Japanese nuclear reactor that restarted 13 years after Fukushima disaster is shut down again / Robot retrieves 1st melted fuel from Japan's Fukushima nuclear reactor / Japanese nuclear reactor that survived earthquake that badly damaged Fukushima power plant restarts / A robot's attempt to get a sample of the melted fuel at Japan's damaged nuclear reactor is suspended / Robot to remove melted nuclear fuel debris from Japan's Fukushima reactor / First images show damage deep inside Japan's worst-hit nuclear reactor