What is the function of a moderator? - Basic Mechanical Engineering

Q.  What is the function of a moderator?
- Published on 02 Sep 15

a. Increases the speed of neutrons
b. Increases the speed of electrons
c. Reduces the speed of neutrons
d. Reduces the speed of electrons

ANSWER: Reduces the speed of neutrons


  • asha   -Posted on 24 Feb 20
    it is not good
  • Sravanthi    -Posted on 12 Nov 15
    - Nuclear power plants utilize energy which is produced by fission in nuclear reactions for the purpose of producing steam.

    - These plants consists of following parts,

    1) Moderator: Fast moving neutrons are produced due to fission of of fuel. These neutrons can be slowed down by moderators to right speed. This increases effectiveness of fission, of the fuel material. This neutron kinetic energy is reduced by transferring the energy to the moderator.

    - The collisions become elastic when the energy of neutron is lowered, which means the total kinetic energy and momentum of neutron and the nucleus is conserved. Moderators do not absorb neutrons but just reduce the speed of neutrons.

    Carbon, heavy water and Peryllium are the materials used for moderators.

    2) Control rods: These adjustable control rods made from materials like cadmium or boron control energy released by chain reaction. These rods control the energy released by absorbing the neutrons.

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