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← ScienceWhich instability causes reactor failure during xenon poisoning?
A)Oscillating neutron flux production✓
B)Uncontrolled fuel rod expansion
C)Moderator boiling point decrease
D)Reduced coolant thermal conductivity
💡 Explanation
Oscillating neutron flux results from iodine-135 decaying into xenon-135, which strongly absorbs neutrons initiating neutron flux oscillations. This is because Xe-135 absorbs neutrons enhancing fission causing a temporary power increase, therefore flux varies spatially leading to instability and failure, rather than other temperature related mechanisms.
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