Japan Earthquake

Japan Earthquake | Page 874

@all "An innovative BWR core has been proposed, which aims at a breeding ratio of 1.0 or more, as well as a negative void coefficient. This core is composed of 2 types of MOX fuel assemblies." www.jsme.or.jp
by smoss 4/28/2011 3:30:25 AM

Does anyone know why the EPA is has not posted data on air samples since the 23rd?
by inCalifornia 4/28/2011 3:51:45 AM

@E123 do you have a link for your Hawaii post?
by inCalifornia 4/28/2011 3:52:11 AM

I'm still watching the Jack Shannon whistleblower interview...

1. Department of Energy totally corrupt, no confidence in storing waste
2. Fatal radiation area around Schenectady, New York
3. US Navy sub reactors have no containment
4. US boiling water reactors have cracked shrouds
by Bobby1 4/28/2011 4:00:28 AM

Wednesday, April 27, 2011
Japan's Ministry of Health to Get Rid of Annual Radiation Limit for Nuclear Plant Workers

The normal limit of 50 milli-sieverts per year is to be eliminated, but 5-year total of 100 milli-sieverts limit remains.

If the limit is eliminated, the workers who will have been exposed to the radiation of more than 50 milli-sieverts but less than 100 milli-sieverts at Fukushima I Nuke Plant will still be able to work at other nuke plants, as long as 5-year total remains under 100 milli-sieverts. ex-skf.blogspot.com
by Majjham Zazen 4/28/2011 4:22:16 AM

Odd, why does NHK no longer list this article? I gotta question my source here but it wan an NHK new story a month ago, "New Radiation Limits Raised 500% for Fukushima Plant Workers" "The radiation exposure limit for workers at nuclear power plants is 100 milli-sievert/year, but the limit has been raised to 250 milli-sievert/year to deal with the Fukushima I Nuke Plant accident. According to the government sources, the higher limit is being considered because it is getting increasingly difficult to have enough workers to work on the plant. Also, the radiation inside the Reactor buildings is high, and the annual limit of 250 milli-sieverts may not be high enough to achieve the goals laid out by the TEPCO road map." theintelhub.com
by Ralph Unger 4/28/2011 4:36:11 AM

I found it "Japan raises radiation exposure limit" www3.nhk.or.jp
by Ralph Unger 4/28/2011 4:42:57 AM

This seems to disagree with this more recent article. "Japan to scrap workers' annual radiation dose limit at normal times" "Under Japanese law, nuclear workers cannot be exposed to more than 50 millisieverts in one year and more than 100 millisieverts over five years." english.kyodonews.jp
by Ralph Unger 4/28/2011 4:52:49 AM

@all this article is from 3/15/2011 but as I read it found info I had not heard before. If it's already been discussed feel free to delete. "Hydrogen leaking from the pond caused yet another explosion this morning at reactor unit No. 4, TEPCO said, according to the Epoch Times, which led to a fire." Thought the claim was damage done by fires? hadn't seen anything on #4 explosion www.bellona.org
by ch 4/28/2011 5:29:11 AM

@ch I remember talk of an explosion at R4 back then, but a week or so ago people were asking about it and none of us could find the reference.
by radioguy 4/28/2011 5:36:13 AM

@ch Yet another explosion means at least 2 of them.
by Bobby1 4/28/2011 5:37:26 AM

@ch @radioguy I thought there was only one.
by Bobby1 4/28/2011 5:38:02 AM

The first was what damaged the building, right?
by radioguy 4/28/2011 5:38:20 AM

and then there was that same kind of thing ch is quoting there about another explosion, but it was in off camera hours or something and never heard again.
by radioguy 4/28/2011 5:39:05 AM

@radioguy There was speculation that there was another explosion in #3.
by Bobby1 4/28/2011 5:40:06 AM

@Bobby1 That might explain that big concrete arc on R4's roof. It crumpled the framing as it rolled and pushed it aside.
by radioguy 4/28/2011 5:42:38 AM

