Power Plant Engineering
In fast breeder reactors

Graphite is used as the moderator
Any type of moderator can be used
Moderator is dispensed with
Heavy water is used as the moderator

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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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