They said: “The Director General indicated that remote data transmission from safeguards monitoring systems installed at the Chernobyl NPP had been lost.”
The safeguards refer to IAEA work keeping track of nuclear material and waste products generated by nuclear power plants.
Following the destruction of reactor 4 at Chernobyl in 1986, the other reactors at the site continued operating until 2000.
However, a number of people still work on the site performing nuclear decontamination duties.
At least 210 staff members are being held captive by Russian forces at the site.
Although outside of the remnants of reactor 4 radiation levels at the site are relatively low the IAEA is urging Russian forces to allow staff to leave.
They argue this is to ensure a “safe rotation” of staff to prevent them spending too long at the site to avoid contamination, in line with standard practice since the 1986 disaster.
IAEA director general Rafael Mariano Grossi has offered to travel to Chernobyl to negotiate the release of the staff being held.
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They said: “Stop shooting at a nuclear facility. Stop shooting immediately!
“You threaten the security of the whole world!”
The IAEA has since confirmed that none of the six reactors that produce 20 percent of Ukraine’s electricity were damaged and radiation levels were normal.