Q.

In nuclear reactor, heavy water is used as –

A. coolant
B. fuel
C. moderator
D. atomic smasher
Answer» C. moderator
Explanation: Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
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