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← ScienceWhich risk increases when a pressurized heavy water reactor (PHWR) uses improperly purified heavy water?
A)Incomplete moderator neutron thermalization
B)Runaway chain reaction criticality
C)Increased tritium production within coolant
D)Enhanced corrosion of zircaloy cladding✓
💡 Explanation
Enhanced corrosion occurs because light water contamination causes isotopic exchange via the Arrhenius effect increasing H+ concentration and redox reactions. Therefore degradation increases, rather than a purely nuclear accident risk, because light water acts as corrosion initiator.
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