Japan Earthquake

Japan Earthquake | Page 1236

Red wine calls. See you@all later. @wtm going to be in Europe for three weeks. I'll be spending almost half of the next year away. It's something. But Japan is still home for now. Mata.
by bo 5/17/2011 7:26:05 PM

@Bo, you can go down to the local open air market and pick up fantastic wines from all over Europe for cheap !! Enjoy !!!
by wtm 5/17/2011 7:29:55 PM

@bo Make sure you get some red wine from Alentejo region in Portugal. They're great and quite affordable. If you go to Nice in the end of the month, beginning of June I'll be there in a pub performing with a band. Look for J Rocks cover band. Enjoy your trip... and the red wine.
by Pedro Jesus 5/17/2011 7:32:00 PM

jay most nuclear facilities have to monitor the concrete temps around the annulus between the reactor pressure vessel and concrete to ensure the concrete doesn't over heat. I'm not certain about the concrete containment but imagine they have temp sensors,,, perhaps not on the building concrete floors tho..
by dean 5/17/2011 7:51:56 PM

no elaine,. I don't have those options things below my text window to do that
by dean 5/17/2011 7:54:33 PM

the time is in minutes,,, and the bottom two lines at 21 and 22 should read Drywell and Wetwell electric penetrations start to leak at T=204C - 400F and Drywell and Wetwell electric penetrations decompose and blow out of containment at T=260C - 500F
by dean 5/17/2011 7:57:07 PM

Hi all! Is anybody looking at cam now? There appears to be something bright within 4... Not sure what I'm seeing.
by LM 5/17/2011 7:57:27 PM

@LM: R#4 is kinda opaque. What you are seeing is sunlight from the other side of reactor :)
by Optim 5/17/2011 7:59:37 PM

@Optim. You're right about it being opaque but the smoke is now more visible. Perhaps I was seeing steam within.
by LM 5/17/2011 8:02:11 PM

@dean is that your chart you mean? when @Nancy comes on we ned to ask her to host it so I can add it to your pin then you can add explanation
I am going to try sort your access out again I may be gone awhile this is flummoxing me
by elainekirk 5/17/2011 8:09:42 PM

so we agreed there is nothing but concrete between bedrock and corium ?
by Edano 5/17/2011 8:14:03 PM

OK.. also elaine it will be part of my write up.. I just wanted to see what folks thought
by dean 5/17/2011 8:14:54 PM

If the concrete goes all the way to bedrock, to me that is better than intervening air/water -- reduce possibility of a steam flash.
by Markfm 5/17/2011 8:15:07 PM

as I understand things.. yes Edano.. HEAVY rebar concrete.. probably high strength concrete
by dean 5/17/2011 8:15:40 PM

@dean : your chart implies that corium began melting through secondary containment 185 hours after scram in #1 ? is this correct ?
by Edano 5/17/2011 8:16:19 PM

Self-entombing option -- corium melts down into the bedrock, cap it when things cool?
by Markfm 5/17/2011 8:16:36 PM

Edano yes based on the assumptions above for each case.. case 1 was station blackout, and no emergency core cooling
by dean 5/17/2011 8:18:23 PM

Ahh, hours, not minutes... (couple hours back you indicated minutes)
by Markfm edited by Markfm 5/17/2011 8:18:48 PM

@dean : thank you dean your chart is very impressing. it leads to certain consequences.
by Edano 5/17/2011 8:19:41 PM

then we have to face the fact that corium probably has already left the containment.
by Edano 5/17/2011 8:22:42 PM

@Edano t'hen we have to face the fact that corium probably has already left the containment.' crikey what a thing to read when I log on.
by UKVal 5/17/2011 8:28:23 PM

@UKVal : look at dean's chart above. the numbers are hours after scram.
by Edano 5/17/2011 8:29:18 PM

@elainekirk re 'Special Messages' As I understand it TEPCO are required to report after any significant earthquake. I've seen a few more recent reports like that
by UKVal 5/17/2011 8:29:39 PM

@Edano sorry just read your post properly - still a bit shaken by reading your post below OH hell - so it's all done for?
by UKVal 5/17/2011 8:32:09 PM

"The fast erosion phase of the concrete basemat lasts for about an hour and progresses into about one meter depth, then slows to several centimeters per hour, and stops completely when the melt cools below the decomposition temperature of concrete (about 1100°C). Complete melt-through can occur in several days even through several meters of concrete; the corium then penetrates several meters into the underlying soil, spreads around, cools and solidifies" en.wikipedia.org(nuclear_reactor)
by Edano 5/17/2011 8:33:30 PM

Edano.. there are electrical penetrations through the concrete containmant that are breached.. that's the notes at the bottom of the table
by dean 5/17/2011 8:33:42 PM

I don't want to ask people to repeat stuff posted earlier. I assume what happens next depends on whether the corium hits sufficient water to cause an explosion or whether it forms a hard crust as it cools on the outside ...
by UKVal 5/17/2011 8:34:39 PM

@lm there is a lot of smoke isn't there , so much for the 100t of water they poured in the sfp yesterday
by elainekirk 5/17/2011 8:35:18 PM

@Edano -sorry your post arrived after I'd pressed enter...
by UKVal 5/17/2011 8:35:23 PM

@UKVal : i don't think anyone else here understood the consequences.
by Edano 5/17/2011 8:35:30 PM

Drywell electric penetration assembly seals have failed as
the containment temperature exceeds 204°C (400°F) and start
to vent through the primary containment at a leak rate of
118 SL/s (250 ft3/min).
by dean 5/17/2011 8:36:35 PM