[piytar]

Um, nickel is the fifth most common element on Earth after iron, oxygen, silicon and magnesium. Granted, a lot of it is pretty deep down, but it is nowhere near rare...

[GraceG]

[ Um, nickel is the fifth most common element on Earth after iron, oxygen, silicon and magnesium. Granted, a lot of it is pretty deep down, but it is nowhere near rare... ]

I was thinking of copper, but this will create copper in the used fuel elements.

So win-win.