Japan Earthquake

Japan Earthquake | Page 1694

@dean I always thought that was the chronology. Explosion on #1, blast on #3, then OMG we'd better knock a panel out in #2.
by radioguy 6/19/2011 10:34:23 PM

Worst case source term for Fukushima reactors (not spent fuel) compared with other nuclear disasters
Strontium-90 (becquerels)
Fukushima 171,000,000,000,000,000
Atmospheric nuclear testing 700,000,000,000,000,000
Chernobyl 8,000,000,000,000,000,000
by Edano 6/19/2011 10:35:51 PM

@Dean, earlier in the day you mentioned
by Peter Melzer 6/19/2011 10:40:00 PM

@dean : i posted some pictures below that suggest that there is a door in #2 images.scribblelive.com
by Edano 6/19/2011 10:40:02 PM

3 times 10-15 is what I found..
by dean 6/19/2011 10:40:06 PM

be back need to go outside
by dean 6/19/2011 10:40:11 PM

by Edano 6/19/2011 10:40:47 PM

@Dean, earlier in the day you mentioned the isolation cooling system. I found this on a wiki for BWRs:
"This system is often driven by a steam turbine, and is used to provide enough water to safely cool the reactor if the reactor building is isolated from the control and turbine buildings. As it does not require large amounts of electricity to run, and runs off the plant batteries, rather than the diesel generators, it is a defensive system against a condition known as station blackout. Had the Fukushima Daiichi plant in Japan had this feature, the nuclear meltdowns there would have been avoided." The source is here: en.wikipedia.org . GE is saying this on their blog as well. But I cannot find a reference that supports this claim. Perhaps one can search the wall panel holes in unit 3 and to identify the tanks that belong to this system as shown in the schema of Oyster Creek.
by Peter Melzer 6/19/2011 10:47:55 PM

Hi - Been very busy for last week. Have really missed you all & this blog. How on earth do I catch up with 8 day's worth of news /info??
by UKVal 6/19/2011 10:54:44 PM

@Peter Melzer Is that the "IC" system?
by lillymunster 6/19/2011 10:56:27 PM

@UKVal Hi and good to see you :)
by es 6/19/2011 10:56:37 PM

@es Hi :) ! Hi Elaine. Lily, Dean, Edano, Peter & everyone..
by UKVal 6/19/2011 11:00:22 PM

The discussion about #4 having equipment exposed. There were mentions somewhere along the line that some reactor equipment was stored in the SFP. That it was stored on top of the rod assemblies to keep it shielded etc. The video of #4 never showed any of this gear but there was also not a 360 view of the pool in the video. So it might be those parts that were mentioned? Why filling the reactor and tool pool was needed I am not sure unless they were trying to do the same to things in there?
by lillymunster 6/19/2011 11:03:17 PM

Hi UKVal, good to see you stop by.
by lillymunster 6/19/2011 11:03:39 PM

@lillymunster : i think they referred to the equipment pool.
by Edano 6/19/2011 11:05:32 PM

can anyone tell me what the object looming above 1 is on the TBS cam. Looks wider than a crane. It doesn't appear on the TEPCO cam pic probably because it's out of shot.
by UKVal 6/19/2011 11:07:04 PM

@Edano I read it as 'equipment pool 'too although I can't say I'd heard of such a pool before
by UKVal 6/19/2011 11:09:37 PM

www.tepco.co.jp
@UK They're constructing a cover of sorts for Unit 1
by es via Tepco.co.jp 6/19/2011 11:11:30 PM

@UKVal : yes it is on the other side of the reactor well:
equipment pool - reactor well - spent fuel pool
by Edano 6/19/2011 11:12:22 PM

Gavins Point releases down to 150,100 from 150,300. Inflow dropped to 149,000 from 152,000. Bad news, the entire area around here is expected to get rain. us.vocuspr.com
by lillymunster 6/19/2011 11:12:34 PM

@Edano @es ty for info.
by UKVal 6/19/2011 11:13:16 PM

www.chrismartenson.com one side sfp, other side equipment pool, all flooded with water.
by Edano via Chrismartenson 6/19/2011 11:15:03 PM

equipment pool left
by Edano 6/19/2011 11:18:48 PM

@Edano ty for graphics - I can make sense of it now. Much appreciated
by UKVal 6/19/2011 11:19:47 PM

