Article from NHK News, excerpt :
" Tokyo Electric Power Company says radioactive debris and high humidity are hampering the investigation by robots at the Fukushima Daiichi nuclear plant.
The company began using remote-controlled robots to explore the first three reactor buildings on Sunday and Monday.
At the Number 2 reactor building, the robot's camera lens was instantly clouded by high humidity.
TEPCO officials think that the steam is coming from the damaged section of the reactor's suppression pool.
But they have not found a way to resolve the problem as the steam could be highly toxic.
Robots entered the Number 3 reactor building through the southern entrance, but their path was blocked by debris. The firm is considering using another robot that can remove obstacles weighing up to 100 kilograms."
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