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Which outcome ultimately dominates after sustained Uranium-235 fission within reactor fuel rods?

A)Increased neutron absorption cross-section
B)Fuel rod tensile strength increases
C)Moderator neutron reflection decreases
D)Coolant undergoes phase transition change

💡 Explanation

Fission fragments accumulate, resulting in fission product poisoning via neutron absorption. This is because **neutron capture** reactions increase, therefore reactor criticality reduces at the atomic scale, rather than structural enhancements, neutron reflection changes, or simpler coolant boiling phenomena.

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