Karabash Nuclear Storage Facility aks Chelyabinsk-115

"....In the early 1950s there were so many occurrences of death and disease from the nuclear waste dumping in the Techa river that 22 villages along the river banks in a 50 kilometers zone downstream from Mayak were evacuated. In 1957, a nuclear waste storage tank accident released radiation double the amount released by the Chernobyl accident."