Japan Earthquake

Japan Earthquake | Page 2367

@ Vivre, generally speaking a nuclear power plant 'stack' design combined with the HVAC cleansing system is designed to delay discharge of the offgas from the NPP with the intent of allowing the maximum decay of radioisotopes prior to leaving the facility up the stacks.
by dean 9/19/2011 1:57:00 PM

hope that worked @ lilly... @ Virve i am watching the video
by dean 9/19/2011 1:59:42 PM

Going to post and run (sorry), but this is a very good and detailed analysis. They seem to be a bit too sure of their times, in a way... netfiles.uiuc.edu
by M.I.A. 9/19/2011 2:02:53 PM

@lillymunster
thanks - I didn't catch that there will also be a cleansing system installed - good to know

ps: did you see my small comment about the 'GreenPeace Fukushima Seafood Results' ? It's also available as direct download: www.greenpeace.org
by Vivre 9/19/2011 2:03:13 PM

@ all,, time to run to office.. will come on there... ty for all the inputs
by dean 9/19/2011 2:05:36 PM

@All Interesting factoid: There were 6415 workers on site @Time of LOCA, of which 5500 were subcontrators. netfiles.uiuc.edu
by M.I.A. 9/19/2011 2:10:31 PM

@ lilly, one thought, "assuming" the fuel melt generally formed a solid mass and then slumped to the bottom head of the reactor, it would be interesting to know, assuming the entire 90 tons were together, how far up the RPV wall that mass would reach. .
by dean 9/19/2011 2:10:40 PM

@Vivre yes. Grabbed that link and put it on the greenpeace story
by lillymunster 9/19/2011 2:10:42 PM

@dean TEPCO did a test on the control rods in one of the reactors, maybe unit 1? They looked to see what sensors etc. still worked in some manner. They said that only one thing still worked giving the impression the rest is damaged or gone.
by lillymunster 9/19/2011 2:12:11 PM

@ lilly, I wondered about that so called test and questioned it. None the less, they came to the conclusion I would have
by dean 9/19/2011 2:13:31 PM

Does anyone know if that supression chamber level of the building has any sort of air lock like containment does? I know the entry into the metal torus tube has an airlock style hatch. But I have not found anything showing the concrete supression chamber level is sealed in any way.
by lillymunster 9/19/2011 2:14:32 PM

i want to add that every vibration (quake) would cause corium to spread and get flatter (thinner). it is like pouring thick concrete and then you have to rattle to make it flow.
by Edano 9/19/2011 2:15:45 PM

I had mentioned that a shaking or quake could open the crust and allow more oxygen in to reheat the corium @ Edano and lead to more relocation potential
by dean 9/19/2011 2:18:14 PM

we call it flow and creep with plastic materials.
by Edano 9/19/2011 2:18:30 PM

ooh cool French video of a melted corium experiment! www.irsn.fr
by lillymunster 9/19/2011 2:20:14 PM

@Edano, I was thinking,,, take a larger test tube and drop a blob of molten glass to the bottom and then see how things work out... that's kind of like fuku,,, @ lilly that video is pretty good
by dean 9/19/2011 2:24:02 PM

I noticed something reading the french corium article. They mention additional hydrogen produced by concrete-corium reactions. Back in maybe June-July TEPCO started taking actions to lower the chance of additional hydrogen explosions. They injected nitrogen into what is left of the containment on reactors. I wonder if there was increased hydrogen due to the concrete burning at that point..
by lillymunster 9/19/2011 2:36:22 PM

@audi-tek has posted a lot of interesting news on organise
by elainekirk 9/19/2011 2:36:30 PM

did you see the schools link ? translate.googleusercontent.com
by elainekirk 9/19/2011 2:58:03 PM

@elainekirk yes. They are still using the 100msv benchmark to boot. I have a couple of other school related links, will probably work them into an article with this one.
by lillymunster 9/19/2011 2:59:53 PM

I don't know which is worse to be honest exposing children to radiation to stop them becoming obese or adding a wee qualifier that all the airplane/xray/sun charts exclude inhaled radiation
by elainekirk 9/19/2011 3:01:49 PM

and I also found the EARTH handbook ... fortunately for my blood pressure I cant translate it translate.googleusercontent.com
by elainekirk 9/19/2011 3:04:57 PM

mainichi.jp
Further traffic in and out of the zone translate.google.com
by elainekirk via Mainichi.jp 9/19/2011 3:08:50 PM

look at that they have taken a carpet up that must have collected a ton of radiation wearing only paper masks!!!!!!!!!! the world has gone mad
by elainekirk 9/19/2011 3:12:04 PM

@you, my guess would be more flowability of Fuku, but that's just guessing, I'd defer to Dean.
by Ian 9/19/2011 3:15:07 PM

I think enough tepco radiation is dispersing in our oceans for 'of' to be applicable
by elainekirk 9/19/2011 3:17:37 PM

@Ian quakes may have broken things open, moved them around. Edano's shaken concrete description makes sense. We see so little steam anymore it makes me wonder where the corium really is.
by lillymunster 9/19/2011 3:21:49 PM

@lillymunster, and I also can't help but wonder about the very low drywell radiation and if that means the corium as left the building. Even when the corium was solidified at Chernobyl, the radiation coming off the hard corium was astronomical. Yet the levels in the drywells are, as I've heard, almost equal to the secondary containments. How could that be possible? Maybe Tepco's radiation-level data is fake. Of all things to fake, that would be a likely candidate.
by Ian 9/19/2011 3:27:33 PM

Harness of corium won't stop beta or gamma radiation emitted from within the whole mass, and not alpha emitted from its surface.
by Ian 9/19/2011 3:29:53 PM

this is from the photo dump and I reckon that is a steam jet to the left of the red crane plus some around reactor building and those pics are only days old
by elainekirk 9/19/2011 3:29:55 PM

@me, a mass of corium would probably stop some beta emitted from within it.
by Ian 9/19/2011 3:32:40 PM

@elainekirk, so maybe the steam cracks is true. But we need more data, perhaps that photo just shows a fog bank with variable thickness passing through. ?? Could workers be right there working those cranes with steam from a China Syndrome coming out near them? Maybe the steam itself wouldn't be lethally radioactive. ??? questions questions
by Ian 9/19/2011 3:35:36 PM