The regulations concerning entry to and residence in Svalbard are different from the regulations on the Norwegian mainland. Although the Norwegian mainland is part of the Schengen area, Svalbard is not, and due to this fact, a passport control is required of all foreign visitors visiting Svalbard. You can read more about the rules and regulations for passport and visa here: http://www.sysselmannen.no/en/Visitors/Entry-and-residence/