Japan Earthquake

Japan Earthquake | Page 753

@Edano I'm looking at the blueprint of 1 and the upper building is not square. www.houseoffoust.com
by Nancy via Houseoffoust 4/18/2011 5:42:07 PM

@edano, I would imagine you are looking at the specs for the foundation, could they house both the reactor and turbine buildings?
by Mexico_lurker 4/18/2011 5:43:14 PM

@Jocelyn Mayer basement is square upper building is not.
by Nancy 4/18/2011 5:43:27 PM

@Pedro or @Anybody know what they're referring to under design acc. as 'gal'? I saw the design acc. once and it was listed as m/s2 like it should be.
by Jim Carver 4/18/2011 5:44:02 PM

gal is 1 cm per sec-squared. So 980 gal = 1 G acceleration.
by markfm 4/18/2011 5:48:01 PM

@Nancy : have you ever taken a look to the blueprint plus my drawing down here ? it is a square and lots of circles that exactly fit the square. and there is a lower part of the building.
by Edano 4/18/2011 5:48:48 PM

@Nancy: OK, then we agree ! ;)
I was explicitly talking about the basement; this because G.E. design gives main reactor components location from the basement square area: reactor, drywell and torus are centered, refering to the basement, which makes them easier to locate...
by Jocelyn Mayer 4/18/2011 5:49:55 PM

@markfm Thanks, Mark just looked that up. Forgot about the Galileo, haven't heard that in years.
by Jim Carver 4/18/2011 5:50:18 PM

@Edano I have every time you post it and it is still off. :-)
by Nancy 4/18/2011 5:50:20 PM

Pink lines are the building outlines green line is the grade (grass/dirt/land) www.houseoffoust.com
by Nancy via Houseoffoust 4/18/2011 5:50:52 PM

@Edano, you keep insisting this isn't the elevation of reactor 1 but you have not said what one you think it is an how you came to that conclusion.
by Nancy 4/18/2011 5:52:03 PM

@Edano I think this wasn't clear and threw me off I took that as "no" not "number" @Nancy : but nancy we have a no 1 blueprint.
by Edano at 12:35 PM
by Nancy 4/18/2011 5:53:57 PM

So yes, it is the elevation of 1. One is narrower (above ground) than the other buildings so the location of the well vs. outside walls and other things is a bit different. Most of the speculation has been on 3 and 4 to try to find things and 1 is slightly diff in design.
by Nancy 4/18/2011 5:55:12 PM

Has anyone seen an explanation of the reactor parameters when they provide both (A) and (B) readings, what the difference is? I'm trying to understand, for instance how #2 has the really low (A) suppression well radiation reading, with (B) much higher, same for water level in the reactor -- -1500mm vs. -2100mm.
by markfm edited by Markfm 4/18/2011 5:55:48 PM

Curious due to the wide disparity in the numbers. 0.58 vs 101 Sv/hr, and -1500 vs -2100 mm both seem pretty large deltas.
by Markfm 4/18/2011 5:59:55 PM

I'm referring to the last page of www.meti.go.jp , the table summarizing values by reactor.
by markfm 4/18/2011 6:00:42 PM

That's about what I remembered, design acceleration was 0.32 m/s2 . GEJE (Great East Japan Earthquake) was a few times larger. I'll need that figure, so still have to find that.
by Jim Carver 4/18/2011 6:00:51 PM

TEPCO published readings a couple weeks back, showing the measured accelerations vs. the design accelerations. The different reactors experienced different accelerations, and also turned out to have different design points.
by markfm 4/18/2011 6:02:04 PM

Here you go: www.tepco.co.jp
by markfm 4/18/2011 6:03:28 PM

Does anyone have a copy of (or link to) a copy of Recriticality in a BWR Following a Core Damage Event, USNRC Report, NUREG/CR-5653 (PNL-7476), December 1990 ? Thanks
by Deirdre 4/18/2011 6:13:37 PM

by xxx via Img535.imageshack.us 4/18/2011 6:14:45 PM

google shows www.iaea.org
by RonD 4/18/2011 6:17:51 PM

for PNL-7476, google shows www.iaea.org
by RonD 4/18/2011 6:18:34 PM

@RonD - that links to a different document which references the Recriticality document 7476
by Deirdre 4/18/2011 6:21:26 PM

@Deirdre oops. www.iaea.org
by RonD 4/18/2011 6:23:58 PM

@Deirdre it also looks like the google easy to find info is just references to PNL-7476
by RonD 4/18/2011 6:33:59 PM

