A) Sodium
B) Helium
C) Mercury
D) Water
Correct Answer: D
Solution :
In majority of commercial nuclear power plants Carbon Di-Oxide is used as Coolant to Cool the reactor Core. Once it has picked up enough heal from the reactor, the coolant (i.e.\[C{{O}_{2}}\]) itself needs to be cooled. This is the job of secondary cooling system known as the steam circuit, where water is used as coolant.
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