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← ScienceWhich outcome occurs when a nuclear reactor's coolant flow decreases too rapidly?
A)Doppler broadening reduces neutron cross-section
B)Moderator effectiveness increases chain reaction
C)Fuel temperature increases, reactivity increases✓
D)Control rods eject, halting chain reaction
💡 Explanation
Fuel temperature increases, because reduced heat removal leads to higher kinetic energy in fuel. Therefore, neutron capture probability increases, increasing reactivity via Doppler effect, rather than reactivity naturally reducing. Temperature rise is dominant.
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