The fast breeder reactor uses the following moderator

A. Demineralised water

B. Carbon dioxide

C. Heavy water

D. No moderator is used

Answer: Option D

Solution(By Examveda Team)

No moderator is used in the breeder reactor since fast neutrons are more efficient in transmuting U238 to Pu239. At this concentration of U235, the cross-section for fission with fast neutrons is sufficient to sustain the chain-reaction.

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