Workers wearing protective suits and masks are seen from the coastal side, in front of the No. 3 reactor building at the tsunami-crippled TEPCO's Fukushima Daiichi nuclear power plant in Fukushima prefecture November 7, 2013. REUTERS/Kimimasa Mayama/Pool
TOKYO (Reuters) - The operator of Japan's wrecked Fukushima nuclear plant knew about record high measurements of a dangerous isotope in groundwater at the plant for five months before telling the country's nuclear watchdog, a regulatory official told Reuters.
Tokyo Electric Power Co (Tepco) said late on Wednesday it detected 5 million becquerels per litre of radioactive strontium-90 in a sample from a groundwater well about 25 metres from the ocean last September. That reading was more than five times the broader all-beta radiation reading taken at the same well two months earlier.
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