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Japan's Fukushima: incorrect readings, radioactive water found in tunnels

A string of conflicting reports, alleged safety mishaps, and miscalculated radiation readings have added to confusion and unease in Japan surrounding the nuclear situation.

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Photo from a Kyodo News helicopter at a height of roughly 1,500 meters and distance of more than 30 kilometers shows the Fukushima Daiichi Nuclear Power Station in Fukushima Prefecture on March 27. From L are the No. 1, No. 2, No. 3 and No. 4 reactors. Efforts have been under way to restore the crippled plant since the March 11 quake and tsunami disaster.

Kyodo News/Newscom

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The operator of the crippled Fukushima Daiichi nuclear plant was criticized for announcing incorrect radiation levels – higher than the actual readings – even as more leaks were being discovered in another part of the facility.

On Sunday evening TEPCO (Tokyo Electric Power Company), which has been criticized by officials for its handling of the crisis, said that water found in the No. 2 reactor’s building was 10 million times more radioactive than normal. It later announced that the correct reading was 100,000 times higher than the normal level.

A string of conflicting reports, alleged safety mishaps, and miscalculated radiation readings have added to confusion and unease in Japan surrounding the nuclear situation.

It is not clear what led to the inaccurate reading of the water, or what the actual reading of the radiation was. TEPCO reported on its website there was a "mistake in the assessment of the measurement of iodine-134."

Chief Cabinet Secretary Yukio Edano described the mistake as “absolutely unforgivable,” while acknowledging the strain that the workers at the site are under.

Radioactive water found in tunnels

TEPCO also announced Monday that high levels of radiation were detected in water in tunnels outside the No. 2 unit. The 1,000 millisieverts readings were taken from water in underground shafts outside the radiation-controlled areas.

One hundred millisievert per hour is generally regarded the amount at which cancer risks are increased. One thousand millisieverts is about four times the legal level for one year’s acceptable exposure for workers, though some experts maintain that even much higher levels have no discernible effect on human health.

"The airborne radiation is mainly contained within the reactor building. We must make sure this water does not seep out into the soil or out to sea," said Chief Cabinet Secretary Yukio Edano.

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