Ukraine. Province of Kiev. Chernobyl. Chernobyl atomic power station. Nuclear power plant. 20 years after the catastrophe which took place on april 1986 at 1.23 am with the explosion of reactor No 4. It was the world's worst nuclear power accident. Model of the Reactor No 4 at the time of the explosion and after the construction of walls of concrete and steels six metres thick. It is now called the sarcophagus. The sarcophagus is a shelter for radioactive waste. The swiss, english and american flags are a memory of the donors who contribute to the safety developments of Chernobyl atomic power station. © 2006 Didier Ruef