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The fast breeder reactor uses the following moderator

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Power Plant Engineering
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The fast breeder reactor uses the following moderator

Answer & Solution
Correct Answer: Option D
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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