Nuclear Power Engineering
A boiling water reactor is the one, in which the

Fuel and the coolant are thoroughly mixed to form a homogeneous solution
Pressurised water is pumped into the core
Coolant water, after being heated in the reactor core, generates steam in a boiler
Coolant water is allowed to boil in the core of the reactor

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

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
None of these
Is not at all corrosive, even at a higher temperature

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