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FILE PHOTO: An aerial view from a plane shows a New Safe Confinement (NSC) structure over the old sarcophagus covering the damaged fourth reactor at the Chernobyl Nuclear Power Plant during a tour to the Chernobyl exclusion zone, Ukraine April 3, 2021. REUTERS/Gleb Garanich/File Photo - 

Ukraine said on Friday (Feb 25) it had recorded increased radiation levels from the defunct Chernobyl nuclear power plant, a day after the site was captured by Russian forces, due to military activity causing radioactive dust to rise into the air.

The former power plant was captured by Russian forces on Thursday after Russia launched a full-scale invasion of Ukraine, an adviser to the Ukrainian presidential office said.

The still-radioactive site of the 1986 nuclear disaster lies some 100 km (62 miles) from Kyiv.

Experts at Ukraine's state nuclear agency said the change was due to the movement of heavy military equipment in the area lifting radioactive dust into the air.

The International Atomic Energy Agency (IAEA) said the radiation at the site did not pose any danger to the public.

"The readings reported by the regulator – of up to 9.46 microSieverts per hour – are low and remain within the operational range measured in the Exclusion Zone since it was established," the IAEA said.

Agency Director General Rafael Mariano Grossi added it was of vital importance that the safe and secure operations of the zone's nuclear facilities should not be affected or disrupted in any way.

The European Bank for Reconstruction and Development said on Friday that the critical infrastructure of the plant has not been damaged and essential maintenance work was ongoing.

Ukraine's neighbour Poland said it had not recorded any increase in radiation levels on its territory.

France-based independent nuclear watchdog CRIIRAD said in a statement Friday it was trying to verify and cross-check the information at their laboratory.

"If the dose rates recorded correspond to real values, the situation is extremely worrying," CRIIRAD said, adding that further research is needed to interpret the data.

The resuspension of soil from military activities, or damage to nuclear facilities, being either storage of waste or the containment structure, could be one of the reasons for the rise in radioactivity levels, CRIIRAD spokesperson Bruno Chareyron said.

Another possibility was that the readings were inaccurate as a result of interference from cyberattacks, he said.

The area has many high-risk installations, including radioactive waste processing and storage facilities, most of them unsecured, CRIIRAD said.

Other reactors in Ukraine also pose a safety risk in case of an accident, the watchdog said. While it was possible to reduce the potential risk by shutting down the reactors, Ukraine depends on nuclear power for more than 50 per cent of their electricity supply, it said//CNA