Power Plant Engineering
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

High neutron absorption cross-section
Low neutron absorption cross-section
Low moderating efficiency
High neutron scatter cross-section

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Power Plant Engineering
In natural uranium, the constituents of three naturally occurring isotopes are

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

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