Toshiba Corp.'s nuclear Inspection robot climbs stairs during a demonstration at a Toshiba factory in Yokohama, west of Tokyo, Wednesday, Nov. 21, 2012. The four-legged robot is designed to help at the meltdown-crippled Japanese nuclear plant, climbing over debris and venturing into radiated areas off-limits to human workers. (AP Photo/Itsuo Inouye)

Associated Press
Toshiba Corp.'s nuclear Inspection robot climbs stairs during a demonstration at a Toshiba factory in Yokohama, west of Tokyo, Wednesday, Nov. 21, 2012. The four-legged robot is designed to help at the meltdown-crippled Japanese nuclear plant, climbing over debris and venturing into radiated areas off-limits to human workers. (AP Photo/Itsuo Inouye)
Toshiba Corp.'s nuclear Inspection robot climbs stairs during a demonstration at a Toshiba factory in Yokohama, west of Tokyo, Wednesday, Nov. 21, 2012. The four-legged robot is designed to help at the meltdown-crippled Japanese nuclear plant, climbing over debris and venturing into radiated areas off-limits to human workers. (AP Photo/Itsuo Inouye)
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