Nuclear Power Engineering
Molten sodium is used as a coolant in a fast breeder reactor, because of its

Capability to increase the reaction rate in the core
Neutron breeding capability
Faster heat removal capability from the core
Excellent moderating properties

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

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