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

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

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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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