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Meltdown in Japan??? Fallout here???


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2011 Mar 12, 12:39pm   22,491 views  255 comments

by terriDeaner   ➕follow (0)   💰tip   ignore  

As of right now, there seems to be some uncertainty as to whether meltdowns (yes, multiple) are underway at the failing nuclear facility in Japan. If there is a widespread release of radioactive particulates, is there any good way of knowing if any (and how much) would blow our way?

http://www.cnn.com/2011/WORLD/asiapcf/03/12/japan.quake/index.html?hpt=T1&iref=BN1

http://www.zerohedge.com/article/stratfor-japan-government-confirms-meltdown

http://www.nytimes.com/2011/03/13/world/asia/13nuclear.html?hp

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249   zzyzzx   2011 Mar 22, 12:40am  

terriDeaner says

#3 and #4 both remain nasty question marks. And, as Troy pointed out earlier, the corroded pumps washed with seawater may or may not work when power is restored. I sincerely hope they will, but I have some doubts

The pumps will work just fine. They weren't washed in seawater all that long. It's the pump motor which will ideally need to be rinsed and dried out. Since this isn't an ideal situation they will most likely just try turning on one pump at one of the reactors and see if it works type of thing. My personal experience suggests that if the motor turns when first turned on and doesn't stall out or anything, the heat generated by the motor itself will dry it out much quicker than the usual way of drying out an electric motor, which usually consists of putting a space heater next to it and then a tarp over the whole thing and letting it sit for a couple of days (longer times needed for bigger motors to dry out). In fact at one plant I used to wkr out that's how we sometimes stored bigger electric motors (ones way bigger than these coolant pump motors). It's not like there is only one motor in these cooling systems, I'm guessing that there are at least 3, so trying out the just turning one on if it looks OK is a reasonable method to see if it works in this situation. of course, under normal circumstances where you would have the luxury of time, you would dry out the motor and then do some testing on it (without powering it up) before you would actually try to use it.

Tsunami picture that I just found:

250   terriDeaner   2011 Mar 22, 2:10am  

I saw that scene in an aerial photo. Pretty fucked up.

251   American in Japan   2011 Mar 22, 1:18pm  

The rain has stopped. As bad as is might be, Fukushima has it much worse. I've estimated he wind only has blown (from Fukushima) toward Tokyo /Kanagawa only 15% of the time. It has blown toward the Pacific Ocean 2/3 of the time and the rest toward Miyagi/Iwate/Akita/Yamagata, etc.

253   terriDeaner   2011 Mar 22, 3:33pm  

Thanks for the update AiJ. Most of the major western news sources have moved on to covering the Libyan invasion. Please be selective in what you eat:

From bloomberg:

Five kinds of radioactive materials released by damaged fuel rods were detected in the sea, including iodine-131, cesium-134 and cobalt, according to Tepco. Radiation in food is measured in Becquerel, a gauge of the strength of radioactivity in those materials. The prescribed safe limit for I-131 in vegetables is set at 2,000 Becquerel (Bq) per kilogram and 500 Bq/kg for radioactive cesium.

Screening food for radiation is being stepped up as Japan seeks to calm a population that eats more fish than any other nation except China. Shih-Yew Chen, a researcher at Argonne National Laboratory in Illinois, said the levels found so far in milk and vegetables could cause a slight increase in the number of cancer cases.

“A person would really have to continue to eat that food grown locally that’s contaminated,” he said.

Do you have a substantial choice in what foods are available to you?

254   terriDeaner   2011 Mar 22, 3:39pm  

American in Japan says

Good story about the difference in media coverage on the earthquake/tsunami/nuclear plant:

Thanks for the link. Quite a range of opinions there.

255   American in Japan   2011 Mar 22, 3:52pm  

Ironically food from China may be healthier than from here for the time being!

And this info I found out about various elements:

in the reactor, the zirconium alloy fuel cladding starts to fail at 1200 C (cesium-137 and iodine-131 are in the fuel cladding-gap region of the fuel rods, so when the cladding fails these are also released, and hydrogen builds up when the cladding reacts with hot steam)
the uranium fuel itself starts to melt at 3204 C.

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