Power Plant Engineering
U235 will undergo fission by

High energy (fast) neutrons alone
Medium energy neutrons
Either fast or slow neutrons
Low energy (slow) neutrons alone

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Power Plant Engineering
Enriched uranium is one in which

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

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Power Plant Engineering
A nuclear unit becoming critical means

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

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