Japan Earthquake

Japan Earthquake | Page 854

I do like how TEPCO has established that 1m from the top means time to move the water, "but it has not yet found a location to transfer the contaminated water to."
by Markfm 4/26/2011 5:34:11 PM

@dean/anybody- is borate expensive? I am looking at docs re NISA/METI finding they were using non compliant instrumentation in 06/07 and amongst the docs is one regarding low borate in sfp's so just wondering if I am looking at a load of 'economies' or just sloppiness
by elainekirk 4/26/2011 5:34:36 PM

TEPCO to fill No.1 reactor with water www3.nhk.or.jp Vote both sloppy and cheap.
by Markfm 4/26/2011 5:36:11 PM

Report Urges Storing Spent Nuclear Fuel, Not Reprocessing It www.nytimes.com
by Markfm 4/26/2011 5:42:39 PM

reactor #2
by Edano 4/26/2011 5:46:30 PM

@Edano just being hypothetical, not trying to suggest #3 cap is there or it isn't, who knows, but those yellow chunks are sitting right next to #4 in the pic. If I remember correctly #3 exploded before #4. Checking the vids, this seems to be a #4 wall chunk, so shouldn't we expect the rubble/dust from #4 to cover those chunks, rather than them sitting on top of its debris?
by talisker 4/26/2011 5:46:43 PM

@Edano: Comparing that yellow to the cap in the video still on page 2 here (as I write), I'd say it's exactly the same hue of yellow (with a strong green bias). Notwithstanding a flukey colour mismatch between the two media (highly unlikely coincidence), or something else painted the same colour as the cap, I believe it must indeed be debris from the cap. Hard to say from the pic whether the debris was blown off the cap from an external explosion or from one within the CV mind (though I think the latter).

All IMHO
by Paul 4/26/2011 5:51:38 PM

Agree with Paul, we haven't seen other parts painted yellow. Although the only cap we have actually seen up to now is only #4!! We have no clue about any of the other caps as for color or integrity from vids/pics. Some interesting questions, what is the containment cap made of and how would it fracture after a strong blast? Should we see large or small chunks? According to the design I saw several layers of really thick steel are used to plug the well on the service floor level, where would that go after the blast? In order for the cap to fracture and come out, those have to go first. This is a lot of heavy steel, it should have made a hole on the top of the building or shifted. On #3 the structure H-bars on top are still holding together in the middle.
by talisker 4/26/2011 5:58:07 PM

@talisker : the cap is concrete, it would be logical and maybe a rule to have all the same color, the metal structures on top of #3 are identified as the refuelling crane trails that went up into the air and came down on the reactor again. it is not an intact part of the roof. so the cap could have been ripped to pieces, gone up into the air, while the crane went strtaight back to the reactor.
by Edano 4/26/2011 6:04:02 PM

by Edano via Nationalpostnews.files.wordpress 4/26/2011 6:18:07 PM

@Edano yeah I would expect all of them to have the same color. But are you sure it's concrete? I looked at the making of video and other sources and it looks very much like steel (could be wrong)
by talisker 4/26/2011 6:20:31 PM

@talisker : i am sure but cannot proove it. i think a metal cap on concrete containment would put too much thermal stress on the bolts. it would not be clever.
stretchingminds.files.wordpress.com
by Edano via Stretchingminds.files.wordpress 4/26/2011 6:25:52 PM

@talisker the yellow domed cap is steel the flat plates that go over the reactor well are concrete slabs. I have a bunch of images of the inside of the reactor work floors. Would those help?
by Nancy 4/26/2011 6:27:08 PM

a BIG explosion picture for zoomers. www.elpais.com
by Edano via Elpais 4/26/2011 6:27:37 PM

@Nancy, as much I remember the yellow cap consists of layers of concrete and steal.

by Peter Melzer 4/26/2011 6:29:17 PM

@Peter Melzer I think your right and I think that is what is resting on top of #4 roof
by Tenzing 4/26/2011 6:32:00 PM

@Nancy Yes I meant the yellow dome, some images would be cool
by talisker 4/26/2011 6:32:32 PM

From nature.com, "The boiling water reactor (BWR) design used there is sealed with a solid stainless-steel cap that can only be removed by a heavy, fuel-loading crane located above the reactor. "
by Markfm 4/26/2011 6:33:37 PM

hmmm just googeling the cap material .... everybody says concrete ..... will go on.
by Edano 4/26/2011 6:33:59 PM

