Posted on 05/05/2011 10:01:43 PM PDT by ransomnote
They’re gonna flood the drywell? Posted on May 5, 2011 by wormme
That’s what I get from this TEPCO proposal (http://www.tepco.co.jp/en/press/corp-com/release/betu11_e/images/110505e2.pdf). Correct me if I’m wrong.
Since it is unusual to flood the primary containment vessel (dry/well)…
Er…yes, that’s pretty unusual. As in, “never been done before, to my knowledge”. That’s a lot of water. But they seem confident the added stress won’t be problematic. And if I’m reading it right, they expect it to decrease the amount of rad material being spread from containment.
The only adverse side effect I see is that they might get overflow into a trench. If that overflows it goes to the turbine building. But they’ll be pumping out from the trench into the Waste Treatment Facility.
Wow. Sure hope they cyphered it twice, as Jethro would say.
(Excerpt) Read more at wormme.com ...
PS: TEPCO is referring to reactor 1 in Fukushima.
Since the containment is a pressure vessel, there’s no possibility of water getting out of the containment building through a trench anywhere. I can understand using the water as a radiation moderator to allow workers more time to work in the containment.
Apparently the concern is seismic (if I understood what I just read here:
http://seekerblog.com/2011/05/01/nisa-instructs-tepco-to-study-demonstrate-dry-well-flooding-is-safe-from-seismic/
They’ve had a few days so perhaps NISA and TEPCO have decided that it is seismically safe? Seems like their seismic concern has to do with going forward - drywell filled with water and then large aftershock hits?
http://seekerblog.com/2011/05/01/nisa-instructs-tepco-to-study-demonstrate-dry-well-flooding-is-safe-from-seismic/
Looking a little further, I was pleased to find
“-TEPCO has finally revealed some details about the actual construction of the temporary cooling system it will install.. at least at Unit No. 1. Here is a clip from the handout:”
Followed by a schematic that I don’t know how to embed but you can see it at the link:
http://atomicpowerreview.blogspot.com/
in case you are interested
“They’ve had a few days so perhaps NISA and TEPCO have decided that it is seismically safe? Seems like their seismic concern has to do with going forward - drywell filled with water and then large aftershock hits?”
It reads like they peformed the seismic analysis to ensure the integrity of the drywell if an earthqualke occurs while it is flooded.
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