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became difficult. this may have been due to the approximate one-kilometer distance between monitoring posts and the reactor buildings. tepco decided to step up its monitoring and take measurements at additional locations near the number one to number four reactor buildings. the plant operator will also use remote controlled robots to measure the level of radioactivity inside reactor buildings. tepco says it needs to inject nitrogen into one of the reactors at fukushima daiichi to prevent a hydrogen explosion, but the work isn t going well. tepco tried to examine the number three reactor building on wednesday to see whether it could connect nitrogen injection pipes to the containment very willing. it ultzed aobot mounted camera because high radioactivity in the reactor building means workers can t stay there long, but the robot couldn t reach the necessary part of the containment vessel. the schedule for stabilizing the plant shows that tepco needs to inject nitrogen i ....