( CNN ) A nuclear submarine being repaired at a Russian shipyard has caught on fire , according to a law enforcement source speaking to Russia 's state-run news agency ITAR-Tass . `` The submarine is in a dry dock , '' Tass reports , citing the source , and there is no ammunition on board . `` The rubber insulation between the submarine 's light and pressure hull is on fire , '' Tass reported . Russia 's RIA Novosti news agency says insulation caught on fire as welding work was being done on the submarine . Tass reported that the fire began on a sub in the Zvyozdochka shipyard in northwestern Russia . Zvyozdochka spokesman Yevgeny Gladyshev told the news agency that the sub had been undergoing repairs since November 2013 . `` Nuclear fuel from the sub 's reactor has been unloaded , '' he reportedly said . `` There are no armaments or chemically active , dangerous substances , fissionable materials on it , '' Gladyshev said to Tass . `` The enterprise 's personnel left the premises when the submarine caught fire , no one has been injured . The fire presents no threat to people and the shipyard . ''
Submarine is in Zvyozdochka shipyard , in northwestern Russia . No `` dangerous '' substances on the submarine , shipyard spokesman told Tass .