Power Plant Engineering
A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

Extracts heat from nuclear reaction
Reduce the temperature
Slow down the speed of fast moving neutrons
Control the reaction

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

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

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Power Plant Engineering
A nuclear unit becoming critical means

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

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