Question

$D_{2}O$ or graphite is a moderator in nuclear reactor.

• A. True
• B. False

Answer 1

The correct option is A True

A variety of substances, including light water, heavy water, graphite, air, carbon dioxide, helium, liquid sodium, liquid sodium-potassium alloy, and hydrocarbons (oils), have been used as coolants. Such substances are, in general, good conductors of heat, and they serve to carry the thermal energy produced by fission from the fuel and through the integral system.