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

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

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Power Plant Engineering
Enriched uranium is one in which

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

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Power Plant Engineering
A nuclear unit becoming critical means

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

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