IAEA Chief Grossi Calls India's Kalpakkam PFBR Criticality "Impressive"

India achieved a major milestone in its nuclear programme when the Prototype Fast Breeder Reactor (PFBR) at Kalpakkam attained criticality on April 6, 2026, drawing praise from the International Atomic Energy Agency (IAEA). IAEA Director General Rafael Mariano Grossi hailed the feat as "impressive progress," noting it marks a key step toward fuel sustainability and advanced nuclear energy. The 500 MWe reactor, indigenously designed and built by Bhava Atomic Research Institute (BHAVINI), now sustains a self-sustaining nuclear chain reaction.

Prime Minister Narendra Modi celebrated the breakthrough as a "defining step" in India's three-stage nuclear strategy, advancing to stage two where fast breeders breed more fissile material than consumed. Unlike conventional reactors relying on scarce uranium, the PFBR uses plutonium-239 and uranium-238 to produce power while generating additional fuel, optimizing India's vast thorium reserves for stage three. This positions India as the second nation after Russia with commercial fast breeder capability.

The project involved over 200 Indian industries, including MSMEs, aligning with Aatmanirbhar Bharat's self-reliance push despite international sanctions limiting technology access. Built over 14 years at a cost of around Rs 7,000 crore, the sodium-cooled reactor enhances energy security amid India's rising power demands and net-zero goals. Grossi reaffirmed IAEA support for India's safe nuclear expansion.

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Located 80 km south of Chennai, Kalpakkam already hosts two operational Pressurized Heavy Water Reactors (PHWRs) contributing 1,400 MWe. The PFBR's success validates decades of R&D by the Indira Gandhi Centre for Atomic Research (IGCAR), overcoming challenges like mixed oxide fuel fabrication and safety systems. It promises reduced nuclear waste and prolonged fuel cycles.The aerial view captures the sprawling PFBR facility, symbolizing India's engineering prowess amid coastal greenery and industrial infrastructure.

Global experts view this as boosting India's clean energy credentials, with potential for exports of fast reactor tech. While full commercial operation awaits fuel loading and grid connection by late 2026, the milestone elevates India's stature in non-proliferation compliant nuclear innovation.As India targets 22,480 MWe nuclear capacity by 2031-32, Kalpakkam's PFBR exemplifies strategic autonomy, drawing international acclaim for safety and sustainability amid climate imperatives.

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