Power Plant Engineering
Breeder reactors employ liquid metal coolant because it

Produces maximum steam
Breeds neutrons
Acts as good moderator
Transfers heat from core at a fast rate

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

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

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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 capable of generating much more than rated capacity
It is generating power to rated capacity

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