Thursday, July 7, 2011

best explanation of the Fukushima meltdown

Excerpt from the article:


Meltdown: What Really Happened at Fukushima?

JAKE ADELSTEIN AND DAVID MCNEILLJUL 02, 2011















http://www.theatlanticwire.com/global/2011/07/meltdown-what-really-happened-fukushima/39541/


Throughout the months of lies and misinformation, one story has stuck: “The earthquake knocked out the plant’s electric power, halting cooling to its reactors,” as the government spokesman Yukio Edano said at a March 15 press conference in Tokyo. The story, which has been repeated again and again, boils down to this: “after the earthquake, the tsunami – a unique, unforeseeable [the Japanese word is soteigai] event - then washed out the plant’s back-up generators, shutting down all cooling and starting the chain of events that would cause the world’s first triple meltdown to occur.”


But what if recirculation pipes and cooling pipes, burst, snapped, leaked, and broke completely after the earthquake -- long before the tidal wave reached the facilities, long before the electricity went out? This would surprise few people familiar with the 40-year-old Unit 1, the grandfather of the nuclear reactors still operating in Japan.


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According to The Chunichi Shinbun and other sources, a few hours after the earthquake extremely high levels of radiation were being measured within the reactor one building. The levels were so high that if you spent a full day exposed to them it would be fatal. The water levels of the reactor were already sinking.After the Japanese government forced TEPCO to release hundreds of pages of documents relating to the accident in May, Bloomberg reported on May 19 that a radiation alarm went off 1.5 kilometers from the number one reactor on March 11 at 3:29 p.m., minutes before the tsunami reached the plant. TEPCO would not deny the possibility that there was significant radiation leakage before the power went out. They did assert that the alarm might have simply malfunctioned.
On March 11, at 9:51 p.m., under the CEO's orders, the inside of the reactor building was declared a no-entry zone. Around 11 p.m., radiation levels for the inside of the turbine building, which was next door to the reactor, reached hourly levels of 0.5 to 1.2 mSv. The meltdown was already underway.
Oddly enough, while TEPCO later insisted that the cause of the meltdown was the tsunami knocking out emergency power systems, at the 7:47 p.m. TEPCO press conference the same day, the spokesman in response to questions from the press about the cooling systems stated that the emergency water circulation equipment and reactor core isolation time cooling systems would work even without electricity.
Sometime between 4 and 6 a.m. on March 12, Masao Yoshida, the plant manager decided it was time to pump seawater into the reactor core and notified TEPCO. Seawater was not pumped in until hours after a hydrogen explosion occurred, roughly 8:00 p.m. that day. By then, it was probably already too late.
On May 15, TEPCO went some way toward admitting at least some of these claims in a report called “Reactor Core Status of Fukushima Daiichi Nuclear Power Station Unit One.” The report said there might have been pre-tsunami damage to key facilities including pipes. “This means that assurances from the industry in Japan and overseas that the reactors were robust is now blown apart,” said Shaun Burnie, an independent nuclear waste consultant. “It raises fundamental questions on all reactors in high seismic risk areas.”

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