According to Ukrainian intelligence, critical infrastructure, including open switchgear and transmission substations at all nuclear plants are at risk.

From: Kyiv Post — Ukraine’s Foreign Minister, Andrii Sybiha, citing intelligence sources, warned that Russia is planning strikes on Ukrainian nuclear facilities ahead of the coming winter.
He called on the United Nations and Ukraine’s allies to establish permanent monitoring missions at these power plants “to avert potential disaster.”
According to Ukrainian intelligence, critical infrastructure, including open switchgear and transmission substations at all nuclear plants, would be at risk.
These facilities are essential for the safe operation of nuclear power stations, and any damage could trigger a release of radioactive material in a nuclear incident with potentially global consequences. Ukrainian special services say they have already shared this information with Western partners and the International Atomic Energy Agency(IAEA).