Japan Earthquake

Japan Earthquake | Page 1583

@elainekirk Yes , I know this , but no one explaining why RCIC systems in the reactors failed after some time.
by Maxi 6/11/2011 9:41:56 AM

It would appear to be design failure once the pressure was lost it couldnt be restored , they lost battery back up at the start as the battery store was inundated and the deisel back up then failed and it just didnt survive on pressure alone as it should have
by elainekirk 6/11/2011 9:49:48 AM

@Maxi This Google-translated Asahi article discusses the possibility of valve failure leading to the explosions. translate.google.com
by es 6/11/2011 9:51:29 AM

Maxi gimme a min, it is an old article about the stuck valves.
by Ralph Unger 6/11/2011 9:54:07 AM

@maxi try this , the pumps needed to be turbine driven --- www.dailykos.com
by elainekirk 6/11/2011 10:01:10 AM

@elainekirk Yes, exactly , they don't need Electric power, but steem , at that time there was plenty of steam in the RPV. Only reason for this failure can be stuck valve, but I can't believe there was so silly design without workaround possibility
by Maxi 6/11/2011 10:04:30 AM

"Managers were worried about venting because it would release significant amounts of radioactive materials, but when they finally gave the order to do so — after being told to by the government — the workers found the venting system inoperable. With the power out, their commands from the control room did not open the valves. They then discovered that that radiation levels at one reactor were so high they could not attempt to manually open the valve. And at two other reactors, their attempts to open the valves failed, possibly because the equipment itself was damaged in the earthquake." www.nytimes.com
by Ralph Unger 6/11/2011 10:07:38 AM

@maxi but it says there the ricirculation pump needed a power supply
by elainekirk 6/11/2011 10:08:10 AM

@ralph thank you so much brilliant hunting
by elainekirk 6/11/2011 10:10:07 AM

@dean Oh good luck on your race! Dont break yourself though!!
by Angie 6/11/2011 12:08:26 PM

nuclearpoweryesplease.org a little reading material for RCIC
by dean 6/11/2011 12:11:17 PM

ha ha .. hi Angie, I won't as I just don't have the oooomffffff!!!! to go for a win today
by dean 6/11/2011 12:11:49 PM

@dean well you have more energy than me for even going!
by Angie 6/11/2011 12:13:17 PM

@Maxi, the Residual Heat Removal system and Reactor Core Isolation Cooling are complex systems to remove decay heat from the reactor. Two factors played into not having the RCIC system functioning,, first the loss of AC power, control room power etc which reduced the ablility for the operators to see much of what was happening, second, upon the reactor trip the steam turbine isolation valves shut to isolate steam to the turbine and the pressure reliefs in the RPV system lifted and filled the torus with steam which rendered it in affective at condensing to provide a flow source for the HCIC system, the HCIC is a passive system but it takes operator intervention to open the steam valves to operate the system and, after the battery banks (which didn't last as long as designed) dropped off, there was no power to operate the controls on valves etc. In addition, TEPCO admitted that one of the operators on unit 1 shut off the Emergency core cooling system over some concern about damaging the core.
by dean 6/11/2011 12:20:59 PM

ty Angie, last year I was in much better racing shape but over the winter and some health issues it's been a slow go
by dean 6/11/2011 12:22:29 PM

It's Saturday night in Fuku -- that's when they do the risky stuff, right? Stay tuned to the cams...
by bojack54 6/11/2011 12:26:08 PM

ty Angie.. I'll have my full report later,, I start in 1 1/2 hours and will need to prepare
by dean 6/11/2011 12:26:13 PM

Michio Kaku talks about the earless rabbit in Namie inthearena.blogs.cnn.com
by Bobby1 6/11/2011 1:04:07 PM

Morning all, looks like I am late to the party this morning. :-)
by lillymunster 6/11/2011 1:23:46 PM

Tokyo Kita-Ku Radiation 20110611 ～2 μSv/h www.youtube.com
by Bobby1 6/11/2011 1:24:21 PM

@lillymunster Morning to you! yes the boys have gone racing and fishing!
by Angie 6/11/2011 1:25:03 PM

@Bobby1 Is that higher than some of the other Tokyo citizen rad readings? I can't remember. Must need more coffee. :-)
by lillymunster 6/11/2011 1:26:09 PM

@lillymunster Yes, by a factor of 10... most readings are near the ground
by Bobby1 6/11/2011 1:27:02 PM

@Bobby1 I thought most so far were miliseiverts but less that one as in .02uSvh etc.
by lillymunster 6/11/2011 1:27:58 PM

I'm not sure what we should do to document these Tokyo readings? Maybe make a page and link to all the sources of info? Daily updates?
by lillymunster 6/11/2011 1:28:54 PM

@lillymunster there is a lot of info on twitter and the Japanese message boards, it's a lot of work to compile them
by Bobby1 6/11/2011 1:33:03 PM

@Bobby1 Since I don't follow it closely I am a bit lost on the data source. Aussie Cannonball mentioned maybe making a links page to all sources? Maybe that would be less ongoing work that trying to compile it all on an ongoing basis?
by lillymunster 6/11/2011 1:36:33 PM

@lillymunster There are links to prefecture radiation readings that can be posted, but Tokyo doesn't really have one, though they supposedly started recently.
by Bobby1 6/11/2011 1:38:53 PM

@Bobby1 There seems to be lots of unofficial rad readings being posted. I think they are as or more important than the official ones. Are they still doing official readings really high up in the air?
by lillymunster 6/11/2011 1:52:07 PM

@lillymunster The one official Tokyo site is at 18 meters. Most of the MEXT and a lot of the prefecture data is also from rooftops. It's hard sometimes to figure out which is rooftop and which is near the ground.
by Bobby1 6/11/2011 2:03:07 PM

@Bobby1 Is there any central source for citizen readings in Tokyo yet or would we need to compile that. I got the impression they are scattered around the web.
by lillymunster 6/11/2011 2:06:08 PM

@lillymunster This is one of the main Japanese board logsoku.com This one is for Geiger readings in Japan logsoku.com The problem is, you have to figure out which readings are from Tokyo. They also open a new thread every couple of days because they rapidly exceed 1000 replies.
by Bobby1 6/11/2011 2:11:40 PM

@Bobby1 Sounds like links are going to be the most logical then. I think Aussie Cannonball has some various links also. I will try to get a page started Monday and we can add to it as we go.
by lillymunster 6/11/2011 2:15:35 PM