Radioactive wasps nest uncovered at nuclear site used to make Cold War bombs

A radioactive wasp nest has been found by workers at a nuclear facility that made key parts for bombs.

Employees who routinely check radiation levels at the Savannah River Site near Aiken, in South Carolina, found a wasps nest on July 3 on a post near tanks where liquid nuclear waste is stored, according to a report from the US Department of Energy. And the nest had a radiation level 10 times what is allowed by federal regulations, officials in the US said.

The workers sprayed the nest with insect killer, removed it and disposed of it as radioactive waste. No wasps were found, officials said. It comes after a doctor's warning to people who drink even a 'single cup of tea'.

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

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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 — 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.

“I’m as mad as a hornet that SRS didn’t 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,” Mr 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 Aiken Standard.

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.