'Nuclear-powered' missile accident in Russia: What really happened?

'Nuclear-powered' missile accident in Russia: What really happened?: A missile engine exploded at a naval test range, west of the city of Severodvinsk on Russia's northern coast at 9am on August 8. At least five people were killed and several others injured. As it is associated with Russia's defense program, the incident is shrouded in mystery. But shortly after the explosion the state weather monitoring agency, Roshydromet, reported a spike in radiation 40 km away.