Report on TVA fly ash spill released

Filed June 30th, 2009 joshua

Tennessee Valley Authority officials tried to provide answers last week to a report explaining why a coal fly ash retention pond at one of its coal-fired power plants failed.

The fly ash spill at a Kingston, Tenn., TVA facility sent millions of gallons of toxic fly ash slurry into two nearby rivers and into a nearby community.

According to a report released last week, one of the main reasons why the retention pond failed was an undetected layer of unstable ash sludge. The layer remained undetected for decades and was about 6 inches thick.

TVA appears on-the-hook for several other leading contributors to the fly ash spill last December: the construction of retaining walls on the top of the ash, the saturation of stored ash and the pressure exerted by existing stacks at the Kingston power plant.

Internal wall failures in the retention pond eventually made their way to the external wall, leading to the failure.

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