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The containment structure encasing the Chornobyl reactor core within Ukraine can no longer perform its main function of containing radioactive material, as announced by the International Atomic Energy Agency (IAEA). This loss of function follows a drone strike earlier this year that caused significant damage in the structure.

Structural Compromise from Aerial Attack Degrades Safety Structure

An attack by an unmanned aerial vehicle in February severely damaged the multibillion-euro “new safe confinement” structure. This massive shield, constructed for €1.5bn and completed in 2019, was intended to seal off radioactive material over the long term. A recent IAEA assessment mission confirmed that the drone impact had degraded the integrity of the steel arch.

The [protective structure] had lost its primary safety functions, including the confinement capability, said IAEA director general Rafael Grossi. Grossi noted that inspectors found no lasting harm to its load-bearing structures or sensor systems.

Background Context of the Chornobyl Shelter

The initial 1986 disaster at the Chernobyl plant – which occurred when Ukraine was part of the USSR – released radioactive fallout across Europe. During a frantic response, Soviet authorities constructed a concrete “sarcophagus” over the damaged reactor, but it had a three-decade design life. The New Safe Confinement was constructed to enable the eventual dismantling of the old sarcophagus, the destroyed reactor hall, and the molten fuel within.

Present Status and Necessary Steps

Although limited repair work has been done, agency officials emphasized that a full-scale repair effort is absolutely necessary. This is required to stop additional deterioration and to guarantee safety for the coming decades. Officials in Ukraine had stated that a unmanned aircraft armed with a powerful explosive struck the facility, igniting a blaze and damaging the protective cladding.

• Radiation Levels: Authorities confirmed background radiation remained within safe limits after the incident with no indication of radiation leaks.
• Conflict Background: Russian forces occupied the Chernobyl exclusion zone for more than 30 days in the early stages of the full-scale war.
• Wider Assessment: The IAEA carried out this review alongside a country-wide assessment of war damage to the country's power substations.

These developments underscore the persistent risks at one of the the planet's most notorious nuclear disaster sites amid ongoing armed conflict.