may pave the way for further developments in nuclear technology and energy production in India.

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• “India takes a defining step in its civil nuclear journey, advancing the second stage of its nuclear programme,” — Narendra Modi, Prime Minister of India

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• “He added that the achievement reflects the depth of India’s scientific capability and the strength of its engineering expertise.” — Narendra Modi, Prime Minister of India

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The successful attainment of criticality in the PFBR marks a pivotal moment in India's nuclear ambitions, with potential implications for energy production and technological advancement in the coming years.

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