FILE PHOTO: Workers prepare frozen pipes during operations to construct an underground ice wall at Tokyo Electric Power Co.'s (Tepco) tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima Prefecture July 9, 2014. REUTERS/Kimimasa Mayama/Pool/File Photo
OKUMA, Japan (Reuters) - A costly "ice wall" is failing to keep groundwater from seeping into the stricken Fukushima Dai-ichi nuclear plant, data from operator Tokyo Electric Power Co shows, preventing it from removing radioactive melted fuel at the site seven years after the disaster.
When the ice wall was announced in 2013, Tepco assured sceptics that it would limit the flow of groundwater into the plant's basements, where it mixes with highly radioactive debris from the site's reactors, to "nearly nothing."
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