Power Plant Engineering
A nuclear reactor is said to be critical when the neutron population in the reactor core is

Rapidly increasing leading to the point of explosion
Decreasing from the specified value
Reduced to zero
Constant

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Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
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

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