Power Plant Engineering
The size of the reactor is said to be critical when

Chain reaction can be initiated
It produces no power
It becomes uncontrollable
It explodes

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Power Plant Engineering
A nuclear unit becoming critical means

It is capable of generating much more than rated capacity
There is danger of nuclear spread
Chain reaction that causes automatic splitting of the fuel nuclei has been established
It is generating power to rated capacity

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Power Plant Engineering
Enriched uranium is one in which

Percentage of U₂₃₅ has been artificially increased
Percentage of U₂₃₄ has been artificially increased
Percentage of U has been artificially increased
Extra energy is pumped from outside

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