Chernobyl was a nuclear power plant and neighbouring city in Ukraine, then part of the Soviet Union.
The plant was notorious for undergoing a meltdown on 26 April 1986 which rendered the entire region uninhabitable. (COMIC: Black Destiny, AUDIO: Power Play) 40,000 people died of cancer as a result of the disaster. (PROSE: Iceberg)
In 2007, agents of the Three Families dropped an abducted Jack Harkness onto the grounds of the plant from a plane, after they had confirmed his ability to heal. (WC: Web of Lies)
In 1996, Chad Vandemeer used the GCI processor to create the Through the Eye of Eternity episode "There's No Ball Like Cher-No-Ball". (PROSE: The Book of the War)
On Kirith, the Seventh Doctor detected "chernobyls" of artron energy on Kandasi Island. (PROSE: Timewyrm: Apocalypse)