Workers wearing protective suits and masks work atop of No.4 reactor building of Tokyo Electric Power Co. (TEPCO)'s tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima prefecture, Japan, Feb. 20, 2012. Members of the media were allowed into the plant on Monday ahead of the first anniversary of the March 11 tsunami and earthquake. It has been the second permitted media visit to the site since the disaster. [Xinhua]