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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 275  

post #2741 of 2836
Quote:
Originally Posted by Dromihetes View Post
So you are saying that cooling is used even when the plant is off ?!
Sounds strange to me.
If the plant needed cooling (cooling system that brake due to flood ) it means that the plant was on.Or maybe i m wrong.
I always considered Japan to be the country where everything is perfectly set up.
If you keep your stove on for hours and then turn it off, is it not hot for some time after you turned it off?

You can't turn off a nuclear plant "just like that". It needs continuous cooling or stuff will go terribly wrong.
The Fukushima reactor's cooling was cut off, and so, stuff did indeed go terribly wrong.
post #2742 of 2836
Quote:
Originally Posted by Semyon View Post
The control rods that "stop" the reaction stop the neutrons released from each uranium atom from hitting other uranium atoms. However, the already-fissioned uranium atoms produce many other radioactive atoms which decay on their own and release enormous amounts of heat (5% of no-control rods IIRC) for days, weeks etc. These products must be cooled, or the unchecked heat will melt the entire assembly. Unfortunately, fuel rods were left completely exposed to air, without any cooling at all, and that is exactly what has happened in three reactors. This is a complete meltdown.
Thank you for the complete expose
You have a 10 (or A+) for today !
   
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post #2743 of 2836
Quote:
Originally Posted by Lampen View Post
Yep the new shell is expected to be complete and in place by 2014-2015. As for the Zone of Alienation it is open for tourism now. It costs about 160 USD for an official tour with one of the tour agencies that are allowed to conduct the trips. The background radiation really isn't bad at all. You get more on a transcontinental flight then you do during a couple days in the Zone. However you need to be careful to not kick up dust/dirt and should avoid vegetation inside the Zone because of the high concentrations of Cesium still on the site. I'll be going there sometime this August! Have to get there before the new shell is in place and that iconic image of Reactor 4 is gone.
yeah i saw some articles on it and about the tours just didn't understand the radiation levels. Take many pictures good sir. Wish I could go.
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post #2744 of 2836
Quote:
Originally Posted by black06g85 View Post
But I still don't understand why you would put emergency back up generators below sea level in an area prone to tsunami's. Doesn't really make sense
You do know that the tsunami wall dropped nearly 2m in height during the quake. If it hadnt dropped in hieght it may have stopped the tsunami altogether
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post #2745 of 2836
Quote:
Originally Posted by Lampen View Post
Yep the new shell is expected to be complete and in place by 2014-2015. As for the Zone of Alienation it is open for tourism now. It costs about 160 USD for an official tour with one of the tour agencies that are allowed to conduct the trips. The background radiation really isn't bad at all. You get more on a transcontinental flight then you do during a couple days in the Zone. However you need to be careful to not kick up dust/dirt and should avoid vegetation inside the Zone because of the high concentrations of Cesium still on the site. I'll be going there sometime this August! Have to get there before the new shell is in place and that iconic image of Reactor 4 is gone.
"You'll be fine, just don't drink the water. Here, have a complimentary oxygen mask."
post #2746 of 2836
Nuclear fuel has melted through base of Fukushima plant

http://www.telegraph.co.uk/news/8565...ima-plant.html
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post #2747 of 2836
Any new news??
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post #2748 of 2836
Thread Starter 
Quote:
Originally Posted by Mr. Original View Post
Any new news??
Not a whole lot. There was a recent report about the high levels of Strontium-89 and Strontium-90 being detected in the water supply near the plants.

Full story:

Quote:
Excessive levels of highly toxic strontium have been detected in seawater and groundwater at Japan's Fukushima Daiichi nuclear complex, the plant operator said Monday, a development that suggests an increased risk of radioactive contamination further entering the food chain.

Also underscoring the difficulties of trying to stabilize the stricken facility, operator Tokyo Electric Power Co. said six more workers have received more than the permitted annual emergency levels of radiation exposure.

The Strontium-89 and Strontium-90 isotopes are believed to have been released from the damaged reactors when the fuel cores overheated and melted after the March 11 earthquake and tsunami, Tokyo Electric, also known Tepco, said at a briefing. In all, the amount of contaminated water now flooding the basements and the connected trenches of the plant's reactor buildings is estimated at more than 100,000 tons.

Environmental experts said the discovery of the strontium heightens the risk of contaminated seafood in the area, now complicated by the arrival of seasonally heavy rains.

"With the arrival of the rainy season, more and more radioactive fallout is being washed into groundwater and the sea, raising the levels of strontium contamination," said Ikuro Anzai, professor emeritus at Ritsumeikan University.

Strontium acts like calcium and accumulates in bones. Unlike other radioactive materials, such as cesium and iodine, strontium doesn't emit powerful gamma rays, and therefore, its harmful effects are limited unless it is ingested or inhaled. But once inside the body, it can cause bone cancer or leukemia.

"Japanese people often eat small fish, such as sardines, whole, including the bones and head. There is therefore a risk of consumers taking in strontium from contaminated small fish," Prof. Anzai said.

The government already has undertaken a program of testing of seafood in the nearby area and didn't announce any additional measures because of the latest disclosure. Prof. Anzai said there should be close monitoring for potential contamination because there is a risk of the radiation spreading through the food chain.

The six workers were found to have been exposed to more than the annual limit of 250 millisieverts now set for an emergency situation, during continuing check-ups on an estimated 3,700 staff who have worked at the plant during the crisis. Tepco said the six are likely to have been exposed to radiation from 265 to 498 millisieverts, according to preliminary results.

Two male workers were previously confirmed to have exceeded the annual limit, according to Tepco, while two women workers were found to have exceeded the limit of 5 millisieverts set for females in any three-month period. The discoveries come from the testing of all workers at the site. Of the staff, 2,400 have so far gone through check-ups for internal radiation.

Tepco continues to struggle with ways to reduce the amount of radiation at the site. It announced separately on Monday that it now expects a newly developed system for treating highly radioactive water to start full operation by the end of this week, to filter the rising amount of radioactive water produced by the continuous cooling of the reactor cores.

The decontamination system was originally scheduled to start operating Wednesday and delays add to concerns that the plant will run out of storage space for the contaminated water.

The system is made up mainly of zeolite-containing cartridges, developed by Kurion Inc. of the U.S., to absorb radioactive cesium and iodine, and of equipment built by French energy company Areva SA to remove radioactive materials. It can treat up to 1,200 metric tons of water daily.

After the water is decontaminated, it will be either used as coolant for the reactors or released into the ocean, according to Tepco.

Tepco said a separate device, set up near the coastline, started operating Monday to remove radioactive materials from seawater. Water is being pumped through the zeolite-filled device to collect cesium and other radioactive materials. But Tepco said it was not clear if it would remove strontium as well.
Source: http://online.wsj.com/article/SB1000...googlenews_wsj
Edited by Lampen - 6/13/11 at 12:04pm
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post #2749 of 2836
Quote:
Originally Posted by cdoublejj View Post
Nuclear fuel has melted through base of Fukushima plant

http://www.telegraph.co.uk/news/8565...ima-plant.html
It hasn't melted through the based of the plant, it melted through the bottom of the pressure vessel. Completely different things.
post #2750 of 2836
Quote:
Originally Posted by SgtSpike View Post
It hasn't melted through the based of the plant, it melted through the bottom of the pressure vessel. Completely different things.
i just copy and pasted it as i saw it on reddit. Question and trust me I am a bad person for asking this but, as bad as it is would dilution help having it spread among such vast area or having it washed away help lower the contamination levels over all?
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