@Markfm : this could mean the vessel cap.
by Edano 4/26/2011 6:34:21 PM

@Edano concrete & steel
by Tenzing 4/26/2011 6:34:21 PM

It's definitely steel, it has holes for bolting and it looks like welded steel panels. I found this on a quick search but it's not a reliable source www.johndearmond.com
by talisker via Johndearmond 4/26/2011 6:35:39 PM

Yes, the vessel cap, the dome piece at the top of the RPV that bolts onto it, is what is SS.
by Markfm 4/26/2011 6:35:53 PM

Behavior of Radioactive Materials from Fukushima Daiichi Nuclear Power
Station obtained by Radiation Scan on the Expressways ccdb4fs.kek.jp
by Bobby1 4/26/2011 6:40:09 PM

Time to work - hope everyone enjoys their day :)
by Tenzing 4/26/2011 6:46:39 PM

Going to post a bunch of inside images of R3, hope they help www.houseoffoust.com
by Nancy via Houseoffoust 4/26/2011 6:57:02 PM

@Nancy "If it did indeed suck in the building first I think that is a sign of something rapidly eating oxygen first." The more precise the combination of H2 and O2, and the purity of them, will determine the amount of vacuum. In a perfect mix, all you have left after the flash is water and a collapsed container. This wasn't that mix, but that's an oxidation reaction so complete the only thing left but water is excess )2 and other gases in the chamber. or excess H2, in which it's just waiting for the post-explosion vacuum to suck in more oxygen.
by radioguy 4/26/2011 6:57:21 PM

by Nancy via Houseoffoust 4/26/2011 6:58:01 PM

by Nancy via Houseoffoust 4/26/2011 6:58:40 PM

found a book A guidebook to nuclear reactors but nothing about cap material.
books.google.de
by Edano 4/26/2011 7:06:39 PM

by Edano via Nationalpostnews.files.wordpress 4/26/2011 7:22:33 PM

@Nancy it is really helpful seeing it in pics like that
by elainekirk 4/26/2011 7:25:10 PM

Re the cap, the one in R4 can be seen pretty well @ 2:46 into this video... www.youtube.com

Some clues there?
by Paul 4/26/2011 7:28:58 PM

Disclose.tv - UFOs At Fukushima Reactor Tragedy? Video
ok this video is stupid for the UFO, but it is an interesting close up work on #1 explosion. www.disclose.tv
by Edano 4/26/2011 7:30:38 PM

Unit 4 roof object. I keep wondering if it might be material related to new shroud. I'm looking around for pics.
by Scilla 4/26/2011 7:34:14 PM

@Scilla I wonder the same thing about that. I tried to find out if the new shroud comes welded in a circle or not and didn't find anything so far. The stamped metal pattern didn't match another image of a shroud I had seen but that doesn't mean the new one wouldn't have a different imprint on the metal.
by Nancy 4/26/2011 7:38:32 PM

NHK story on resin spraying going into production use. "TEPCO plans to spray 1-million cubic meters of the agent on the 500,000-square-meter compound by the end of June." What am I missing? It sounds like they would be burying that under 2m of the spray resin.
by Markfm 4/26/2011 7:38:41 PM

@Nancy I'm zeroing in on the sound, and in the video you're right, one frame becore the explosion, the roof sucks down.
by radioguy 4/26/2011 7:39:09 PM

@radioguy cool, now to figure out why? :-) I don't know enough about explosions but what you mentioned about the chemical mixes of oxygen, water, hydrogen etc. I would love to be able to get an explosives expert to explain this. Maybe we should call mythbusters? :-)
by Nancy 4/26/2011 7:40:39 PM

Last night I mentioned a corridor betweeen 3 & 4 if I remember rightly it is on the 3rd floor if that helps radioguy
by elainekirk 4/26/2011 7:42:39 PM

The RADnet site is showing elevated readings for Amarillo, Texas. Cities around it are not near as high. Could be the Pantex plant. 60 tons of plutonium, nothing to worry about.
by Bobby1 4/26/2011 7:47:09 PM

On the shroud trail. www.sciencedirect.com
by Scilla 4/26/2011 7:47:35 PM

Core shroud replacement looks interesting, technically: www.toshiba.co.jp www.google.com www.google.com
by Markfm 4/26/2011 7:48:26 PM

new blueprint I found via Google.jp. Trying to track down some more info on it but looks like Fukushima and was on a page talking about Fukushima. Looks like someone took a picture with a phone camera. www.houseoffoust.com
by Nancy via Houseoffoust 4/26/2011 8:07:32 PM

www.anti-atom-piraten.de i see something round and yellow in the crippled building bottom left of the pcture. (btw. i have not seen this pic before).
by Edano via Anti-atom-piraten.de 4/26/2011 8:08:31 PM