Zaporizhia Nuclear Power Plant (NPP) had lost connection to a third power line but that two others remained available, it was not clear what had caused the loss of a third line, but there was no safety concern, the International Atomic Energy Agency (IAEA) reported, citing Ukraine's nuclear regulator.

"The Ukrainian regulator said it was not clear what had caused today’s loss of a third line. It said the remaining power line and the one on standby were sufficient to ensure that all safety systems remained fully functional without limitations," the IAEA said on its website on Wednesday night.

They also added that like other NPPs in Ukraine and elsewhere, the plant also has back-up diesel generators in case they are needed.

According to the report, Ukraine's largest nuclear power plant has four high voltage (750 kV) offsite power lines plus one on standby. Two of the four were damaged earlier.

The IAEA said that the site's two operating reactors – units 2 and 4 – slightly decreased their power supplies to the grid today to adapt to the changed power line situation.

Zaporizhia NPP was seized by Russian invaders on March 4.