Power Plant Engineering
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

High neutron scatter cross-section
Low moderating efficiency
High neutron absorption cross-section
Low neutron absorption cross-section

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

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

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