In this image made frp, Japan's NTV/NNN Japan television footage, smoke ascends from the Fukushima Dai-ichi nuclear plant's Unit 3 in Okumamachi, Fukushima Prefecture, in northern Japan, on Monday, March 14, 2011. The second hydrogen explosion in three days rocked Japan's stricken nuclear plant, sending a massive column of smoke into the air and wounding 11 workers. (AP Photo/NTV/NNN Japan)