The moderator used in fast breeder reactor is:

  1. Heavy water
  2. Graphite
  3. Ordinary water
  4. None of these

Answer (Detailed Solution Below)

Option 4 : None of these

Detailed Solution

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The plutonium-239 breeder reactor is commonly called a fast breeder reactor.

Sodium is used for cooling and heat transfer.

The fast breeder requires a higher enrichment of U-235 than a light-water reactor, typically 15 to 30%.

The reactor fuel is covered by non-fissionable U-238.

No moderator is used in the breeder reactor since fast neutrons are more efficient in transmuting U-238 to Pu-239.

Heavy water is used as a coolant to slow down the neutrons.

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