Power Plant Engineering
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

All of the listed here
Stable under nuclear radiation
Corrosion resistant
Good thermal conductor

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

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Power Plant Engineering
A nuclear unit becoming critical means

It is capable of generating much more than rated capacity
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

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