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← ScienceWhich outcome occurs when control rods fail to fully insert within a nuclear reactor core?
A)Uncontrolled nuclear chain reaction occurs✓
B)Coolant boiling point greatly decreases
C)Radiation shielding effectiveness grows
D)Moderator density uniformly increases
💡 Explanation
An uncontrolled chain reaction occurs because the control rods mediate neutron absorption; therefore, without sufficient neutron absorption, critical mass is reached, causing an exponential surge in fissions, rather than a stable or declining reaction rate.
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