India has quietly marked a significant milestone in its long-term energy strategy, as the Prototype Fast Breeder Reactor (PFBR) at the Kalpakkam Nuclear Complex achieved “criticality” on Wednesday evening at approximately 8:25 PM.This development signifies that the reactor has reached a self-sustaining nuclear fission chain reaction, meaning it can now maintain the process of neutron generation and energy release without external intervention. In nuclear engineering terms, achieving criticality is a crucial step before a reactor begins full-scale power generation.
A Key Step in India’s Three-Stage Nuclear Programme The PFBR milestone marks the operational advancement of the second stage of India’s three-stage nuclear power programme, originally envisioned by Homi Jehangir Bhabha in the 1950s and 1960s. The programme is strategically designed to maximize the use of India’s limited uranium reserves while tapping into its vast thorium resources.The PFBR has been developed by BHAVINI in collaboration with the Indira Gandhi Centre for Atomic Research (IGCAR), both of which have played central roles in advancing India’s indigenous nuclear capabilities.Prime Minister Narendra Modi described the achievement as a “defining step” in India’s journey toward energy security and technological self-reliance.
Understanding the Significance of Fast Breeder Reactors Unlike conventional nuclear reactors, fast breeder reactors are designed not only to generate power but also to produce more fissile material than they consume. The PFBR uses plutonium-based fuel and is capable of converting fertile materials like uranium-238 into additional fissile fuel, thereby enhancing resource efficiency.This capability is critical for India, which possesses modest uranium reserves but holds one of the world’s largest thorium deposits, estimated to be over 25% of global reserves.
The Thorium Advantage Thorium, while not directly fissile, can be converted into uranium-233 in breeder reactors, enabling a sustainable and long-term nuclear fuel cycle. Experts highlight that thorium-based energy has the potential to provide large-scale, low-carbon electricity for centuries.India’s current annual electricity generation stands at roughly 170–190 gigawatt-years. In contrast, the country’s thorium reserves, if fully utilized, could theoretically support energy production on a vastly larger scale over extended periods, significantly strengthening energy independence.
Indigenous Effort and Scientific Achievement The PFBR is a fully indigenous project, reflecting decades of sustained research, engineering, and innovation by Indian scientists, engineers, and technicians. The achievement underscores India’s growing expertise in advanced nuclear technologies, a domain mastered by only a handful of countries.While the milestone has not received widespread public attention, it represents a pivotal moment in India’s transition toward cleaner and more self-reliant energy systems.
Looking Ahead Following the attainment of criticality, the reactor will undergo further testing and calibration phases before being connected to the power grid. Once operational, it is expected to play a key role in advancing India’s nuclear energy capacity and in paving the way for large-scale thorium utilization.As global energy challenges intensify, India’s progress at Kalpakkam signals a strategic shift, one that could redefine its energy landscape for generations to come.
contact: drrajeshjauhri@gmail.com
Dr Rajesh Jauhri is a Journalist with an experience of over 25 years in Indian and foreign media, a Social Scientist, an Ac-complished Author, a Political & Strategic Analyst, a Marksman (Rifle & Pistol), an Orator, a Thinker and an Educationist. He holds a Ph.D. degree on “Impact of colonial heritage on Indian police”. He runs an NGO dedicated to the social and eco-nomic uplift of tribal communities in MP and two decades back, he established a school in a village of Indore district, providing education and moral values to children belonging to underprivileged and minority families. Has received multiple awards in various fields.
