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TVA issued a preliminary report on the Sept. 18 incident that concludes that most of the material was coal fly ash and particles were not small enough to be breathable.
TVA said it has cleaned the smokestack and duct work involved in the release and may start up at least two electric generating units next week in a return to normal plant operations.
The preliminary information is part of a root-cause analysis TVA is conducting. A full report is expected within seven to 10 days, according to a press release.
According to its analysis, the material released during the incident was 75 percent coal ash, about 23 percent sulfate compounds and rest was other components found in natural coal. Sulfate typically exists in the smokestacks as sulfur dioxide gas, but had condensed into a solid due to cooler temperatures in stack one, the stack involved in the release.
The stack was cooler because fewer coal units were using it. Since the Dec. 22 coal fly ash spill, TVA has been running the plant at reduced capacity, with only one or two coal units using stack one instead of five. Stack temperatures, which were below the normal 250 degrees, allowed materials to condense into flakes when TVA performed a test burn Sept. 18 to see what type of coal can be used with new scrubbers.
The report notes that exposure to coal fly ash should be avoided. "However, due to the small amount of material deposited, the short exposure duration, the relatively low toxicity of the material and the generally larger particle sizes involved (not breathable) there should be no health effects from this incident," the report reads.
The Tennessee Department of Environment and Conservation, which makes recommendations to the state's Air Pollution Control Board, is awaiting the final report to see what actions, if any, it might recommend be taken. TVA announced that it would notify the public beforehand if decides to do more test burns.
The preliminary report is on the TVA Web site at www.tva.gov/kingston/moreinfo.htm#1009update
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