Twenty-two years after the Chernobyl nuclear disaster, work is under way on a colossal new shelter to cover the ruins and deadly radioactive contents of the exploded Soviet-era power plant.For years, the original iron and concrete shelter that was...

Ukrainian officials signed a $505 million contract with a French-led consortium Monday for construction of a new shelter for the Chernobyl reactor, the site of the word’s worst nuclear accident.The project, financed by an international fund managed by...