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  1. The fast breeder reactor uses the following moderator

    2. A.

     Demineralised water
    B.

     Carbon dioxide
    C.

     Heavy water
    D.

     No moderator is used

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    Answer : Option D

    Explanation :

    No moderator is used in the breeder reactor since fast neutrons are more efficient in transmuting U-238 to Pu-239. At this concentration of U-235, the cross-section for fission with fast neutrons is sufficient to sustain the chain-reaction.

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