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Old 11-02-2011, 11:53 AM
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Default Fukushima recriticality Nov 2011

Remember that old news about Nuclear meltdowns in Japan? Well its back in Mainstream News. The reason is, that TEPCO has confirmed that there is fission going on in the reactor #2. Elevated concentrations of gases that have a halflife of only days are proof of that. This is in line with the strangely elevated levels of radioactive Iodine measured over the past months. Official statement say that it happens only in some pockets of the completely molten fuel and there is no danger of a more widespread recriticality, but they look for signs of recriticality in the other reactors as well now, while dumping boronic acid on the fissioning reactor in the hope of stopping the reaction. Can we trust this assessment? I think at least the Japanese won't do so, given how the information policies played out regarding this topic so far. Also TEPCO still does not have a visual on the molten core, so they do not know yet how it looks like, where it is and in what shape it is. So the assessments made can only be made from deduction of instrument readings.

Tepco Detects Nuclear Fission at Fukushima Station - Bloomberg
Quote:
Tokyo Electric Power Co. detected signs of nuclear fission at its crippled Fukushima atomic power plant, raising the risk of increased radiation emissions. No increase in radiation was found at the site and the situation is under control, officials said.

The company, known as Tepco, began spraying boric acid on the No. 2 reactor at 2:48 a.m. Japan time to prevent accidental chain reactions. Tepco said it may have found xenon, which is associated with nuclear fission, while examining gases taken from the reactor, according to an e-mailed statement today.

“Given the signs, it’s certain that fission is occurring,” Junichi Matsumoto, a general manager at Tepco who regularly talks to the media, told reporters in Tokyo today. There’s been no large-scale or sustained criticality and no increase in radiation, he said.

Fission taking place in the reactor can lead to increases in radiation emissions and raises concerns about further leaks after another radioactive hot spot was discovered in Tokyo on Oct. 29. It’s possible there are similar reactions occurring in the No. 1 and No. 3 reactors, the other cores damaged at the station, Matsumoto said.

“Melted fuel in the No. 2 reactor may have undergone a sustained process of nuclear fission or re-criticality,” Tetsuo Ito, the head of Kinki University’s Atomic Energy Research Institute, said by phone.
...
[general assessment]
The radioactive cesium that flowed into the sea from the plant was 20 times the amount estimated by Tepco, according to the Institute for Radiological Protection and Nuclear Safety, which is funded by the French government.

The oceanic study estimates 27,000 terabecquerels of radioactive cesium 137 leaked into the sea from the plant. The

Fukushima station may have emitted more than twice the amount of radiation than estimated by the Japanese government at the height of the Fukushima accident, according to another study by the Atmospheric Chemistry and Physics journal.
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Old 11-02-2011, 11:56 AM
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Quote:
Originally Posted by auroraglacialis View Post
Can we trust this assessment?
"Can we trust the highly studied nuclear engineers about how their own device works?"

Yes?

Also, a sense of scale is valuable here.
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Old 11-02-2011, 01:05 PM
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Well it is not so much about if the nuclear engineers knowing how their devices work, it is about what will be made public at what time. It took months before TEPCO admitted that they had data suggesting complete core meltdowns from the beginning. Also all science and readings are based on models and statistics. So the engineers at the site have my respect for doing what they do, but they have limited data and need to work with that to create some idea of what is going on inside the "black box". They can detect some things but they can only predict with a certain probability what is actually going on inside. Also some of the instruments inside the reactor are damaged by the explosions - the data coming from them may not be entirely accurate (if they are, it would be even worse).

So with that sentence I wanted to hint at 2 things - uncertainty in the predictability of what is going on at the site and a slow flow of information from onsite personell and data to the public (intenionally or not).
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Old 11-02-2011, 03:55 PM
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Actually, not true at all.

Praying for meltdown: The media and the nukes
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The internet has allowed people to find things out for themselves, bypassing the Hollywood narrative demanded by TV producers and newspaper editors. For example, this splendidly clear technical explanation of the engineering behind the reactors rapidly received several hundred thousand hits. Subsequent reports of the power company's "secrecy" also disappeared as quickly as they arrived, when it was obvious you could watch the radioactivity levels in real-time.
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Old 11-02-2011, 07:46 PM
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All this is just scaremongering, everyone knows Fukushima never happened.
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Old 11-02-2011, 09:09 PM
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Oh I forgot, Fkeu'itan - its all just an eco-conspiracy to create another nature reserve like in Chernobyl.
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Old 11-02-2011, 09:21 PM
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This thread got silly really fast.
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Old 11-02-2011, 09:29 PM
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Alright, i'm sorry... That was my fault.
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Old 11-02-2011, 09:47 PM
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It can be either silly or a mudfight it seems. And i am tired of the second kind XD - Who wants to get the information and read up on it can do so, who chooses to ignore it - I dont give a bleep
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"Humans are storytellers. These stories then can become our reality. Only when we loose ourselves in the stories they have the power to control us. Our culture got lost in the wrong story, a story of death and defeat, of opression and control, of separation and competition. We need a new story!"

Last edited by auroraglacialis; 11-02-2011 at 10:05 PM.
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Old 11-03-2011, 11:38 AM
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HNM, Whats not true - that there is some recriticality happening? This is straight from TEPCO officials, it can't be any more official than that. Unless TEPCO has suddenly turned to become a scaremongerer.
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"Humans are storytellers. These stories then can become our reality. Only when we loose ourselves in the stories they have the power to control us. Our culture got lost in the wrong story, a story of death and defeat, of opression and control, of separation and competition. We need a new story!"
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Old 11-04-2011, 03:44 PM
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What's not true is your belief against all evidence about some kind of 'secrecy', conspiracy 'theory' style.
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Old 11-04-2011, 04:21 PM
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I was merely pointing out that up to now, TEPCO and other officials have not exactly a great record when it comes to telling outright what they know. Their information policy was criticized widely by the public, by mass media, by the "internet community" and even by other nuclear engineering people.
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"Humans are storytellers. These stories then can become our reality. Only when we loose ourselves in the stories they have the power to control us. Our culture got lost in the wrong story, a story of death and defeat, of opression and control, of separation and competition. We need a new story!"
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