Follow India Renewable Energy News on WhatsApp for exclusive updates on clean energy news and insights

PFBR Achieves First Criticality, Marking Major Progress in India’s Nuclear Energy Programme

India has reached a significant milestone in its nuclear energy journey as the 500 MW Prototype Fast Breeder Reactor (PFBR) successfully achieved first criticality, marking the initiation of a controlled nuclear fission chain reaction. The development is being seen as a major advancement in the country’s pursuit of long-term energy security.

The Department of Atomic Energy (DAE) described the achievement as a landmark moment that strengthens India’s indigenous nuclear capabilities. It also represents a crucial step toward optimising the use of limited uranium resources while advancing preparations for large-scale utilisation of thorium in the future.

This progress brings India closer to realising its three-stage nuclear power programme. The PFBR serves as a critical link between existing pressurised heavy water reactors and the future deployment of thorium-based systems, enabling more efficient use of nuclear fuel and supporting sustainable energy generation.

Unlike conventional reactors, fast breeder reactors are designed to generate more fuel than they consume. The PFBR operates using uranium-plutonium mixed oxide fuel, surrounded by a blanket of uranium-238. Through neutron interactions, this setup produces additional fissile material, enhancing overall fuel efficiency.

The reactor is also designed to incorporate thorium-232, which can be converted into uranium-233 for use in the next phase of India’s nuclear programme. Equipped with advanced safety mechanisms, sodium-based cooling technology, and a closed fuel cycle, the PFBR enables recycling of nuclear materials, improving sustainability while reducing waste.

Beyond electricity generation, the project strengthens India’s expertise in key areas such as nuclear fuel cycle technologies, reactor design, advanced materials, and large-scale engineering. Fast breeder reactors are expected to play an important role in delivering reliable, low-carbon base-load power with improved efficiency.

Experts have described the development as a pivotal step toward energy independence. Former Atomic Energy Commission Chairman Anil Kakodkar highlighted the importance of nuclear energy, particularly thorium, in meeting India’s long-term energy needs with domestically available resources.

V.K. Saraswat of NITI Aayog noted that sodium-cooled reactors allow operation at higher temperatures, improving efficiency while reducing water consumption compared to conventional systems. Meanwhile, nuclear scientist R.K. Singh indicated that the milestone signals the beginning of a replication phase, with additional fast breeder reactors planned at Kalpakkam.

Overall, the successful achievement of criticality at the PFBR underscores India’s growing capability in advanced nuclear technologies and reinforces its commitment to expanding clean and reliable energy sources.