Power Plant Engineering
Amongst the following, the fissionable materials are

U₂₃₁ and Pu₂₃₃
U₂₃₅ and Pu₂₃₅
U₂₃₈ and Pu₂₃₉
U₂₃₃ and Pu₂₂₉

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Power Plant Engineering
A nuclear unit becoming critical means

It is generating power to rated capacity
Chain reaction that causes automatic splitting of the fuel nuclei has been established
It is capable of generating much more than rated capacity
There is danger of nuclear spread

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