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

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

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Nuclear Power Engineering
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Achieving high degree of superheat in the steam
Lowering the coolant circulation pressure
Faster heat removal rate from the core

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