MOSCOW (Reuters) -Russia said on Monday that emergency workers had put out a fire on a Soviet-era nuclear-powered cargo-icebreaker ship and the state company which runs the vessel said there had been no casualties and no threat to the security of the reactor. The fire broke out on Sunday in one of the cabins of the Soviet-made Sevmorput ship, which is currently at dock in the northern Russian city of Murmansk, the emergency ministry said. The fire, which at its peak covered an area of about 30 square meters (323 square feet), was put out with no casualties, the ministry said. “The fire was qui…