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COLUMBIA, S.C. (AP) 鈥� Workers at a site in South Carolina that once made key parts for nuclear bombs in the U.S. have found a radioactive wasp nest but officials said there is no danger to anyone.

Employees who routinely check radiation levels at the Savannah River Site near Aiken found a wasp nest on July 3 on a post near tanks where liquid nuclear waste is stored, according to from the U.S. Department of Energy.

The nest had a radiation level 10 times what is allowed by federal regulations, officials said.

The workers sprayed the nest with insect killer, removed it and disposed of it as radioactive waste. No wasps were found, officials said.

The report said there is no leak from the waste tanks, and the nest was likely radioactive through what it called 鈥渙nsite legacy radioactive contamination鈥� from the residual radioactivity left from when the site was fully operational.

The watchdog group Savannah River Site Watch said the report was at best incomplete since it doesn’t detail where the contamination came from, how the wasps might have encountered it and the possibility there could be another radioactive nest if there is a leak somewhere.

Knowing the type of wasp nest could also be critical 鈥� some wasps make nest out of dirt and others use different material which could pinpoint where the contamination came from, Tom Clements, executive director of the group, wrote in a text message.

鈥淚鈥檓 as mad as a hornet that SRS didn鈥檛 explain where the radioactive waste came from or if there is some kind of leak from the waste tanks that the public should be aware of,鈥� Clements said.

The tank farm is well inside the boundaries of the site and wasps generally fly just a few hundred yards from their nests, so there is no danger they are outside the facility, according to a statement from Savannah River Mission Completion which now oversees the site.

If there had been wasps found, they would have significantly lower levels of radiation than their nests, according to the statement which was given to the

The site was opened in the early 1950s to manufacture the plutonium pits needed to make the core of nuclear bombs during the start of the Cold War with the Soviet Union. Now the site has shifted toward making fuel for nuclear plants and clean up.

The site generated more than 165 million gallons (625 million liters) of liquid nuclear waste which has, through evaporation, been reduced to about 34 million gallons (129 million liters), according to Savannah River Mission Completion.

There are still 43 of the underground tanks in use while eight have been closed.