The State Nuclear Regulatory Inspectorate of Ukraine (SNRIU) said in a statement that Russian missiles hit a radioactive waste disposal site.
It is not clear where the attack happened at the disposal site of the Kyiv branch of the State Specialized enterprise.
The automated radiation monitoring system failed, according to the statement.
The extent of the radiation can't be assessed until the fighting stops.
The agency said that there is currently no threat from the radioactive waste impacting areas outside the site.
Russian troops reportedly seized the remnants of the Chernobyl nuclear plant.
The monitoring systems of the nuclear agency in Ukraine showed a rise in radiation levels. Russia denied there had been a change in radiation levels.
It is the fourth day of the invasion of the country by President Putin.
In a brief televised address this morning, Putin saluted the bravery of Russian special forces fighting in Ukraine.
Insider's live blog is covering developments as they happen.
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