Ukraine inaugurates giant dome over destroyed Chernobyl reactor Ukraine and its European partners formally inaugurate a new metal dome encasing the destroyed reactor at the infamous Chernobyl plant, wrapping up a two-decade effort. Branded as the world's largest moveable metal structure, the so-called New Safe Confinement seals the remains of the fourth reactor at the nuclear plant that was the site of the massive Chernobyl disaster in 1986. IMAGES AND SOUNDBITES of the ceremony in Chernobyl