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← ScienceWhich outcome results when cadmium control rods slowly degrade within a nuclear reactor core?
A)Increased neutron moderation over time
B)Decreased reactor criticality margin slowly✓
C)Reduced coolant flow within the core
D)Elevated gamma radiation near turbine halls
💡 Explanation
Reduced neutron absorption occurs, because gradual material loss drives decreased **neutron flux damping**, which then makes maintaining sufficient shutdown margin challenging; therefore criticality risks will increase rather than coolant or gamma increase, which are related but separate effects.
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