According to the site’s operator, Russian military assaults on Ukraine’s Zaporizhzhia nuclear power station have forced the closure of one reactor.
Enerhoatom warned that there was still a possibility of radioactive leaks.
The EU has strongly denounced Russia’s activities at the plant, despite Moscow’s claim that Ukraine was behind the attack.
Zaporizhzhia, Europe’s largest petrochemical facility, was taken over by Russia in March, but its Ukrainian workers were allowed to stay.
“Terror tactics” are alleged by Ukraine to be used by the Russian military to launch rockets towards civilian areas from the position.
This week’s strikes have “created a major risk for plant safety,” Enerhoatom wrote on Telegram, adding that one of the reactors had to be shut down due to damage to a power wire, which has been repaired.
The EU’s top diplomat, Josep Borrell, issued a statement condemning Russian military activity near the plant, saying it “condemns Russia’s military activities.”
He added that Russian nuclear watchdog the IAEA should be given access to the plant, calling it a “severe and reckless” violation of international nuclear safety standards.
It was recently reported that Director-General Ban Ki-moon said the plant was “totally out of control.”
The factory and the surrounding area are controlled by Russian soldiers, located near Ukrainian-held territory. Radiation waste is stored in six pressurised water reactors.
According to reports from BBC correspondents, military equipment and rockets were transported into the compound by civilians in adjacent Nikopol, which is still under Ukrainian control.
Ukraine’s president Volodymyr Zelensky declared this would be a heinous crime and an act of terror.
The factory is located near Enerhodar, Ukraine, on the left bank of the Dnieper River in the southeast of the country (Dnipro in Ukrainian).
To prevent the possibility of a night-time attack by Ukrainian forces, the “protected status” of the nuclear power plant is being exploited by Russia, according to the UK’s defence ministry.