Seversk (, ) is a
closed city in
Tomsk Oblast,
Russia
Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
, located northwest of
Tomsk on the right bank of the
Tom River. The population was 108,590 at the 2010 census and 109,106 at the 2002 census.
It was previously known as ''Pyaty Pochtovy'' (until 1949) and ''Tomsk-7'' (until 1992).
Geography
The city is located northwest of Tomsk on the right bank of the
Tom River.
Climate
Seversk has a
humid continental climate
A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers, and cold ...
(
Köppen climate classification
The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...
''Dfb'') with warm summer. The annual average temperature is . The average temperature in January is between . The average temperature in July is . The total annual rainfall is .
History
Founded in 1949, it was known as Pyaty Pochtovy (, lit. ''the Fifth Postal'') until 1954 and as Tomsk-7 () until 1992. City status was granted to it in 1956.
Administrative and municipal status
Within the
framework of administrative divisions, it is, together with five
rural localities, incorporated as Seversk
City Under Oblast Jurisdiction—an administrative unit with the status equal to that of the
districts.
[Law #271-OZ] As a
municipal division, Seversk City Under Oblast Jurisdiction is incorporated as Seversk Urban Okrug.
[Decision #69/1]
Economy
Seversk is the site of the
Siberian Chemical Combine, founded in 1954. It comprises several
nuclear reactor
A nuclear reactor is a device used to initiate and control a Nuclear fission, fission nuclear chain reaction. They are used for Nuclear power, commercial electricity, nuclear marine propulsion, marine propulsion, Weapons-grade plutonium, weapons ...
s and chemical plants for separation, enrichment, and reprocessing of
uranium
Uranium is a chemical element; it has chemical symbol, symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Ura ...
and
plutonium. Following an agreement in March 2003 between
Russia
Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
and the
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
to shut down Russia's three remaining plutonium-producing reactors, two of the three plutonium producing reactors (the two that are situated in Seversk, at the
Sibirskaya Nuclear Power Plant) were shut down.
Nuclear warheads are produced and stored on the premises. One of the most serious
nuclear accidents at SGCE occurred on April 6, 1993, when a tank containing a highly
radioactive solution exploded (see
§ Tomsk-7 explosion).
Government
The current Chair of the City
Duma and Mayor is Grigory Shamin, who has served since 2010. The current city manager is Anatoly Abramov, who has served since August 2007.
Secret city

Seversk had been a secret city in the
Soviet Union
The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
until President
Boris Yeltsin
Boris Nikolayevich Yeltsin (1 February 1931 – 23 April 2007) was a Soviet and Russian politician and statesman who served as President of Russia from 1991 to 1999. He was a member of the Communist Party of the Soviet Union (CPSU) from 1961 to ...
decreed in 1992 that such cities could use their historical names. The town had not been marked on the official maps until then. As was the tradition with Soviet towns containing secret facilities, the designation "Tomsk-7" (like its predecessor "Pyaty Pochtovy") is simply a
postal code
A postal code (also known locally in various English-speaking countries throughout the world as a postcode, post code, PIN or ZIP Code) is a series of letters or numerical digit, digits or both, sometimes including spaces or punctuation, inclu ...
which implies that the place is located close to the city of Tomsk.
For many years, residents have been restricted from entering or leaving the city. Upon leaving Seversk, residents had to surrender their special entry passes at the checkpoint and it was forbidden to discuss where they worked or lived. In 1987, some restrictions were lifted due to the large number of residents who worked or studied in Tomsk.
The city still remains closed to non-residents. There are six checkpoints where visitors must show entry documents. Permission to visit the city may only be granted by the appropriate authorities by a request of the institution being visited, or by a request of a private party such as a close relative. Visitors can apply for entry passes at the main checkpoint; prior to May 2007, they needed to visit a special office in Tomsk.
Tomsk-7 explosion
There was a
nuclear accident at the
Tomsk-7 Reprocessing Complex on April 6, 1993, when a tank exploded due to formation of
red oil, while
nitric acid
Nitric acid is an inorganic compound with the formula . It is a highly corrosive mineral acid. The compound is colorless, but samples tend to acquire a yellow cast over time due to decomposition into nitrogen oxide, oxides of nitrogen. Most com ...
was being added to a
plutonium-uranium mixture. The explosion had a force of approximately 100
kg of TNT and blew out a large section of the exterior wall of the high level radioactive processing room, releasing a cloud of radioactive gas. The cloud was dispersed northwards by the wind, with some of the radioactive material settling over the neighboring village of
Georgiyevka.
''TIME'' magazine has identified the Tomsk-7 explosion as one of the world's 10
"worst nuclear disasters". The
International Atomic Energy Agency considers the event a
Level 3 "serious incident".
Culture
Seversk has nine municipal cultural and artistic institutions, as well as four establishments of additional education for children of artistic and aesthetic focus. There is also a nonprofit organization, Ostrovsky House of Culture, and a cinema called Mir.
"Mir"
Education
There is a major post-secondary school in the city, the Seversk State Technological Academy, a branch of Moscow Engineering Physics Institute.
Notable people from Seversk
* Anastasia Shishmakova (born 2000), Russian group rhythmic gymnast.
* Margarita Aliychuk (born 1990), Russian group rhythmic gymnast and Olympic champion
* Lyubov Yegorova (born 1966), cross-country skier and Olympic champion
See also
* Kyshtym disaster
* List of closed cities
References
Notes
Sources
*
*
External links
Official website of Seversk
Photo album of Seversk
Official website of the Siberian Group of Chemical Enterprises
Newspaper Novyj Dialog
{{Authority control
Cities and towns built in the Soviet Union
Cities and towns in Tomsk Oblast
Closed cities
Naukograds
Radiation accidents and incidents
Populated places established in 1949
Socialist planned cities