One person was killed and more than 100 were hospitalized Friday in an explosion at the world's largest uranium enrichment plant in central Russia's Ural mountains.The incident in a workshop at the Ural Electrochemical Combine in Novouralsk happened after a cylinder with depleted uranium hexafluoride was "depressurized" at about 9 a.m. local time, according to Rosatom, Russia's state nuclear corporation, which owns the plant. Local news outlet E1 referred to the incident as an explosion..... Vyacheslav Tyumentsev, head of the Novouralsk Urban District, told residents not to panic."I appeal to the residents of Novouralsk with a request not to panic,...