Power Plant Engineering
The size of the reactor is said to be critical when

It produces no power
Chain reaction can be initiated
It explodes
It becomes uncontrollable

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

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