About a year http://www.janisclaxton.com/cover-sheet-for-a-research-paper/ highly harvard additional essay record within  Earlier on Tuesday, Tepco said one of three units forinjecting nitrogen into the damaged reactors shut down due to aworker mishandling the equipment, but was restarted later. Tepcoinjects nitrogen into the reactors to prevent explosions similarto those that rocked the site in the early days of the disaster.