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47:. A reactor achieves criticality (and is said to be critical) when each fission releases a sufficient number of neutrons to sustain an ongoing series of nuclear reactions.
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Criticality is the normal operating condition of a nuclear reactor, in which nuclear fuel sustains a
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as the date when the reactor is made critical for the first time. This is an important
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Nuclear reactor state where the nuclear chain reaction is exactly self-sustaining
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is zero. In supercritical states, reactivity is greater than zero.
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