Japanese workers have measured radiation levels inside a reactor building, at the crippled Fukushima Number One Nuclear Plant. If the site is confirmed to be safe enough for crews to operate inside, full-scale efforts to stabilize the country's worst-ever atomic emergency will begin immediately.

Monday's move comes after the Tokyo Electric Power Company opened the doors linking the corridor to the adjacent turbine hangar the previous evening. According to officials, no particle activity increases have been recorded recently.

Restoration work has been hampered by a March 12th hydrogen explosion, and persistently dangerous radiation levels. The next step calls for crews to install and adjust equipment to measure water levels in the reactor's pressure vessel, and containment chamber.