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A protective shield covering the Chornobyl nuclear reactor within Ukraine has lost its main function of blocking radiation, according to the IAEA. This loss of function comes after a drone strike in February that blew a hole in the structure.

Structural Compromise from Aerial Attack Compromises Containment Structure

An attack by an unmanned aerial vehicle in February caused a breach in the multibillion-euro “new safe confinement” arch. This enormous protective structure, constructed for €1.5bn and completed in 2019, was intended to contain radiation for decades. An IAEA assessment mission confirmed that the drone impact had weakened the integrity of the steel arch.

The containment arch's main safety functions, such as confinement, are no longer operational, said IAEA head Rafael Grossi. He added that inspectors found no lasting harm to key support structures or monitoring systems.

Historical Context of the Chornobyl Shelter

The initial 1986 explosion at the Chernobyl plant – at a time when Ukraine was a republic within the Soviet Union – released radiation across Europe. During a frantic containment effort, Soviet authorities constructed a concrete shelter over the damaged reactor, but it had a 30-year lifespan. The New Safe Confinement was constructed to enable the eventual dismantling of the old sarcophagus, the destroyed reactor hall, and the melted nuclear fuel within.

Present Status and Necessary Actions

Although limited repair work has been done, agency officials stressed that comprehensive restoration is essential. This is required to stop additional deterioration and to ensure long-term nuclear safety. Officials in Ukraine had stated that a drone armed with a high-explosive warhead hit the plant, causing a fire and compromising the outer shielding.

• Radiation Levels: Reports indicated background radiation remained within safe limits after the incident with no indication of radiation leaks.
• Geopolitical Context: Moscow's troops seized the Chernobyl exclusion zone for over a month in the early stages of the 2022 invasion.
• Broader Inspection: The IAEA carried out this inspection concurrently with a country-wide assessment of war damage to Ukraine's power substations.

These developments underscore the ongoing vulnerabilities at one of the the planet's most notorious nuclear disaster sites during ongoing hostilities.