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A moderator in Nuclear reactor

The moderator helps slow down the neutrons produced by fission to sustain the chain reaction. A moderator in a Nuclear reactor does not absorb neutrons but slows down the neutrons as early as possible.

Desirable properties of moderator 

  • It should have high thermal conductivity as heat transfer requires between neutron and moderator at a very high rate.
  • It should be chemically stable and should not decompose due to nuclear radiation.
  • It should not absorb neutrons but slow down the neutrons as early as possible.
  • It should have high resistance to corrosion as it has to work under high pressure and temperature.