Power Plant Engineering
A nuclear reactor is said to be critical when the neutron population in the reactor core is

Decreasing from the specified value
Constant
Rapidly increasing leading to the point of explosion
Reduced to zero

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Power Plant Engineering
A nuclear unit becoming critical means

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

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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 provide sub cooled water at high pressure
To increase pressure of water in primary circuit

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