Tepco Retracts Chlorine, Arsenic Findings at Fukushima Station

Tokyo Electric Power Co. retracted readings for radioactive elements that the utility earlier said it found in water in the basements of buildings at its crippled Fukushima Dai-Ichi nuclear plant, after reviewing the data.

Chlorine-38 and arsenic-74 weren’t detected at the basement of the turbine building of the No. 1 reactor after the company said it found the radioactive materials on March 25, according to a statement on Tokyo Electric’s website.

The reported discovery of the chlorine in the turbine building of reactor No. 1 suggested chain reactions in the core continued after the reactor shut down, physicist Ferenc Dalnoki- Veress of the James Martin Center for Nonproliferation Studies in Monterey, California, wrote in a March 28 paper. Radioactive chlorine has a half-life of 37 minutes, Dalnoki-Veress said.

Tokyo Electric also lowered the readings for the density of other radioactive elements, including cesium-137, technetium-99m and lanthanum-140, found in the water that accumulated in the buildings.

To contact the reporter on this story: Tsuyoshi Inajima in Tokyo at tinajima@bloomberg.net

To contact the editor responsible for this story: Amit Prakash at aprakash1@bloomberg.net

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