@radioguy But what would cause 2 explosions in #4, with only the SFP in play?
by Bobby1 4/28/2011 5:47:14 AM

Wasn't some one wondering where the huge highly radioactive piece of concrete came from?
by ch 4/28/2011 5:50:09 AM

Sorry- enter key- TEPCO said later in the day the massive radiation amount of 400 millisievert per hour, or 400,000 microsievert, was recorded around debris in front of the No 3 reactor and that the material may have come from the nearby No 4 reactor. Could this be an answer? www.bellona.org
by ch 4/28/2011 5:52:33 AM

@ch There was a 900-millisievert piece next to #4 that they said came from #3.
by Bobby1 4/28/2011 5:54:08 AM

@ Bobby1 Maybe thats backwards. If 4 exploded is it possible thats where it came from?
by ch 4/28/2011 5:56:24 AM

@ch Possible but why would the concrete be so radioactive if it came from #4? This would be right at the beginning. Fuel rods on the floor after the quake?
by Bobby1 4/28/2011 5:58:46 AM

@ Bobby1 "But more radiation headaches are arising from the spent fuel containment pool at Fukushima Daiichi’s reactor unit No. 4.

TEPCO said the water level in the pool storing the spent fuel rods at the Fukushima Daiichi's nuclear plant's No. 4 reactor may have dropped, exposing the rods.

The firm said it has not yet confirmed the current water level or water temperature in the pool and will try to pour water into the facility from Wednesday through holes that were created following an explosion earlier Tuesday in the walls of the building that houses the reactor.

Unless the spent fuel rods are cooled down, they could be damaged and emit radioactive substances. The government's Nuclear and Industrial Safety Agency urged TEPCO to inject water into the pool soon to prevent heating of the fuel rods.

“This is very serious because the fuel is outside of any kind of containment,” said Bellona’s Bøhmer. “This will lead to excessive radiation and have a severe environmental consequences and put further radiation out into the atmosphere.”

Bøhmer pointed out that the boiling spent fuel ponds ratchet up the danger to humans.

“Particularly, this increases radiation to which people could be subjected,” he said. The burning radioactive elements would release caesium, strontium, uranim and perhaps plutonium

[Some mysterious totally blank line feeds here bobbitized (snipped off) to conserve screen space. Thanks. - Alblee]
'
by ch edited by alblee 4/28/2011 6:02:04 AM

Unit 4 explosive sound - 3/15/2011
See www.tepco.co.jp -
past Progress attachment, link at bottom
- At approx. 6:00am, March 15th, an explosive sound was heard and the damage in
the 5th floor roof of Unit 4 reactor building was confirmed. At 9:38am, the fire near the northwest part of 4th floor of Unit 4 reactor building was confirmed. At approx. 11:00am, TEPCO employees confirmed that the fire was extinguished.
- At approx. 5:45am on March 16th, a TEPCO employee discovered a fire at the northwest corner of the reactor building. TEPCO immediately reported this incident to the fire department and the local government and proceeded with the extinction of fire. At approx. 6:15am, TEPCO employee confirmed at the site that there were no signs of fire.
by Deirdre 4/28/2011 6:08:28 AM

@Deirdre Explosion #2 was on the 15th. Was it before the 1st fire at 9:38?
by Bobby1 4/28/2011 6:12:07 AM

@ Deidre ty missed that one. Any idea when the 2nd explosion occurred? And do you know-is the SPF in the NW corner? what floor-3rd or 4th?
by ch 4/28/2011 6:13:47 AM

@Deirdre Thank you very much for your earlier post discussing the multiple isotope disclosure by TEPCo. I tried the link, but for some reason I could not open the pdfs. Could you possibly copy and post the measured levels of the elements here? Thank you.
by Reed 4/28/2011 6:14:09 AM

Per the summary report, the "explosive sound" was heard at 6:00 am 3/15, then later at 9:38 3/15 a fire was confirmed. Probably a good idea to cross check against other summaries.
by Deirdre 4/28/2011 6:16:52 AM

