Warning: A crucial safety shield at the Chernobyl nuclear reactor has failed in its primary containment role after a drone strike, according to a UN watchdog. The International Atomic Energy Agency (IAEA) reports that the large shell over the site of the 1986 disaster no longer performs its key safety function of confinement.
In February, Ukraine accused Russia of targeting the power plant—a claim the Kremlin denied. Repairs are deemed essential by the IAEA to stop further deterioration of the shelter. Environmental expert Jim Smith, speaking to the BBC, cautions that while the situation is not a cause for panic, the risk must be managed. Smith, a professor at the University of Portsmouth who has studied Chernobyl’s aftermath, notes that the main danger at the site is disturbing contaminated dust. He explains that the risk remains relatively low because the radioactive dust is contained within a thick concrete sarcophagus beneath the protective shield.
The Chernobyl disaster in 1986 released radioactive material across Europe, prompting the former Soviet Union to build the sarcophagus over the reactor. That structure was designed with a 30-year lifespan, creating a need for a robust shield to prevent leakage for the following century. The IAEA’s safety assessment, conducted after the drone strike severely damaged the outer cladding of the steel shell, found no permanent damage to the shell’s load-bearing components or monitoring systems, and noted that some roof repairs had already been completed.
IAEA Director General Rafael Grossi underscored the urgency of timely, comprehensive restoration to prevent further degradation and safeguard long-term nuclear safety. Since early December, the UN watchdog has been evaluating Ukraine’s energy infrastructure as the country continues to defend itself against Russia. Overnight, Russia conducted airstrikes on Kremenchuk, a major industrial city in central Ukraine.
Beyond Chernobyl, the IAEA has been inspecting electrical substations tied to nuclear safety and security. Grossi emphasized their critical role: power is essential for cooling reactors and operating safety systems at all nuclear plants, and the electricity they generate must also reach households and industry.
