http://www.yomiuri.co.jp/dy/national/T110610005496.htmNUCLEAR CRISIS: HOW IT HAPPENED / Government radiation data disclosure--too little, too late
The Yomiuri Shimbun
(Jun. 11, 2011)
On June 3, the Nuclear and Industrial Safety Agency released a shocking, but very belated, report about what happened around the Fukushima No. 1 nuclear plant immediately after the March 11 earthquake and tsunami.
At 8:39 a.m. on March 12, about 18 hours after the earthquake, radioactive tellurium-132 was detected in Namiemachi, Fukushima Prefecture, six kilometers from Tokyo Electric Power Co.'s damaged plant, according to the report from the agency.
The detection of Te-132 meant the temperature of nuclear fuel at the plant had shot up to more than 1,000 C. It also meant nuclear fuel pellets in the reactor cores had been damaged and nuclear material had leaked into the environment.
Seven hours later, a massive hydrogen explosion rocked the plant's No. 1 reactor.
Attempting to explain the delay in making the information public, agency spokesman Hidehiko Nishiyama said later, "We never meant to conceal the information, but it never occurred to us to make it public."