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← ScienceWhich outcome results when Xe-135 accumulates within a nuclear reactor core?
A)Fission chain reaction decelerates locally✓
B)Criticality accelerates uncontrollably in regions
C)Fuel efficiency increases significantly
D)Coolant boiling point increases rapidly
💡 Explanation
Xe-135 accumulation causes neutron absorption, called neutron poisoning, reducing neutron flux and slowing down fission rate because Xe-135 has a high neutron capture cross-section; therefore, the chain reaction decelerates rather than accelerates because Xe-135 removes available neutrons.
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