Major step in nuclear energy programme
PFBR Reactor Criticality Milestone in India: India achieved a key milestone as the Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, Tamil Nadu attained criticality in 2026. This marks the beginning of a self-sustaining nuclear chain reaction.
The reactor is developed and operated by Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI) at the Indira Gandhi Centre for Atomic Research (IGCAR). This progress signals India’s transition into the second stage of its nuclear programme.
Understanding criticality
Criticality refers to a stable state where each nuclear fission releases enough neutrons to sustain the reaction continuously. It ensures that the reactor operates without external neutron sources.
This stage is essential for reactor safety validation and precedes full-scale electricity generation.
Static GK fact: Nuclear fission was first demonstrated in 1938 by Otto Hahn and Fritz Strassmann, forming the basis of nuclear reactors.
Features of the PFBR
The PFBR is a 500 MWe sodium-cooled fast breeder reactor developed indigenously over more than 20 years. It uses plutonium-based mixed oxide fuel instead of uranium.
Unlike conventional reactors, it produces more fissile material than it consumes, improving fuel efficiency. Sodium is used as a coolant due to its excellent heat transfer properties.
Role in three-stage nuclear programme
India’s nuclear strategy was designed by Dr. Homi Jehangir Bhabha. It consists of three stages aimed at optimal utilisation of available resources.
In the second stage, plutonium from Pressurised Heavy Water Reactors (PHWRs) is used in fast breeder reactors like PFBR. This enables the future shift to thorium-based reactors in the third stage.
Static GK Tip: India possesses one of the world’s largest reserves of thorium, mainly found in monazite sands of Kerala and Tamil Nadu coasts.
Strategic and economic significance
The PFBR strengthens India’s energy security and reduces dependence on imported uranium. It supports India’s clean energy goals, including achieving net zero emissions by 2070.
Fast breeder technology enables fuel recycling, making nuclear power more sustainable. It also enhances India’s position in advanced nuclear technology globally.
Way ahead
Successful commissioning of PFBR will pave the way for more fast breeder reactors in India. The government plans to expand nuclear power capacity to 100 GW by 2047.
Continued investment in research, safety, and infrastructure will be critical for scaling up nuclear energy production.
Static Usthadian Current Affairs Table
PFBR Reactor Criticality Milestone in India:
| Topic | Detail |
| Reactor Name | Prototype Fast Breeder Reactor |
| Location | Kalpakkam, Tamil Nadu |
| Capacity | 500 MWe |
| Operator | BHAVINI |
| Key Feature | Produces more fissile fuel than consumed |
| Programme Stage | Second stage of nuclear programme |
| Fuel Type | Plutonium-based mixed oxide fuel |
| Strategic Goal | Energy security and reduced uranium imports |
