Department of Energy officials have taken another step toward opening a Yucca Mountain nuclear waste site.
3.5 million documents about the planned nuclear waste dump were formally certified yesterday.
The documents contain scientific data, studies and geological analyses that will be referenced during upcoming license hearings.
More than 30 million pages are posted online.
The certification starts a clock ticking on the project's next phase.
By law, federal officials can apply to build a nuclear waste repository at the Nevada site six months after the backup documents have been certified.
DOE officials have pledged that their application will be ready by June 30.