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← ScienceWhich disruptive outcome during a rapid nuclear reactor SCRAM event results when control rods fail and fuel geometry is altered?
A)Delayed neutron super-criticality develops locally✓
B)Radiation shielding degrades asynchronously over time
C)Xenon-135 poisoning accelerates fission rates
D)Moderator density shifts profile neutron energies
💡 Explanation
Delayed neutrons cause super-criticality because of uncontrolled positive reactivity insertion; the uncontrolled fission occurs because fuel pellet relocation has occurred, therefore excess power is produced rather than steady-state, because redistribution creates reactivity pockets.
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