New Delhi, April 8: India has marked a major advancement in its civil nuclear energy program as the Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, Tamil Nadu, successfully reached first criticality on April 6, 2026. This milestone reflects the country’s growing technological expertise and its ability to develop advanced nuclear reactors indigenously.
The 500-megawatt electrical PFBR, designed and constructed entirely by Indian institutions, is a sodium-cooled fast breeder reactor developed by BHAVINI (Bharatiya Nabhikiya Vidyut Nigam Ltd.) and the Indira Gandhi Centre for Atomic Research (IGCAR) under the Department of Atomic Energy. Attaining criticality means the reactor has achieved a controlled, self-sustaining nuclear chain reaction — a key step toward full power operations and electricity generation.
Prime Minister Narendra Modi congratulated the scientists and engineers, calling it a “defining moment” in India’s nuclear journey. He highlighted that fast breeder reactors like the PFBR not only produce energy efficiently but also generate more nuclear fuel than they consume, setting the stage for utilizing India’s vast thorium reserves in the future.
Unlike conventional reactors that primarily use uranium, fast breeder reactors are designed to extend nuclear fuel resources, making them crucial for long-term energy security. This positions India among a select group of countries with advanced capabilities in fast breeder technology.
The PFBR’s success underscores India’s indigenous engineering and scientific strength and contributes to the nation’s goal of sustainable, low-carbon energy production. As the reactor moves toward commercial operation, it is expected to enhance India’s nuclear capacity and support the growing energy demands of the country.
The achievement at Kalpakkam is a testament to India’s innovation in clean energy and reaffirms the nation’s strategic progress in advancing homegrown nuclear technology.
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