Nuclear Power Engineering
Ordinary water is not used as a moderator because, it

Does not absorb neutrons
Has a low scattering cross-section
Absorbs neutrons
Has a low absorption cross-section

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

Coolant water is allowed to boil in the core of the reactor
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

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