As I noted last week, reactors 1, 2 and 3 all melted down within hours of the Japanese earthquake.
On Monday, Mainchi Daily News provided an important tidbit:
A meltdown occurred at one of the reactors at the Fukushima No. 1 Nuclear Power Plant three and a half hours after its cooling system started malfunctioning, according to the result of a simulation using "severe accident" analyzing software developed by the Idaho National Laboratory.
Chris Allison [a former manager and technical leader at Idaho National Laboratory], who had actually developed the analysis and simulation software, reported the result to the International Atomic Energy Agency (IAEA) in late March. It was only May 15 when Tokyo Electric Power Co. (TEPCO) admitted for the first time that a meltdown had occurred at the No. 1 reactor at the Fukushima nuclear plant.
According to Allison's report obtained by the Mainichi, the simulation was based on basic data on light-water nuclear reactors at the Laguna Verde Nuclear Power Plant in Mexico that are about the same size as that of the No. 1, 2, and 3 reactors in Fukushima.
NOTE: This isn't a surprise, exposed, uncooled rods melted within hours. The first wave of radiation hit North America around March 18. We began protective herbal remedies March 14, what did you do? While I'm deeply concerned about human generations that may be living 700 million years from now after all of the half life of the radiation has long passed, my current concern is staying as healthy as possible.
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