If you are talking about the material inside which the nuclear fuel is sealed, zircaloy is about the most common. This alloy, which is available in several "flavors" including Zirc-1, Zirc-2 and...
I really want to write everything I know but I'm just too lazy to do that :P sooo follow this link: http://www.revision-notes.co.uk/revision/653.html good luck :)
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