By Esther Tanquintic-Misa | June 4, 2014 4:23 PM EST

Japan Starts Constructing Ice Wall at Crippled Fukushima Power Plant

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A worker stands in front of an 18-m (59-ft) high and 1.6-km (1-mile) long tsunami defence wall at Chubu Electric Power Co.'s Hamaoka Nuclear Power Station in Omaezaki, Shizuoka Prefecture, in this file picture taken May 17, 2013. In the three years since the Fukushima disaster, Japan's utilities have pledged $15 billion to harden their nuclear plants against earthquakes, tsunamis, tornadoes and terrorist attacks. But as Japan's nuclear safety regulator prepares to rule on whether the first of the country's 48 idled reactors is ready to be come back online, the post-Fukushima debate about how safe is safe enough has turned to a final risk: volcanoes. REUTERS/Toru Hanai/Files (JAPAN - Tags: BUSINESS ENERGY ENVIRONMENT DISASTER) (REUTERS/Toru Hanai/Files/)