Power Plant Engineering
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

No moderator is needed
Graphite
Heavy water
Carbon dioxide

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

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

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