Power Plant Engineering
In fast breeder reactors

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

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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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