Japan Earthquake

Japan Earthquake | Page 845

@all have you guys seen this page? atmc.jp this is stating reactor pressure, but is not a linked URL on the site. Any comments? over 5000Sv? Dean?
by mexico_lurker 4/25/2011 9:27:54 PM

www.telegraph.co.uk Chernobyl recovery officer criticises Japan's efforts at Fukushima
by e123 4/25/2011 9:28:42 PM

@mexico sorry you have been waiting I must condense the pinned stuff because I cannot see the mod queue when watching the convo I will try to be more vigilant you are now on auto post
by elainekirk 4/25/2011 9:29:08 PM

www.nisa.meti.go.jp Looks kinda low given other sources.
by Ralph Unger 4/25/2011 9:29:32 PM

2015.0 μSv/h at north side of building. that is kinda what I expected to see.
by Ralph Unger 4/25/2011 9:31:41 PM

@elainekirk Good question, I've been wondering what happen to fitter, wasn't there an issue with a NPP close to fitters home?
by Tenzing 4/25/2011 9:31:57 PM

To me those cryptome photos show a circular object landed on the roof of 4, then it broke up & some went down into the building. Could be the concrete cap - but looks a bit small - or a large part of the yellow cap?
by UKVal 4/25/2011 9:32:04 PM

Dean, yes wasn't there an issue in Virginia with a Nuclear Power Plant? I remember fitter talking about a warning on the radio
by Tenzing 4/25/2011 9:34:37 PM

@elainekirk can we pin that up top? I think fitter is a she actually.
by Tenzing 4/25/2011 9:35:20 PM

Tenzing.. I think there was some shutdown of a reactor but not sure the details
by dean 4/25/2011 9:36:47 PM

It is very clear that the blast was caused by hydrogen,Maybe some criticality was involved but the combustion was hydrogen.
by Ralph Unger 4/25/2011 9:37:39 PM

@ Tenzing - I'm glad you're thinking along the same lines as I haven't managed to arouse any interest. I also think the dates on some of the cryptome photos are the wrong way round. If you look you can see a sequence of the roof of #4. The only problem is the arial photo that shows a clean roof on 4 after an explosion at 3. So either that photo is manipultated or there were 2 separate events at 3.
by UKVal 4/25/2011 9:37:46 PM

UKVal I think we should move to the other board, see you there :)
by Tenzing 4/25/2011 9:41:22 PM

I did not look at the video though as apples are not oranges.
by Ralph Unger 4/25/2011 9:42:09 PM

@ Tenzing - yes you're right -see you on the other side
by UKVal 4/25/2011 9:42:15 PM

@Ralph Unger @dean I don't find that the two explanations are either or. The R1 explosion is a big, wide whoomphy pow. The R3 is a sharp report straight up. I'd say it was containment which held long enough to build pressure then blew with a sudden, sharp bang. Both could have been hydrogen and oxygen, R3 just a better mix, and inside the compromised containment. Prompt criticality could have ignited it. In fact, the pressurized explosive mix could have been augmented by such a criticality as well.
by radioguy 4/25/2011 9:43:26 PM

Good point and I must agree, perhaps the containment (dry well) , not the building, was the source of the R3 explosion.
by Ralph Unger 4/25/2011 9:45:31 PM

what would happen in #3 if the control rods hadnt inserted properly?
by elainekirk 4/25/2011 9:46:57 PM

It would be a simple matter to calc the energy of a hydrogen explosion compared to that of a nuclear bomb. My gut knows that it's purely academic however. If it was nuclear the camera wouldn't even be left.
by Jim Carver 4/25/2011 9:47:24 PM

@Ralph Unger that's what I've been wondering. There were reports that stated TEPCO used hydrogen for cooling quite often - long before the earthquake. I'll see if I can find the reports again - I remember Nancy was really pissed off about it.
by Tenzing 4/25/2011 9:47:59 PM

Hydrogen gets mixed into the water used, in order to minimize problems with the type of stainless steel used. I looked it up last week, it is not some tepco-specific thing.
by Markfm 4/25/2011 9:54:20 PM

Hydrogen is produced by the burning of zirconium cladding. I looked it up last week.
by Ralph Unger 4/25/2011 9:55:14 PM

@Markfm That's right, it makes the atmosph
ere less corrosive.
by Jim Carver 4/25/2011 9:55:57 PM

It also gets produced when things go wrong, as ralph noted, unplanned.
by Markfm 4/25/2011 9:57:23 PM

Hydrogen is also produced by water in the presence of massive radioactivity.
by Ralph Unger 4/25/2011 9:57:25 PM

It's not used for cooling and only used in normal operation.
by Jim Carver 4/25/2011 9:57:29 PM

Apologies, I did not mean it was used to cool, just that under normal ops they mixed out into the water, that was how they got it there, based on the article I chased down.
by Markfm 4/25/2011 9:59:09 PM

Mexico_lurker Where in the atmc site are you getting that info on unit 4? I'm only seein units1-3, & 5,6.
by marie rich edited by Markfm 4/25/2011 10:00:03 PM

@Markfm You didn't say it was used for cooling, some one else made that errorneous assumption.
by Jim Carver 4/25/2011 10:01:10 PM

Pretty sure I put the link in on friday, though maybe it was thursday.
by Markfm 4/25/2011 10:02:25 PM

Ty Mark, I think like most of the people on this board, we do not look at all the posts from the past.
by Ralph Unger 4/25/2011 10:03:40 PM

@all Dumb question, but what's the difference between a large hydrogen explosion in a nuclear reactor and a 'hydrogen bomb' (H-bomb) explosion? They use similar terms, but i'm sure in reality the machanisms involved are nothing alike... right?
by jay 4/25/2011 10:04:03 PM