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Which constraint requires pulsed operation of fusion-fission hybrid reactors?

A)Fuel breeding blankets overheat rapidly
B)Neutron activation degrades structural materials
C)Plasma instability collapses the confinement
D)Tritium diffusion increases at steady-state

💡 Explanation

Overheating requires pulsed operation because during fission, radiative capture drives significantly higher power deposition on the blanket, exceeding cooling capacity and melting the material; therefore pulsed operation is needed, rather than risking a runaway fission reaction which steady fuel flow minimizes.

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