India has taken a defining step in its civil nuclear journey, advancing the second stage of Homi Bhabha’s Three-Stage Nuclear Power Programme. The indigenously designed and built Kalpakkam Fast Breeder Reactor has attained criticality, marking a pivotal milestone in both technological capability and long-term energy economics.

Fast Breeder Reactors (FBRs) represent one of the most complex and capital-intensive frontiers in nuclear engineering. Unlike conventional reactors that consume fissile material, FBRs are designed to generate more fuel than they burn. By utilising plutonium (Pu-239) derived from Stage 1 reactors and surrounding the core with Uranium-238 and Thorium-232, these systems convert fertile material into additional fissile fuel, including Pu-239 and U-233. In effect, they expand the available energy resource base transforming scarcity into sustainability.

India’s nuclear programme was structured precisely for this transition. The first stage, built around Pressurised Heavy Water Reactors (PHWRs), created a steady pipeline of plutonium while delivering grid-scale........

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