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← ScienceWhich outcome occurs when a pressurized water reactor’s (PWR) spent nuclear fuel rods experience prolonged alpha decay?
A)Increased helium gas concentration✓
B)Elevated core coolant temperature
C)Reduced neutron moderation efficiency
D)Decreased gamma radiation shielding
💡 Explanation
Alpha decay releases helium nuclei. Because alpha decay proceeds, helium gas accumulates within the fuel rods' cladding, increasing the internal pressure within each fuel rod. This result stems from radioactive decay, therefore increased helium, rather than affecting temperature or shielding
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