Power Plant Engineering
A nuclear unit becoming critical means

There is danger of nuclear spread
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

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Power Plant Engineering
Natural uranium is made up of

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

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Power Plant Engineering
In nuclear fission

The original elements change into completely different elements
The molecules rearrange themselves to form other molecules
None of the listed here
The electrons of the element change

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