Obninsk

Russia / Kaluga / Obninsk /
 city, second-level administrative division
Obninsk is a city in Kaluga Region of Russia. It is one of the major Russian science cities. The first nuclear reactor in the world for the large scale production of electricity opened here on June 27, 1954, and also doubled as a training base for the crew of the Soviet Union's first nuclear submarine, the Leninsky Komsomol, or K-3. Now the city is home to twelve scientific research institutes. The city is easily accessible by train from Kievsky train station in Moscow.
Wikipedia article: http://en.wikipedia.org/wiki/Obninsk
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Coordinates:   55°5'56"N   36°36'6"E