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David Haslewood suggested an arch, built off-site, and then slid over the existing Soviet-built sarcophagus because:The foundations of the New Safe Confinement were designed to meet the primary requirements:Each crane can carry a variety of interchangeable carriages. The original shelter, formally referred to as the Shelter Structure and often called the sarcophagus, was constructed between May and November 1986. This option was selected to minimize the cost of the foundation, the number of cuts into radioactive soil layers, dose uptake of workers, and risk to the environment from further contamination. For example, the arch was made of structural elements designed and built in Italy. The foundation was required to account for this difference without extensive site leveling.The New Safe Confinement design is an arch-shaped steel structure with an internal height of 92.5 metres (303.5 ft) and a 12-metre (39.4 ft) distance between the centers of the upper and lower arch chords. Vertical walls assembled around, but not supported by the existing structures of the reactor building seal the ends of the structure.The New Safe Confinement (NSC) under construction in 2013A panorama view of the Chernobyl Nuclear Power Plant in June 2013. It will host a range of robotic devices such as grippers, drills, crushers, and saws.Construction on the €1.5 billion structure is completed.Its frame is a huge lattice construction of tubular steel members, supported by two longitudinal concrete beams.The cranes will have three different carriages available to them: a so-called classic carriage which features a hook on a cable that can be raised or lowered by a single drum; a secure carriage, which uses two drums, and will be used to move people around the shelter inside a shielded box; and a custom-made tensile truss system known as the mobile tool platform.Subsequently, a pan-European study (the TACIS programme) re-examined the proposals of the top three finalists and selected the sliding arch as the best solution.The dimensions of the arch were determined by the need to operate equipment inside to decommission the original sarcophagus covering the reactor. The Shelter Structure was moderately successful in confining radioactive contaminationand providing for po…
The overall length of the structure is 150 metres (492.1 ft), consisting of 13 arches assembled 12.5 metres (41 ft) apart to form 12 bays. Its foundations contain over 20,000m3 of concrete, equivalent to over 3200 truckloads and the arch is covered in 86,000 m2 of exterior cladding, an area the size of 12 football pitches.Dose rates in the main arch construction area are 0.0075 mSv/hr. It was an emergency measure to confine the radioactive materials within reactor 4 at the Chernobyl nuclear power plant (ChNPP). The ends of the structure are sealed by vertical walls assembled around, but not supported by, the existing structure of the reactor building.The advantages of a sliding arch include:The NSC was constructed 300 metres west of unit four before being slid into place. Two beams, usually referred to as B-1 and B-2, run in an east-west direction and support the roof beams and panels. The foundation has a slight elevation difference between the area in which the New Safe Confinement was constructed and the final resting area around reactor 4.The NSC under construction in April 2015Subsequently, a pan-European study (the TACIS programme) re-examined the proposals of the competition's top three finalists. These are largely considered to be structurally unsound as a result of explosive forces caused by the accident.