Power Plant Engineering
Moderator in nuclear plants is used to

Extract heat from nuclear reaction
Cause collision with the fast moving neutrons to reduce their speed
Control the reaction
Reduce temperature

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Power Plant Engineering
A pressurized water reactor employs pressurizes for the following application

To provide sub cooled water at high pressure
To maintain constant pressure in primary circuit under varying load
To increase pressure of water in primary circuit
To Supply high pressure steam

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