Multiple European nuclear monitoring agencies have detected higher than normal levels of radioactive isotopes in the atmosphere above Scandinavia and western Russia.
From June 22 to 23, The Comprehensive Test Ban Treaty Organization (CTBTO)—a watchdog group that operates monitoring stations to help enforce nuclear treaties—noticed elevated levels of caesium-134, caesium-137, and ruthenium-103 from its monitoring station in Sweden.
A spokesperson for the Rosenergoatom power company, which operates both plants, told Russian news agency TASS that both plants are operating normally and that no leak has been detected on its end.
"Both stations are working in normal regime,” the company told TASS.
The combination of radionuclides may be explained by an anomaly in the fuel elements of a nuclear power plant,” RVIM, the Netherlands nuclear monitoring agency, said on its website.