Kalpakkam's 500 MW PFBR Edges Towards Commercial Operations

India's ambitious nuclear energy programme moved a step closer to a major milestone as Dr. A.K. Mohanty , Chairman of the Atomic Energy Commission (AEC) and Secretary of the Department of Atomic Energy (DAE) , reviewed the progress of the 500 MW Prototype Fast Breeder Reactor (PFBR) at Kalpakkam in Tamil Nadu.

During the visit, Dr. Mohanty assessed the reactor's current status along with P.A. Suresh Babu , Chief Managing Director of BHAVINI (Bharatiya Nabhikiya Vidyut Nigam Limited) , and senior officials. The review focused on ongoing low-power physics experiments and the critical overhauling of the Turbine Generator (TG) system , a key requirement before the reactor can be synchronized with the national power grid.

The turbine overhaul is being undertaken by Bharat Heavy Electricals Limited (BHEL) , the original equipment manufacturer. The PFBR's 500 MW turbine generator features a tandem-compound design with separate high-pressure, intermediate-pressure and low-pressure cylinders. Powered by superheated steam generated through sodium-heated steam generators, the system receives up to 2,025 tonnes of steam per hour at 177 kg/cm² pressure and 493°C temperature to generate electricity.

The visit comes months after the reactor achieved first criticality on April 6, 2026 , marking the beginning of a self-sustaining nuclear chain reaction. The achievement signified India's entry into the second stage of its three-stage nuclear power programme , envisioned by nuclear pioneer Dr. Homi J. Bhabha .

Considered one of India's most advanced nuclear projects, the PFBR has an electrical generation capacity of 500 MWe and a thermal output of 1,253 MWt . Once fully operational, it is expected to generate nearly 4 billion units of electricity annually , enough to power millions of homes while providing reliable, low-carbon baseload energy.

What makes the reactor unique is its fast breeder technology , which enables it to produce more fissile fuel than it consumes. Using uranium-plutonium mixed oxide (MOX) fuel and liquid sodium coolant, the reactor will play a crucial role in enhancing India's energy security and supporting future utilization of the country's vast thorium reserves .

With BHAVINI already initiating pre-project activities for a twin-unit fast breeder project adjacent to the existing site, the PFBR is expected to serve as the foundation for a future fleet of advanced reactors. As the project moves toward grid synchronization and commercial power generation , it marks a significant step in India's quest for long-term nuclear fuel self-reliance and clean energy growth.