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← ScienceWhich outcome occurs when Europium-155 accumulates in a nuclear fuel rod?
A)Increased neutron radiative capture✓
B)Enhanced uranium fission cross-section
C)Reduced control rod effectiveness
D)Elevated moderator coolant corrosivity
💡 Explanation
Increased Europium-155 increases neutron absorption because neutron radiative capture (a form of nuclear fission) reduces the availability of neutrons to propagate the fission chain reaction within Uranium-235. Therefore, reactivity decreases, rather than an increase in fission occurring for the Uranium.
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