''Lenin'' (russian: Ленин) was a

Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nation ...

nuclear-powered icebreaker A nuclear-powered icebreaker is an icebreaker with an onboard nuclear power plant that produces power for the vessel's propulsion system. , Russia is the only country that builds and operates nuclear-powered icebreakers, having built a number of ...

, the first nuclear-powered icebreaker in the world. Launched in 1957, it was both the world's first

nuclear-powered Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced b ...

surface ship and the first nuclear-powered civilian vessel. ''Lenin'' entered operation in 1959 and worked clearing sea routes for cargo ships along Russia's northern coast. From 1960 to 1965 the ship covered over during the Arctic navigation season, of which almost was through ice. Nuclear power proved to be an ideal technology for a vessel working in such a remote area as it removed the need for regular replenishment of fuel. On 10 April 1974 the vessel was awarded the

Order of Lenin The Order of Lenin (russian: Орден Ленина, Orden Lenina, ), named after the leader of the Russian October Revolution, was established by the Central Executive Committee on April 6, 1930. The order was the highest civilian decoration ...

. It was officially decommissioned in 1989. It was subsequently converted to a museum ship and is now permanently based at

Murmansk Murmansk (Russian: ''Мурманск'' lit. "Norwegian coast"; Finnish: ''Murmansk'', sometimes ''Muurmanski'', previously ''Muurmanni''; Norwegian: ''Norskekysten;'' Northern Sámi: ''Murmánska;'' Kildin Sámi: ''Мурман ланнҍ'') ...

Propulsion

When launched in 1957, ''Lenin'' was powered by three OK-150 reactors. In its late-1960s configuration, at full capacity the ship used five to six pounds of

uranium-235 Uranium-235 (235U or U-235) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a nuclear chain reaction. It is the only fissile isotope that exi ...

per 100 days. In the configuration employed from 1970, two OK-900 reactors provided steam for four steam turbines, that were in turn connected to generators, which powered three sets of

electric motor An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate for ...

s to drive the ship's three propellers.

Nuclear accidents

In February 1965, there was a

loss-of-coolant accident A loss-of-coolant accident (LOCA) is a mode of failure for a nuclear reactor; if not managed effectively, the results of a LOCA could result in reactor core damage. Each nuclear plant's emergency core cooling system (ECCS) exists specifically t ...

. After being shut down for refueling, the coolant was removed from the number two reactor before the

spent fuel Spent nuclear fuel, occasionally called used nuclear fuel, is nuclear fuel that has been irradiated in a nuclear reactor (usually at a nuclear power plant). It is no longer useful in sustaining a nuclear reaction in an ordinary thermal reactor a ...

had been removed. As a result, some of the fuel elements melted and deformed inside the reactor. When the spent elements were being unloaded for storage and disposal, it was found that 124 fuel assemblies (about 60% of the total) were stuck in the reactor core. It was decided to remove the fuel, control grid, and control rods as a unit for disposal; they were placed in a special cask, solidified, stored for two years, and dumped in Tsivolki Bay (near the Novaya Zemlya archipelago) in 1967. The second accident was a cooling system leak which occurred in 1967, shortly after refueling. Finding the leak required breaking through the concrete and metal biological shield with sledgehammers. Once the leak was found, it became apparent that the sledgehammer damage could not be repaired; subsequently, all three reactors were removed by blowing them off the ship with shaped charges above a burial site off Novaya Zemlya, and replaced by two OK-900 reactors. This was completed in early 1970.

Retirement

''Lenin'' was decommissioned in 1989, because its hull had worn thin from ice friction. She was laid up at

Atomflot FSUE Atomflot (russian: ФГУП «Атомфлот») is a Russian company and service base that maintains the world's only fleet of nuclear-powered icebreakers. Atomflot is part of the Rosatom group, and is based in the city of Murmansk. , the ...

, a base for nuclear icebreakers in

, and repair and conversion into a museum ship was completed in 2005.

References

External links

NKS Evaluation of Russian Marine Nuclear Reactors

Bellona Foundation Article on Icebreaker ''Lenin''
* Critical article on ''Lenin'' Icebreaker * {{Nuclear surface ships

Lenin Vladimir Ilyich Ulyanov. ( 1870 – 21 January 1924), better known as Vladimir Lenin,. was a Russian revolutionary, politician, and political theorist. He served as the first and founding head of government of Soviet Russia from 1917 to 1 ...

Icebreaker Lenin Nuclear accidents and incidents 1957 ships Cultural heritage monuments in Murmansk Oblast Objects of cultural heritage of Russia of federal significance