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PFBR Criticality
April 9 , 2026
16 hrs 0 min
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- India’s PFBR (Prototype Fast Breeder Reactor) at Kalpakkam, Tamil Nadu, achieved criticality.
- Criticality means a self-sustaining nuclear fission chain reaction starts in the reactor.
- PFBR is a 500-megawatt electric sodium-cooled fast breeder reactor using plutonium fuel.
- It is operated by Bharatiya Nabhikiya Vidyut Nigam Limited (BHAVINI) at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam.
- Fast breeder reactors produce more fissile fuel than they consume.
- It marks the second stage of India’s three-stage nuclear power programme using plutonium and later thorium.
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