Nuclear Power Engineering
Uranium is recovered from its ore (pitchblende) by

Dissolving in water
Smelting in a furnace
Leaching with sulphuric acid
Froth floatation technique

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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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Nuclear Power Engineering
In a pressurised water reactor (PWR), the

Coolant water is pressurised to prevent bulk boiling of water in the core
Use of moderator is not required
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water boils in the core of the reactor

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