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500 MWe Prototype Fast Breeder Reactor Achieves Criticality in Tamil Nadu
India's Nuclear Leap: Kalpakkam's Fast Breeder Reactor Attains First Criticality New Delhi, April 7, 2026 — Marking a monumental achievement in India’s quest for long-term energy security, the 500 MWe Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, Tamil Nadu, has successfully attained its first criticality. This historic event—the start of a controlled fission chain reaction—occurred on the evening of April 6, 2026, at 8:25 PM.