@DiapDealer...The link for the Nook image requirements is here - in the
Ebook Cover Size and File Formats section:
B&N eBook Cover Requirements
You can see that all the ebook vendors in the list -- including Kobo, Kindle, iBooks, Nook, Smashwords, Google Books, Lulu, Draft2Digital and BookBaby do not use SVG for their ebook covers. These vendors either recommend JPEG + Tiff or JPG + PNG. But none of them use or recommend SVG format.