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← ScienceWhich outcome results when a power plant control rod malfunctions?
A)Uncontrolled chain nuclear reaction occurs✓
B)Moderator material rapidly degrades structure
C)Coolant experiences phase transition blockage
D)Generator experiences rotor harmonic oscillations
💡 Explanation
Runaway fission occurs because the control rod normally maintains neutron flux. This **neutron absorption** process prevents uncontrolled chain reactions; therefore a runaway reaction happens, rather than other thermal or mechanical failures under normal control.
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