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← ScienceWhich outcome occurs when a pressurized water reactor undergoes rapid boron dilution?
A)Increased delayed neutron population
B)Uncontrolled fission chain reaction✓
C)Stable power output is maintained
D)Reduced moderator temperature coefficient
💡 Explanation
Uncontrolled reaction occurs via increased neutron multiplication factor. Introducing un-borated water increases neutron availability because boron absorbs neutrons, therefore a rapid dilution initiates rapid reactivity insertion, rather than stable power as the control rods cannot compensate immediately.
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