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

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

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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
It is capable of generating much more than rated capacity
It is generating power to rated capacity
There is danger of nuclear spread

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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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