Power Plant Engineering
The secondary fuel used in nuclear power plants is

U₂₃₃ and Pu₂₃₈
U₂₃₅ and Th₂₃₂
U₂₃₅ and Pu₂₃₈
U₂₃₃ and Pu₂₃₉

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

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