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

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

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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
Pressurised water is pumped into the core
Coolant water is allowed to boil in the core of the reactor

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

Is a better neutron moderator as well
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
All of these

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