Chernobyl New Safe Confinement (NSC) is an arched dome that was built to contain the radioactive remains of the destroyed reactor of the Chernobyl Nuclear Power Plant in Pripyat, Ukraine.
Because of the danger of working around the reactor, the structure was built adjacent to the power plant and moved into position on rails. When it was moved to its final position it was the largest moving structure ever built.
There are over 650,000 Tension Control Bolts installed in this mega-structure protecting the planet from toxic radiation.
Bolts are not radioactive
Includes stand & COA
Clear display box is optional — see product add-on below.
Also includes additional wooden stand that originally accompanied the bolts, but we didn't care for them aesthetically.
Head diameter: 52 mm (2 1/16")
Bolt length: 154 mm (6 1/16")
Bolt + nut weight: 1,082g (2.38lb)
Photos courtesy of SSE Chernobyl NPP
The Chernobyl Disaster: 26th April 1986 saw the world’s worst nuclear disaster as an explosion at the Chernobyl nuclear plant allowed radiation to spread over large parts of the continent and sent plumes of radioactive dust as far away as Japan and the U.S. causing extensive pollution and long lasting ecological damage. Following the explosion, the reactor was encased in concrete to prevent the further spread of radioactive dust. Poor design, rushed execution and the passage of time contributed to the deterioration of the original cocoon, resulting in a heightened risk of radiation leakage.
The Containment: Against this background, the Ukrainian government invited searched for a new solution to prevent future radiation leakage as early as 1992, but it took a further 15 years before the design was agreed and the contract awarded to Novarka, a joint venture between Vinci Grand Projects and Bouygues Travaux Publics. Steel for the new structure was fabricated in Italy by Cimolai, with over 650,000 Tension Control Bolts needed to hold the structure together installed by steel erection teams from all over Europe.
The immense New Safe Confinement was designed to be built adjacent to the site and railed across. It is the largest movable structure ever constructed. A true ‘one-off’ design which came under tremendous vibratory pressures both in construction of the arch as well as during relocation. Research was conducted particularly looking into bolts and following extensive testing Novarka engineers determined that Tension Control Bolts would be the best bolting assemblies to mitigate against this extreme vibration.
The Bolts: Tension Control Bolts are quick and easy to install and offer guaranteed tension which, together with visual inspection, removes the likelihood of operator error and ensures that connections are tightened in accordance with specifications. Nowhere was this more important than in the construction of the New Safe Confinement, where a rapid assembly speed was required to minimize workers’ exposure to radiation. Upon correct installation, the small end of the bolt is sheared off, guaranteeing it has reached optimal torque.
The Greenkote coating system on the Tension Control Bolts offered the designers of the New Safe Confinement important advantages, as it removed the risk of hydrogen embrittlement in high-strength bolts. Greenkote is also harder wearing than galvanising, offers excellent corrosion protection and readily accepts all paint systems.