I work for a company that provides electronics that end up in nuclear reactors. We don't do batteries, the story is just an example of the kind of headache it is.
Maybe it's true for the actual reactor control system I dunno. Our industrial phones ended up at a nuclear plant once (that we know of) and we only learned about it because the engineer called us for firmware reset procedure. The product doesn't have any nuclear energy certifications (although it is tested for rail and maritime use).
