Nuclear safety remains precarious at Ukraine’s Zaporizhzhya Nuclear Power Plant (ZNPP) and its six reactors cannot be restarted as long as the military conflict continues to jeopardize the situation at the site, Director General Rafael Mariano Grossi told IAEA Member States this week.

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Addressing the regular June meeting of the Board of Governors, the Director General briefed them about his 12th mission to Ukraine during the current conflict, which took place in early June, followed by a visit to Russia, which also focused on nuclear safety and security at the ZNPP.

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Addressing the Board meeting, he highlighted “the extremely vulnerable” status of the off-site power supply at the site, which for more than a month now has relied on one single power line for the electricity it needs to cool its reactors and spent fuel. Before the conflict, Europe’s largest nuclear power plant (NPP) had access to ten power lines.

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In addition, Director General Grossi noted that the ZNPP reactors’ “reliance on groundwater for cooling remains an interim solution, whilst in their cold shutdown state”.  The plant has depended on 11 groundwater wells since the downstream Kakhovka dam was destroyed two years ago.

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In their meeting in Kyiv on 3 June, Ukrainian President Volodymyr Zelenskyy “made a point to recognize the importance of the IAEA’s permanent presence” at the ZNPP, the Director General told the Board, adding he had assured President Zelenskyy of the IAEA’s continued commitment to Ukraine’s nuclear safety and to helping it rebuild its energy infrastructure.

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The Director General added: “As the military conflict moves further into its fourth year, Ukraine needs support, and the IAEA is providing it … it is also crucial to prepare for the reconstruction phase.”

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At the ZNPP, the IAEA team based there has held several meetings with the ZNPP to discuss the site’s electrical system and also visited its 750 kilovolt (kV) switchyard.

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Apart from the sole remaining 330 kV back-up line that was disconnected due to military activities on 7 May, the site does not know the current condition of its five other 330 kV lines, which remain unavailable after they were damaged outside of the ZNPP area early in the conflict.

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The ZNPP said maintenance work was conducted at one of the four 750 kV power lines that was originally connected to the ZNPP before being damaged in 2022. Since the conflict, the ZNPP had lost access to three of its 750 kV lines.

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In addition, the ZNPP informed the IAEA about a planned project to pump water into the cooling pond from the Dnipro River in order to maintain a water level that is sufficient to cool one operating reactor initially, followed by a second unit, until the pond reaches its full capacity. According to the site, a pumping station will be constructed to supply water directly to the cooling pond until the plant can rebuild the Kakhovka dam.

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The exact location of the pumping station cannot yet be determined, as it depends on the security conditions, the ZNPP said, adding the project would only start once military activities cease.

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Separately this week, the IAEA team was informed that that the Russian regulator, Rostekhnadzor, over the next two weeks will perform pre-licensing inspection activities at ZNPP reactor units 1 and 2, whose current operational licences issued by Ukraine are due to expire in December this year and in February 2026, respectively. The IAEA team has requested to observe these activities and will seek additional information regarding items such as the scope of these undertakings and any criteria for assessing nuclear safety.

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Over the past several weeks, the IAEA team has also been monitoring a leak in one reactor unit’s essential service water system which delivers cooling water to the safety systems. The leak – which can occur in NPPs without any significant safety consequences – was discovered during maintenance and the team was informed that it was caused by corrosion. It has since been repaired.

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The IAEA team reported hearing military activities on most days over the past weeks, at varying distances away from the ZNPP including last week’s purported drone attack on the site’s training centre.

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The Khmelnytskyy, Rivne and the South Ukraine NPPs are continuing to operate amid the problems caused by the conflict. Three of their nine operating reactor units are still undergoing planned outages for refuelling and maintenance. The IAEA teams at these plants and the Chornobyl sites have continued to report on – and be informed about – nearby military activities, including drones observed flying nearby. Last Monday, the IAEA teams at Khmelnytskyy and Rivne were required to shelter.

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Over the past two weeks, the IAEA teams based at these four sites have all rotated.

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As part of the IAEA’s assistance programme to support nuclear safety and security in Ukraine, the Chornobyl site received essential items to improve staff living conditions and the National Scientific Centre Institute of Metrology received personal radiation detectors.

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These deliveries were funded by Austria, Belgium, France and Norway and brought the total number of IAEA-coordinated deliveries since the start of the armed conflict to 140.

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Text Courtesy, IAEA