Power Plant Engineering
A nuclear unit becoming critical means

There is danger of nuclear spread
It is generating power to rated capacity
It is capable of generating much more than rated capacity
Chain reaction that causes automatic splitting of the fuel nuclei has been established

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

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
To Supply high pressure steam

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