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HomeNuclearZaporizhzhia NPP: connection to main external power line lost

Zaporizhzhia NPP: connection to main external power line lost

On 4 July, Ukraine’s Zaporizhzhia Nuclear Power Plant (NPP) lost the connection to its main external power line, forcing it to rely on recently restored backup power supplies for the power it needs for essential nuclear safety and security functions, according to the International Atomic Energy Agency (IAEA)’s Director General, Rafael Mariano Grossi.

The facility’s sole remaining 750 kilovolt (kV) power line, out of four available before the Russian invasion, was disconnected at 01:21 AM local time on Tuesday. It was not immediately known what had prompted the power cut or how long it would last, the IAEA said.

The nuclear power plant has been experiencing major off-site power problems since the start of the invasion in early 2022.

The disconnection of the 750 kV power line meant the Zaporizhzhia NPP had to switch to its only available 330 kV backup power line for off-site electricity that is needed, for example, to pump cooling water for the plant. This 330 kV line was only reconnected to the plant on 1 July after being damaged four months ago.

“This time the plant avoided a complete loss of all external power – which has happened seven times previously during the conflict – but the latest power line cut again demonstrates the precarious nuclear safety and security situation at the plant,” the IAEA Director General said.

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