There was no radiation leak after a fire broke out aboard an atomic-powered icebreaker in Siberian waters, Russian authorities have said.

Two crewmen died in the fire and a third man suffered from smoke inhalation on the icebreaker Vaygach.

The vessel was near the mouth of the Yenisei river close to Russia's northern coast on the Kara Sea, the regional branch of the Emergency Situations Ministry said.

The blaze was extinguished two-and-a-half hours after it started in living quarters aboard the ship, and there was no threat of a radiation leak, the ministry said.

The icebreaker, built in 1990, had left the Yenisei port of Dudinka, 2,800km northeast of Moscow, and was en route to Murmansk on the Barents Sea when the fire occurred.