India Achieves Major Nuclear Milestone as Fast Breeder Reactor Reaches Criticality

New Delhi: In a significant boost to India’s energy ambitions, the government on Tuesday highlighted the importance of fast breeder reactors in delivering reliable, low-carbon base-load power with higher thermal efficiency, as the country’s 500 MWe Prototype Fast Breeder Reactor (PFBR) achieved first criticality.

The milestone marks the successful initiation of a controlled nuclear fission chain reaction and is being seen as a major step towards strengthening India’s long-term energy security and advancing its indigenous nuclear technology capabilities.

The PFBR, located at Kalpakkam Nuclear Complex, reached criticality after meeting all safety requirements set by the Atomic Energy Regulatory Board (AERB), which granted clearance following a comprehensive review of the reactor systems.

Prime Minister Narendra Modi described the achievement as a “defining step” in India’s civil nuclear journey. In a message shared on X (formerly Twitter), he said the development advances the second stage of India’s nuclear programme and reflects the nation’s growing scientific and engineering strength.

He emphasised that the reactor’s ability to produce more fuel than it consumes represents a crucial advancement, particularly in moving towards the utilisation of India’s vast thorium reserves in the third stage of the nuclear programme.

The PFBR has been indigenously designed by the Indira Gandhi Centre for Atomic Research (IGCAR) and built by Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI), a public sector undertaking under the Department of Atomic Energy.

Fast breeder reactors are a key component of India’s three-stage nuclear power strategy. Unlike conventional reactors, the PFBR uses uranium-plutonium mixed oxide (MOX) fuel and can generate more fissile material than it consumes by converting uranium-238 into plutonium-239.

It is also designed to eventually utilise thorium-232 to produce uranium-233, paving the way for sustainable and large-scale clean energy generation based on India’s abundant thorium reserves.

Officials noted that the achievement bridges current nuclear technologies with future thorium-based systems, while improving fuel efficiency and reducing waste through a closed fuel cycle. The PFBR also features advanced safety systems and liquid sodium cooling technology.

The development underscores India’s growing capabilities in indigenous design, engineering, and manufacturing, and aligns with the government’s Atmanirbhar Bharat initiative aimed at boosting self-reliance in critical sectors.

With inputs from IANS