Here's the Abstract, but the actual document is a bit elusive for now. Thanks-
"Based on a conservative bounding analysis, this report concludes that there is a potential for recriticality in BWRs if core reflood occurs after control blade melting has begun but prior to significant fuel rod melting. However, a recriticality event will most likely not generate a pressure pulse significant enough to fail the vessel. Instead, a quasi-steady power level would result and the containment pressure and temperature would increase until the containment failure pressure is reached, unless actions are taken to terminate the event…"
by Deirdre 4/18/2011 6:40:10 PM

fleep.com fleep.com
by Edano via Fleep 4/18/2011 6:41:23 PM

@Jim Carver 7.00PM - Wikipedia has useful article on quake shaking strengths etc en.wikipedia.org
by hudebnik 4/18/2011 6:44:25 PM

@Edano: Since 2000, the year with the highest count of 6+ earth quakes was 2007 with 178 quakes.
As of 2011.04.18 there were so far 109 6+ quakes which would interpolate to 368 6+ quakes for 2011.
earthquake.usgs.gov
by ifz 4/18/2011 6:45:07 PM

i couldn't find any statistics before 2000 :/
by ifz 4/18/2011 6:46:13 PM

Not sure if this is of use to anyone. BWR schematic that seems to have info on the systems (wiring,, piping, valves etc) www.nisa.meti.go.jp
by Nancy 4/18/2011 6:59:39 PM

Some info about Toshiba's involvement in building the plants. translate.googleusercontent.com
by Nancy 4/18/2011 7:07:30 PM

Seawater radiation checks off N-plant to be widened www.yomiuri.co.jp
by Markfm 4/18/2011 7:15:17 PM

@Deirdre The document you are looking for is a condition report (/CR) and they aren't available on the NRC site. They are usually incorporated into another document. It may be in this document: pbadupws.nrc.gov
by marie rich 4/18/2011 7:28:11 PM

@Deirdre @All the address for search function of NRC doc.s is : www.nrc.gov
by marie rich 4/18/2011 7:30:36 PM

Robot monitors Fukushima plant A remotely operated robot opens double doors in the building housing the No. 2 reactor at the crippled Fukushima Daiichi Nuclear Power Station in Fukushima Prefecture on April 18, 2011. Tokyo Electric Power Co. began employing the robots the previous day to monitor the temperature, radiation level and oxygen concentration inside the reactor buildings of the plant. (Photo courtesy of Tokyo Electric Power Co.)(Kyodo) english.kyodonews.jp
by NHK Listener via English.kyodonews.jp 4/18/2011 7:36:54 PM

So they did send the robot into #2, but haven't released any data.
by Markfm 4/18/2011 7:38:19 PM

www.iaea.org interesting read.. to compare to what they have done at fukushma
by dean 4/18/2011 7:44:02 PM

@dean can you take a peek at this doc and see if pages 26/27 and 53 and 55 have any relevance to the thermal images? Some shapes are sticking out to me.
www.physor2004.anl.gov
by Canadian 4/18/2011 7:46:23 PM

canadian, I believe what your looking at are the THERMAL "FLUX' levels or intensities.. it.. #NEUTRONS/cm2-sec... thats flux level.. and they use the color coding to reference hi----low fluxes..
by dean 4/18/2011 7:56:02 PM

instead of just a temperature infrared which is measuring temperatures rather than flux levels
by dean 4/18/2011 7:56:27 PM

@dean thanks, so the patterns we see there have no relevance?
by Canadian 4/18/2011 7:56:54 PM

@Markfm This was posted yesterday,, hard to catch it all... At the Fukushima Daiichi nuclear plant, high levels of radiation have kept workers from approaching the buildings housing the first 3 reactors, which lost their cooling functions in the March 11th earthquake and tsunami.On Friday, the highest radiation level measured outside the double-entry doors of the Number 1 to 3 reactor buildings was 2 to 4 millisieverts per hour.Radiation levels measured between the double doors of those reactor buildings was 270 millisieverts in the Number One reactor, 12 in Number 2, and 10 in Number 3.The radiation level detected at the Number One reactor exceeds the national exposure limit of 250 millisieverts for nuclear contract workers.Tokyo Electric Power Company, TEPCO, has started using a remote-controlled robot inside the reactor buildings. www3.nhk.or.jp
by NHK Listener 4/18/2011 7:57:36 PM

no.. I think the patterns are more.. temperature related .... so the wave length or color of the infrared is proportional to the temperature
by dean 4/18/2011 7:57:43 PM