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← ScienceWhich consequence results when a coolant failure arrests moderation during uranium fission?
A)Chain reaction event accelerates uncontrollably
B)Tritium production sharply increases
C)Control rods fail to respond
D)Neutron flux within the core diminishes✓
💡 Explanation
Neutron moderation requires slow neutrons to sustain fission; loss of coolant causes hard spectrum transition. Because criticality depends on **neutron thermalization**, the uranium fuel reactivity drops sharply; therefore the chain reaction decays, rather than accelerates with control rod failure.
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