India attains criticality for Prototype Fast Breeder Reactor at Kalpakkam
Change
India's indigenously designed Prototype Fast Breeder Reactor at Kalpakkam achieved a self-sustaining nuclear chain reaction (criticality), a milestone that advances its ability to breed more fuel than it consumes and enables future thorium-to-uranium-233 fuel production.
Why it matters
Final regulatory approvals, safety validations and commissioning tests are now required before the reactor can be declared in commercial operation or begin breeder-fuel production. Until those steps are complete, commitments that assume near-term commercial power output or thorium-derived fuel availability are blocked.
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