September 19, 2007

Type A Accident Investigation Board Report of the July 27, 2007 Tank 241-S-102 Waste Spill at the Hanford Tank Farm 

On July 27, 2007, there was a spill of highly radioactive mixed waste from the S-102 Tank waste retrieval pumping system. The cause of the accident was an overpressure of a hose in the dilution line. Although required by the Documented Safety Analysis, the dilution line did not have a backflow device to protect the hose from overpressure.