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← ScienceWhich risk increases sharply when neutron moderators are lost in a nuclear reactor core during fission?
A)Fuel cladding overheat and breach✓
B)Control rod insertion failure rate
C)Containment vessel pressure reduces
D)Coolant pump cavitation margins widen
💡 Explanation
Fuel overheat risk increases due to decreased control of the **neutron flux**, because the rate of collisions declines drastically, driving up the number of neutrons absorbed by the uranium directly therefore escalating the production of heat, rather than a controlled fission which can continue safely in stable and cooled conditions.
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