The operator of the crippled Fukushima Daiichi nuclear power complex said Thursday it successfully retrieved a small amount of melted fuel from the No. 2 reactor damaged in the massive earthquake and tsunami disaster that struck northeastern Japan in March 2011. It is the first time Tokyo Electric Power Company Holdings Inc. has removed melted fuel from one of the reactors at the Fukushima plant, a task viewed as the largest hurdle in the decades-long process of decommissioning the complex.