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← ScienceWhich outcome rapidly occurs when reactor-grade uranium exceeds criticality?
A)Uncontrolled chain reaction starts✓
B)Moderator efficiency degrades markedly
C)Fuel-cladding experiences progressive corrosion
D)Coolant undergoes immediate phase transition
💡 Explanation
An escalating, or 'runaway', fission chain reaction occurs because neutron production from uranium isotopes rises exponentially driving further fission events via neutron multiplication, therefore a rapid energy release occurs rather than gradual damage or phase transitions.
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