Safe Confinement at Chernobyl Nuclear Power Plant Reactor 4 at the Chernobyl Nuclear Power Plant, Ukraine, was destroyed by an accident in 1986. Shortly after the disaster, a shelter, also known as the sarcophagus, was erected to prevent the reactor wreck from leaking radioactive material into the environment. The sarcophagus deteriorated and was replaced by the New Safe Confinement (NSC), a sliding arch structure situated on tracks which was designed to: convert reactor 4 into an environmentally safe system; reduce erosion and weathering of the original shelter and reactor 4; lessen the consequences if the existing shelter or reactor 4 were to collapse; and facilitate the safe deconstruction of the unpredictable structures within the NSC. The Challenge Prior to the construction of the NSC

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