Prime Minister congratulates scientists and engineers as Prototype Fast Breeder Reactor at Kalpakkam attains criticality

• India's indigenously designed 500 MWe Prototype Fast Breeder Reactor (PFBR) at Kalpakkam, Tamil Nadu attained first criticality on 6 April 2026.
• Marks India's entry into Stage-II of Dr. Homi Bhabha's three-stage nuclear programme, unlocking eventual thorium utilisation in Stage-III.
• Makes India only the second country after Russia to operate a commercial-scale fast breeder reactor.
• High-yield UPSC topic spanning GS-III (S&T, energy security) and current affairs prelims.