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

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

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

It is difficult to control fusion reaction
It is difficult to initiate fusion reaction
Quantity of fuel required for initiating fusion reaction is prohibitively high
The fuel required (e.g. deuterium and tritium) is scarce

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