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
Corrosion resistant
Good thermal conductor

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Power Plant Engineering
A nuclear unit becoming critical means

It is generating power to rated capacity
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

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Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄

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