Power Plant Engineering
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

Good thermal conductor
Corrosion resistant
All of the listed here
Stable under nuclear radiation

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

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