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← ScienceIn a pressurized water reactor (PWR), which consequence occurs when control rods fully withdraw?
A)Increased neutron flux across fuel✓
B)Moderator reactivity coefficient becomes negative
C)Xenon-135 concentration rapidly increases
D)Fuel cladding critical heat flux increases
💡 Explanation
Increased neutron population results when control rods withdraw, because the neutron absorption rate decreases; this initiates sustained nuclear fission. Therefore, the neutron flux increases across the reactor core, rather than changes Xe-135 poisoning profiles or affects heat transfer limits directly.
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