@ Deidre This was first I'd heard of actual explosion. Other ref. had just mentioned fires. I will keep looking. Thanks
by ch 4/28/2011 6:20:29 AM

www.rchoetzlein.com
by Reed via Rchoetzlein 4/28/2011 6:23:09 AM

It could be that the 6:00 am explosion was the second explosion.
by Bobby1 4/28/2011 6:27:39 AM

@Bobby1 @Deirdre @ch This is a good incident timeline to use a a reference. Unit #4 had only one explosion but two fires as far as I know.
by Reed 4/28/2011 6:30:24 AM

@Reed "Yet another explosion" might mean yet another reactor exploded. But it might explain debris found that some thought was from #3.
by Bobby1 4/28/2011 6:33:18 AM

Thanks, @Bobby1, @Deirdre, @ch, @Reed, this is what the blogroom is such a good thing for --> for lurkers in the know (read, Tepco insiders, etc) to have an opportunity to share and clarify information. So, was it 2 blasts, or 1? Time for some edification. :o) Thanks.
by Alblee edited by alblee 4/28/2011 6:33:29 AM

Soil Report #5 - Gamma ray nuclide analysis
www.tepco.co.jp
by Deirdre 4/28/2011 6:39:43 AM

Aha found it! #4 - ist explosion 3/15 @6am, 2nd explosion 6:14am .Thanks @Reed www.rchoetzlein.com
by ch via Rchoetzlein 4/28/2011 6:45:15 AM

Soil Report #5 - Plutonium analysis
www.tepco.co.jp

Soil Report #5 - Am and Cm analysis
www.tepco.co.jp
by Deirdre 4/28/2011 6:45:17 AM

The Te-132 is new, it could be blowing off of #3. I saw smoke coming from there today, it is still active.
by Bobby1 4/28/2011 6:50:34 AM

@Jim Carver I feel the same way. Hard for me to remember which reactor had what event on which day, with what results. This site is so wonderful "to ask and ye will receive" Somebody here usually has the specifics or knows a reference. Thanks to all for their continued dedication.
by ch 4/28/2011 6:50:36 AM

@ Deidre I'm confused. Isn't that soil sample from 2009? or are my tired eyes misreading it?
by ch 4/28/2011 6:55:30 AM

@ch Yeah, I 've been at this since reuters and I STILL don't have a good handle on it. They keep changing it. That's why I grimace sometimes when I'm asked to save something. They'll just say they were wrong before and it doesn't matter. One thing I will hold Tepco to is if they admitted something. Because they are so conservative they wouldn't let something out even if they decided to refute it later. So I do believe something they admitted in the past. The other stuff is up for grabs.
by Jim Carver 4/28/2011 6:56:09 AM

Ok #4 SFP they admitted has a leak.
by Jim Carver 4/28/2011 6:57:51 AM

@Jim Carver Totally agree with you on that one. Trouble is once I've read it (even if I saved it) I can't find it. Didn't help me much when my computer crashed(teenagers_Rrrrr) and I lost all my files from first 4 weeks.
by ch 4/28/2011 7:00:42 AM

@ch Not good. Sorry. ..We need to get down what we know and I've had to go over the same old ground that I confess, I have to question myself sometimes. So, anything other than the leak in pool 4 you can think of? As i recall they say the reactor is okay except for those out of sight radiation reading which may be caused by a sensor failure...?
by Jim Carver 4/28/2011 7:04:45 AM

@Jim Carver Now that I know of #4s explosion- was wondering -could that have damaged the SFP directly or possibly weakened the supports to it enough to eject/tip out (not sure how to word it) I conjure up a pic in my head of the supporting floor and wall being so weakened that the pool is no longer level. Tepco did say they wanted to go under it to shore it up, right? Isn't there hotspot in or close to reactor on thermals? I'm not so good at piking stuff out of the pics. Glad Nancy is. Sorry getting tired does this make any sense?
by ch 4/28/2011 7:14:00 AM