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

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

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be capable of attaining high temperature, only when it is pressurised
Have high density, but low heat transfer co-efficient
Be a good absorber of neutrons
Be free from radiation damage and non-corrosive

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