Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄

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Power Plant Engineering
A nuclear unit becoming critical means

It is generating power to rated capacity
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

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Power Plant Engineering
Ferrite material is

The basic fuel for nuclear paints
The most fissionable material
The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
Basic raw material for nuclear plants

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