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Which outcome results when operating a subcritical nuclear reactor?

A)Neutron population decays exponentially
B)Produces sustained controlled chain reaction
C)Continuous increase in power output
D)Achieves immediate criticality spontaneously

💡 Explanation

Neutron population decays because sustained fission requires criticality; the neutron multiplication factor must be less than one causing exponential decay rather than a chain reaction. Therefore, the reaction dies out, rather than being sustained, because it is below the critical threshold.

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