Power Plant Engineering
fission chain reaction in uranium can be developed by

Accelerating fast neutrons
Using moderator
Absorbing all neutrons
Slowing down fast neutrons so that Uz fission continues by slow motion neutrons

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Power Plant Engineering
A nuclear unit becoming critical means

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
It is capable of generating much more than rated capacity

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