Nuclear Power Engineering
Heavy water is used as a moderator in a

Boiling water reactor (BWR)
Candu reactor
Pressurised water reactor (PWR)
Molten sodium cooled reactor

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

Is not at all corrosive, even at a higher temperature
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
None of these
Can't attain high temperature at normal pressure

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