@UKVal :)
by Edano 6/19/2011 11:20:15 PM

back
by dean 6/19/2011 11:21:38 PM

i see the posts Edano.. good job
by dean 6/19/2011 11:22:16 PM

@dean @dean : i think #2 had some kind of door at the working elevation.
by Edano 6/19/2011 11:23:56 PM

I do as well Edano from what I've been able to get info on .. also that comment about when 3 blew,, maybe the pressure shock opened that door
by dean 6/19/2011 11:25:38 PM

Edano.. did you get the source term info alright?
by dean 6/19/2011 11:26:59 PM

@dean yep, i never believed it would be easy to knock out a concrete panel.
by Edano 6/19/2011 11:27:05 PM

@dean thank you for the term, dean, i immediately found answers:
"Dr. Saji recently calculated that the accidental source term (the inventory at shut down, which could be released if all the reactors blew up) for Fukushima Daiichi units 2-5 is 2,649 PBq for strontium-89 and 171 PBq for strontium-90. (What is PBq? It is 1.0 x 1015)."
www.idealist.ws
Worst case source term for Fukushima reactors (not spent fuel) compared with other nuclear disasters
Strontium-90 (becquerels)
Fukushima 171,000,000,000,000,000
Atmospheric nuclear testing 700,000,000,000,000,000
Chernobyl 8,000,000,000,000,000,000
by Edano 6/19/2011 11:28:15 PM

At Daiichi 1, 2 and 3, the steam-driven HPCIs were left as the only cooling system, which eventually heated the units' toruses to the point that they stopped working. Pressure from the reactor vessels built several times to the point that it required release.
by dean 6/19/2011 11:30:10 PM

i wonder that the worst case source term for 1 unit in chernobyl should be higher than the source term for 3 units in fukushima .....
by Edano 6/19/2011 11:30:18 PM

@ Peter, is this the system you were refereing to?
by dean 6/19/2011 11:30:29 PM

those terms get so big @ Edano,,,, tera=1 trillion, peta=10-15 or quadriooion, exa=10-18 or quintillion, zetta=10-21 or sextillion, yotta=1--24 or septillion
by dean 6/19/2011 11:33:36 PM

Regarding Iodine-131, the picture is relatively homogeneous. A source term of 1017 Bq per day would explain the measurements in Takasaki as well as Sacramento. The total 4-day emission of 4 1017 Bq is on the order of 20% of the total emissions of Iodine-131 that occurred during the Chernobyl accident. Regarding Cesium-137, the situation is a bit different. In the cloud eventually propagating to the United States, the ratio of Iodine-131 to Cesium-137 was about 30. This is similar to the Chernobyl accident. In Takasaki, however, this ratio was four. This would indicate a much larger Cesium-137 release in the second two-day period after the accident. Taking this together, the source terms would be about 3 1015 Bq during the first two days, and 3 1016 during the second two-day period. In sum, this could amount to about 50% of the Chernobyl source term of Cesium-137.
by dean 6/19/2011 11:36:41 PM

atomicpowerreview.blogspot.com link for some comparisions for fuku to chernobyl
by dean 6/19/2011 11:38:33 PM

Webpage and pre-conference info for this week's IAEA Ministerial Conference on Nuclear Safety: www.iaea.org

Linx offers free transmission of the IAEA opening session of the IAEA Ministerial Conference on Nuclear Safety in Vienna. Opening session live signal will be available from 0745 to 1100 GMT on Monday, June 20th, on Eutelsat W2A. Parameters and additional details can be found at: www.linxproductions.com
by es 6/19/2011 11:40:15 PM

As the Missouri River rises, the Nebraska Public Power District has declared a “Notification of Unusual Event” for the Cooper Nuclear Station. The notification was made at 4:02am Sunday. It is part of the safety and emergency preparedness plan that the station follows when certain flooding conditions are present. [...]

A Notification of Unusual Event is the lowest and least serious of four emergency classifications established by the Nuclear Regulatory Commission for nuclear power plants.

The Cooper Nuclear Station is three miles southeast of Brownville, Nebraska along the Missouri River.
by dean 6/19/2011 11:40:44 PM

Hi Dean - I'm alive and having trouble keeping up with the forum.
by George Gibb 6/19/2011 11:53:47 PM

hi George.. it's sure good seeing you
by dean 6/19/2011 11:56:40 PM

Its just been crazy - 8 of us managing the installation of 1.1 billion dollars worth of communications infrastructure.
by George Gibb 6/19/2011 11:59:53 PM