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To: justa-hairyape

You wrote:

“But we do know that the corium was and may still be eating its way through the concrete core catcher.”

But (unless I’m misunderstanding) the article admits (I say ‘admits’ because it’s dramatized in a way that tortures the truth, i.e., “China Syndrome”) that the rods are still contained in the steel structure, ie, they are not in contact with the concrete superstructure.


9 posted on 12/01/2011 5:37:32 AM PST by WL-law
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To: WL-law
Technically there are two steel structures. That is what is causing the confusion. The inner steel structure is the RPV Reactor Pressure Vessel. That is where all the control rods and fuel rods are located. It is normally under high pressure. That has been pierced in all three reactors. #1 has anywhere from 70-90 % of the core escaped out the RPV. #2 and #3 have less. The RPV is located within a larger steel structure defined by a steel dry wall. This outer part of the reactor is supposed to remain relatively dry under normal operations. We do not know if the outer dry wall has been breached. Tepco is saying it has gotten close, but has not breached.

In #1 the rods and the RPV internals have almost completely melted and have dripped out of the RPV. Actually under pressure it can actually partially jet out the bottom of the RPV. That molten mass is now eating the drywell floor and has yet to get to the last steel wall which is called the dry wall. There is concrete on the dry well floor above the dry steel wall. That is the concrete that Tepco admits the corium (melted rods and stuff) is eating through.

Now that Tepco has admitted a significant amount of concrete floor erosion, there is another problem that must also be occurring. Gets much more technical and has to do with the drywell sumps and suppression chambers. Basically the corium mass could have flowed across the drywell floor and down the downcomers into the suppression pools. That is where the wet wells are located. That can cause a steam explosion and may have been what happened in Unit #2.

10 posted on 12/01/2011 5:57:39 AM PST by justa-hairyape
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