Atomkatastrophen weltweit - immer mal wieder!

Evin schrieb:

https://morgsatlarge.wordpress.com/2011/03/13/why-i-am-not-worried-about-japans-nuclear-reactors/

Dann hoffen wir mal, dass er recht hat. :/

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MiXeR schrieb:

Sehr interessanter Artikel, der tatsächlich ein wenig Hoffnung macht.
Möge der gute Mann Recht behalten.

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wenn man die übliche qualität der berichterstattung während solcher katastrophen berücksichtigt.

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Evin schrieb:

MiXeR schrieb:

Sehr interessanter Artikel, der tatsächlich ein wenig Hoffnung macht.
Möge der gute Mann Recht behalten.

Zum Vergrößern anklicken....

Danke, hatte schon die Befürchtung der Artikel sei zu lang...

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- The plant is safe now and will stay safe.

- Japan is looking at an INES Level 4 Accident: Nuclear accident with local consequences. That is bad for the company that owns the plant, but not for anyone else.

- Some radiation was released when the pressure vessel was vented. All radioactive isotopes from the activated steam have gone (decayed). A very small amount of Cesium was released, as well as Iodine. If you were sitting on top of the plants’ chimney when they were venting, you should probably give up smoking to return to your former life expectancy. The Cesium and Iodine isotopes were carried out to the sea and will never be seen again.

- There was some limited damage to the first containment. That means that some amounts of radioactive Cesium and Iodine will also be released into the cooling water, but no Uranium or other nasty stuff (the Uranium oxide does not “dissolve” in the water). There are facilities for treating the cooling water inside the third containment. The radioactive Cesium and Iodine will be removed there and eventually stored as radioactive waste in terminal storage.

- The seawater used as cooling water will be activated to some degree. Because the control rods are fully inserted, the Uranium chain reaction is not happening. That means the “main” nuclear reaction is not happening, thus not contributing to the activation. The intermediate radioactive materials (Cesium and Iodine) are also almost gone at this stage, because the Uranium decay was stopped a long time ago. This further reduces the activation. The bottom line is that there will be some low level of activation of the seawater, which will also be removed by the treatment facilities.

- The seawater will then be replaced over time with the “normal” cooling water.

- The reactor core will then be dismantled and transported to a processing facility, just like during a regular fuel change.

- Fuel rods and the entire plant will be checked for potential damage. This will take about 4-5 years.

- The safety systems on all Japanese plants will be upgraded to withstand a 9.0 earthquake and tsunami (or worse).

- I believe the most significant problem will be a prolonged power shortage. About half of Japan’s nuclear reactors will probably have to be inspected, reducing the nation’s power generating capacity by 15%. This will probably be covered by running gas power plants that are usually only used for peak loads to cover some of the base load as well. That will increase your electricity bill, as well as lead to potential power shortages during peak demand, in Japan.

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At some stage during this venting, the explosion occurred. The explosion took place outside of the third containment (our “last line of defense”), and the reactor building. Remember that the reactor building has no function in keeping the radioactivity contained. It is not entirely clear yet what has happened, but this is the likely scenario: The operators decided to vent the steam from the pressure vessel not directly into the environment, but into the space between the third containment and the reactor building (to give the radioactivity in the steam more time to subside). The problem is that at the high temperatures that the core had reached at this stage, water molecules can “disassociate” into oxygen and hydrogen – an explosive mixture. And it did explode, outside the third containment, damaging the reactor building around. It was that sort of explosion, but inside the pressure vessel (because it was badly designed and not managed properly by the operators) that lead to the explosion of Chernobyl. This was never a risk at Fukushima. The problem of hydrogen-oxygen formation is one of the biggies when you design a power plant (if you are not Soviet, that is), so the reactor is build and operated in a way it cannot happen inside the containment. It happened outside, which was not intended but a possible scenario and OK, because it did not pose a risk for the containment.

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Evin schrieb:

https://morgsatlarge.wordpress.com/2011/03/13/why-i-am-not-worried-about-japans-nuclear-reactors/

Dann hoffen wir mal, dass er recht hat. :/

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rancid schrieb:

quelle?

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satzberger schrieb:

Tepco hat zugegeben das die Reaktorhülle Risse hat. (AKW Fukushima 1)

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