Japanese authorities failed to disclose US data about the spread of radiation spewing from a crippled nuclear plant last year, a Cabinet minister said yesterday, leaving some evacuees fleeing in the same direction as the radioactive emissions.
News that Japan’s nuclear watchdog and the science and technology ministry sat on the information collected by US military aircraft — another sign of the chaos at the time — is likely to add to mistrust of nuclear power just days after the government approved the restart of two idled reactors.
The earthquake and tsunami on March 11 last year devastated the Fukushima Dai-ichi nuclear plant north of Tokyo, triggering explosions and meltdowns and causing about 160,000 people to flee the worst nuclear accident since Chernobyl in 1986.
US military aircraft gathered radiation data from March 17 to March 19 over a 45km radius and found that people in an area about 25km northwest of the plant — where some people were moving — were exposed to the annual permissible level of radiation within eight hours, Japanese media said.
The information was passed to the Japanese Nuclear and Industrial Safety Agency and the science and technology ministry by the Japanese Ministry of Foreign Affairs, but neither agency passed it to the prime minister’s office, which was overseeing the evacuations.
“It is extremely regrettable that this information was not shared or utilized properly within the government and I have no words to apologize, especially to the disaster victims,” Japanese Minister of Economy, Trade and Industry Yukio Edano, top government spokesman during the crisis, told a news conference.
The government had previously admitted that it failed to quickly disclose computer forecasts showing the direction radioactive material would disseminate, due to poor internal communication. The result was that thousands fled in the same direction as the radioactive material was drifting.
Two panels of experts, one appointed by the executive branch and the other by parliament, are wrapping up investigations into the causes and responses to the Fukushima crisis.
Edano declined to comment on whether any government officials would be fired or otherwise punished after the panels’ reports are issued.
Japan will also set up a new nuclear regulator in a few months after the expected passage of an enabling law, part of efforts to repair shattered trust in a regulatory regime long characterized by cozy ties between bureaucrats and utilities.
All of Japan’s 50 reactors have gone off line for safety checks and maintenance since the disaster. However, despite public opposition, the government on Saturday approved the resumption of operations at two plants in western Japan to avert a power crunch.