Sinkhole develops under dam in US

Sinkhole develops under dam in US — 7 nuclear reactors downstream — Water now seeping out — Gov’t notified of ‘stability issues’, plants begin evaluating potential flood impacts — Official: An ‘uncommon’ occurrence, we’re monitoring it continuously and working around clock — Structure same height as Niagra Falls

boone dam tennesseJohnson City Press, Oct. 30, 2014 (emphasis added): Oct. 20 inspection of [Tennessee’s Boone] dam revealed a sink hole… Six days later, an uncommon occurrence happened when seepage was found near the location of the sink hole at the base of the dam…

NRC, Oct. 30, 2014: … BOONE DAM STABILITY ISSUES… “TVA conducted a briefing for government officials… after discovery of a sink hole near the base… water and sediment [has been] found seeping from the river below the dam. TVA is continuously monitoring the dam… The dam is located upstream of all three TVA nuclear sites… The NRC Senior Resident Inspector was notified. The licensee is evaluating this event for potential impact on the design basis flooding level.”

Times Free Press, Oct. 30, 2014: Tennessee Valley Authority engineers [will] search for the source of water seepage… Water and sediment were found Sunday seeping from the river bank below the dam.

TVA, Oct. 30, 2014: A sink hole was discovered near the base… water and sediment was found seeping from the river bank below the dam…

John McCormick, VP at TVA: [We’re] exercising an abundance of caution… Unless it’s a huge storm, we can do what we need… we are continuously monitoring the dam… engineers want to be sure we understand what caused the sink hole and where the water and sediment is coming from.

WCYB, Oct. 30, 2014: [A] sinkhole and seepage of clay particulates into the water at Boone dam… [is near] the bottom of structure on the river side of the dam… TVA employees are working around the clock to find the cause of the sinkhole and the source of the seepage. “The seepage into the waterway is not a common occurrence,” said McCormick… they do not have a definite timetable for finding the source of the seepage… read more…

NRC Engineers Charge Gov’t Coverup — Reactor melt down an “absolute certainty” if dam fails — 100s of times more likely than tsunami that hit Fukushima

An engineer with the Nuclear Regulatory Commission (NRC) says the agency has withheld documents showing reactor sites downstream of dams are vulnerable to flooding, and an elevated risk to the public’s safety.

Richard Perkins, an NRC reliability and risk engineer, was the lead author on a July 2011 NRC report detailing flood preparedness. He said the NRC blocked information from the public regarding the potential for upstream dam failures to damage nuclear sites.

The report in question was completed four months after an earthquake and resultant tsunami caused the Fukushima Daiichi nuclear reactor in Japan to experience a meltdown.

The report concluded that, “Failure of one or more dams upstream from a nuclear power plant may result in flood levels at a site that render essential safety systems inoperable.” read more