Russian forces have been carrying out strikes on critical infrastructure amid freezing winter temperatures as their full-scale invasion approaches the four-year mark next month.
IAEA Director-General Rafael Grossi said the electrical grid was again the target of military activity this past weekend, leading to significant impacts to several regions and nuclear power plant operations.
The fighting caused power lines linking Ukraine with neighbouring countries to be disconnected, which in turn knocked out supplies inside Ukraine.
As a result, a unit at one nuclear power plant disconnected from the grid due to fluctuations and automatically shut down, while other units at other plants were forced to reduce power.
The Chornobyl site – where the world’s worst nuclear disaster occurred in 1986 – experienced a complete loss of offsite power and relied on its emergency diesel generators for roughly an hour.
“This latest grid event in Ukraine is a stark reminder of the ever-present risks to nuclear safety and security arising from deteriorating grid conditions,” said Mr. Grossi.
He stressed that extensive repairs are needed to improve the reliability of power supply to nuclear power plants and strengthen their resilience.
“Once again, I call for maximum military restraint, as well as full observance of the Seven Indispensable Pillars to enable these essential repairs to take place.”
The IAEA developed the seven pillars for nuclear safety in Ukraine in March 2022, just weeks after the war began – the first time ever that armed conflict has occurred amid the facilities of a major nuclear power programme.
Measures include maintaining the physical integrity of facilities, ensuring offsite power supply from the energy grid, and implementing effective radiation monitoring systems.
Operating staff must also be able to fulfill their safety and security duties and to make decisions without any undue pressure.
As military activity increases impacting the electricity grid in Ukraine, three IAEA teams are conducting a two-week mission visiting 10 substations critical to nuclear safety and security.
The objective is to assess the continuing damage to the grid, review repair efforts and identify practical steps to strengthen the resilience of off-site power supplies to nuclear power plants.
This marks the second IAEA mission in as many months. A mission this past December confirmed the effects of cumulative impacts on nuclear power plant operations and staff conditions.
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