According to the official site of the Ter regional administration with the center in Umba, the village itself is off limit to foreigners. If you have to travel there you need to submit an application (forms available at the Migration Services, Umba Department of the Internal Affairs, ul. Dzherzhinskogo 65, tel. (81559) 5-15-79) at least 45 days before your trip, to the Federal Security Services (183752 Murmansk, ul. Lenina 64, tel. (8152) 45-40-76, firstname.lastname@example.org). The latter is supposed to send you your permits no later than 5 days before your trip.
The above info has not been confirmed via live humans, so take it with some healthy skepticism. We should be meeting people from Umba who are in the know at the Rock Flower event in Apatity on Feb. 11 and will ask for details.