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Which instability develops if a nuclear reactor's coolant flow decreases?

A)Neutron flux oscillations accentuate rapidly
B)Control rods become less effective
C)Fuel pellet thermal conductivity increases
D)Delayed neutron fraction stabilizes reactivity

💡 Explanation

Reduced coolant leads to higher fuel temperatures, which lowers the density, resulting in reduced neutron absorption via thermal expansion, because the moderator effectiveness declines. Therefore, reactivity rises triggering increasingly violent power oscillations from more fission events; rather than stabilization because heat-induced changes prevent equilibrium.

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