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The Leningrad Nuclear Power Plant is situated in the closed town of Sosnovy Bor, 80 kilometres west of St. Petersburg. The plant consists of four graphite-moderated reactors of the RBMK-1000 type (Chernobyl-type). The reactors were put in operation between 1974 and 1981. The oldest reactor received a 15 year prolongation its engineered life span in 2004.