When Nuclear fuel sustains the fission chain reaction inside a nuclear reactor, the reactor is said to be critical. In this, the amount of neutrons produced by nuclear fission becomes equal to or greater than the number of neutrons produced by the nuclear material. Nuclear fuel maintains the fission chain reaction, or criticality, during normal reactor operation. A reactor reaches criticality when each fission event produces enough neutrons to maintain a continuous chain of events.
The fourth unit of the Kakrapar Atomic Power Station (KAPS) in Gujarat has reached its initial criticality – the beginning of the regulated fission reaction – clearing the way for its final transformation to generate commercial Electricity.
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