National Public Radio: The Tennessee Valley Authority is reporting progress in cleaning up the sludge that coated a Tennessee neighborhood after a dike burst at a power plant Monday. Preliminary tests suggest there is no danger to millions of people who get their drinking water from the 652-mile Tennessee River. Hundreds of acres in east Tennessee remain under a thick layer of coal ash sludge. The Kingston Fossil Plant, where the spill took place, generates electricity for hundreds of thousands of …