Udachny
| Udachny (English) Удачный (Russian) Удачнай (Yakut) |
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| - Town - Town under district jurisdiction |
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 View of Udachny |
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_Republic_(2008-03).svg) Location of the Sakha (Yakutia) Republic in Russia |
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 Udachny
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| Administrative status (as of June 2009) | |
| Country | Russia |
| Federal subject | Sakha Republic |
| Administrative district | Mirninsky District |
| Town | Udachny |
| Administrative center of | Town of Udachny |
| Municipal status (as of April 2012) | |
| Municipal district | Mirninsky Municipal District |
| Urban settlement | Udachny Urban Settlement |
| Administrative center of | Udachny Urban Settlement |
| Head | Artur Prikhodko |
| Statistics | |
| Population (2010 Census) | 12,613 inhabitants |
| Time zone | YAKT (UTC+09:00) |
| Founded | 1968 |
| Town status since | 1987 |
| Postal code(s) | 678188 |
| Dialing code(s) | +7 41136 |
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| 2010 Census | 12,613 |
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| 2002 Census | 15,698 |
| 1989 Census | 19,603 |
| 1979 Census | 11,604 |
Udachny (Russian: Удачный; IPA: [ʊˈdatɕnɨj], lit. successful or lucky; Yakut: Удачнай, Udacnay) is a town in Mirninsky District of the Sakha Republic, Russia, located on the Markha River, 508 kilometers (316 mi) from Mirny, the administrative center of the district. As of the 2010 Census, its population was 12,613.
The Udachnaya pipe diamond deposit was discovered in 1955. Due to its isolated location, it was not exploited until the 1960s. In conjunction with the beginnings of diamond production, the urban-type settlement of Udachny was founded in 1968; town status was granted to it in 1987.
As part of a plan to create the basin for a tailings dam for the nearby diamond mine, a 1.7 kiloton atomic bomb was detonated 98 meters (322 ft) underground near Udachny on October 2, 1974. Original plans had called for eight similar explosions to be conducted; however, due to radioactive fallout being far greater than expected, the project was halted after the first blast. The shaft in which the explosion was held was not plugged until eighteen years later, with an estimated 7-to-20-meter (23 to 66 ft) thick concrete sarcophagus.
As an inhabited locality, Udachny is classified as a town under district jurisdiction. Within the framework of administrative divisions, it is, together with one rural locality (the selo of Polyarny), incorporated within Mirninsky District as the Town of Udachny. As a municipal division, the Town of Udachny is incorporated within Mirninsky Municipal District as Udachny Urban Settlement.
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