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← ScienceWhich risk increases in a pressurized water reactor if boron concentration decreases?
A)Uncontrolled chain reaction criticality✓
B)Fuel rod cladding oxidation rate
C)Steam generator tube ruptures
D)Spent fuel pool water radiopacity
💡 Explanation
Loss of boron reduces neutron absorption, thus promoting nuclear chain reaction because the neutron moderation decreases, causing increased probability that fission increases in fuel; therefore, an uncontrolled reaction is more likely, rather than core overheating with intact control.
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