Japan Earthquake

Japan Earthquake | Page 738

by Tenzing via I53.tinypic 4/17/2011 10:07:59 AM

by Tenzing via I52.tinypic 4/17/2011 10:11:11 AM

by Tenzing via I54.tinypic 4/17/2011 10:12:17 AM

by Tenzing via I53.tinypic 4/17/2011 10:13:12 AM

by Tenzing via I51.tinypic 4/17/2011 10:14:02 AM

seem to be first signs of the RPV in R1 stabilising at last. Both pressure and temp went down over the last 24h and both measured temps are below boiling point assuming the higher pressure reading... www.meti.go.jp www.meti.go.jp But let's see if it continues I guess.
by Sims 4/17/2011 10:30:51 AM

Just analysed the METI released data, good and bad things there...
by Jo Lindien 4/17/2011 10:37:40 AM

english.kyodonews.jp spf #4 lots of water in it .....
by Edano via English.kyodonews.jp 4/17/2011 10:40:10 AM

#1: as Sims mentioned, for the first time the RPV temperature crossed the boiling point which means steam is starting to condense and may explain the fact the pressure is now dropping.
The bad thing is that water is boiling in the drywell which means there's a heat source there; this is an evidence (given the fact we don't have radiation data there anymore) there's criticality in the drywell, not just highly radioactive material escape from the RPV.
by Jo Lindien 4/17/2011 10:40:53 AM

@Edano: lot's of water in #4 SFP, but obviously boiling, which is not good...
by Jo Lindien 4/17/2011 10:41:38 AM

#2: RPV temperature stabilinzing at about 140 °C is not very good.
For the drywell, same as #1: high radioactivity level (26 / 29.5 Sv/h) plus water boiling there means presence of a powerfull heat source; in other words, free running nuclear fission.
Also note the radioactivity level in the suppression chamber is higher than we could think from previous releases: 12.1 Sv/h. It's likely that fuel debris go on leaking to the suppression chamber with the water flow. This is bad: no way to go near the suppression chamber and isolate the part leaking using valves (if it's possible, which we don't know...)
by Jo Lindien 4/17/2011 10:47:25 AM

#3: worse than #1 & #2. RPV is not the threat, in my opinion, there: its temperature is near the boiling point (122 °C), the pressure is low, it's likely to stabilize soon.
Drywell: very bad data: high radioactivity, very high temperature: 253 °C near the RPV, 104 °C. There's likely a huge fuel leak there and my guess is now the 20th of March RPV depressurisation was at the time the fuel breached the RPV.
Suppression chamber: radioactivity is incredibly high there: 56 Sv/h ! Hope this data is false, as it seems not consistent with the temperature which is low; or it may mean that a lot of fuel debris has escaped there but there are too scattered in the torus to be able to restart a fission reaction; we may have more clues with next data releases.
by Jo Lindien 4/17/2011 10:54:35 AM

@elaine: you're welcome, I'm just trying to interpret this release as we have a lot of new data that can help a lot to understand: we now have drywell and suppression chamber temperatures !
This said, my guesses may be wrong: this is what I think given the physics data and remembering thermodynamics law but the truth may be more subtle... Note that I'm not a nuclear physics specialist...
by Jo Lindien 4/17/2011 10:57:29 AM

Press conference: www.ustream.tv
by Kat 4/17/2011 11:00:55 AM

#5 and #6: not a lot of data. Temperature are stabilized, #6 being less stable than #5. This goes: fill in, wait for water to drop, refill, ... The way the pressures dropped suddenly the 20th of March is a clue that something may have broke in the primary coolant loop this day.
by Jo Lindien 4/17/2011 11:04:47 AM

i haven't seen updated graphs on this for a while.
by Edano 4/17/2011 11:06:54 AM

@ Jo Lindien - thanks so much for the update. Really helpful for me as a technical ignoraumus
by UKVal 4/17/2011 11:08:17 AM

@Edano: I'm tracking data for all Fukushima reactors:
#5 reactor: lh6.googleusercontent.com
#6 reactor: lh6.googleusercontent.com
Purple is pressure (MPa, scale on the left), blue is water level (meter, scale on the left), red is temperature (°C, scale on the right)
by Jo Lindien via Lh6.googleusercontent 4/17/2011 11:15:35 AM

@Edano: I'm tracking data for all Fukushima reactors:
#5 reactor: lh6.googleusercontent.com
#6 reactor: lh6.googleusercontent.com
Purple is pressure (MPa, scale on the left), blue is water level (meter, scale on the left), red is temperature (°C, scale on the right)
by Jo Lindien via Lh6.googleusercontent 4/17/2011 11:15:35 AM

@Jo Lindien : thank you. but the fukushimadatapage.com is not updated and i liked the plot from this brazil university. don't have a link tho.
by Edano 4/17/2011 11:22:19 AM

did not take time to add legends to make it easier to read... Will do...
by Jo Lindien 4/17/2011 11:23:42 AM

look on this, this is great, they restore almost all sensors (page 5): www.meti.go.jp
by xxx 4/17/2011 11:43:02 AM

www.ic.unicamp.br
by Markfm 4/17/2011 11:43:29 AM

s/c 121 Sv, nice...
by xxx 4/17/2011 11:45:10 AM

and this: www.meti.go.jp
by xxx 4/17/2011 11:46:26 AM

@Markfm : thank you very much i looked for that ! www.ic.unicamp.br www.ic.unicamp.br www.ic.unicamp.br
by Edano via Ic.unicamp.br 4/17/2011 11:46:36 AM

@Markfm : thank you very much i looked for that ! www.ic.unicamp.br www.ic.unicamp.br www.ic.unicamp.br
by Edano via Ic.unicamp.br 4/17/2011 11:46:36 AM

@Markfm : thank you very much i looked for that ! www.ic.unicamp.br www.ic.unicamp.br www.ic.unicamp.br
by Edano via Ic.unicamp.br 4/17/2011 11:46:36 AM

@xxx:my bad, you're right: #2 suppression chamber is 121 Sv/h, not 12.1. This plus the drywell temperature (131 against 104 at HVH), unlike what I previously said, #2 state is worse than #3.
by Jo Lindien 4/17/2011 11:57:06 AM

@Jo Lindien and #3 rpv 253C...
by xxx 4/17/2011 12:03:43 PM

@xxx: I suppose drywell RPV & HVH temperature are correlated; then, #3 is 253 °C at RPV measure point while being 104 °C at HVH, #2 being 131 °C at HVH is likely to be near 300 °C at RPV or higher...
Of course the correlation hypothesis might be false.
by Jo Lindien 4/17/2011 12:07:02 PM

english.kyodonews.jp Japan spokesman Edano in Fukushima
Chief Cabinet Secretary Yukio Edano (front) wears a protective suit on the premises of a police station in Minamisoma, Fukushima Prefecture, on April 17, 2011. Edano, Japan's top government spokesman, then headed to an evacuation area within 20 kilometers from the crippled Fukushima Nuclear Power Station. (Kyodo) Google earth says 15.6miles or 25.2Km
by NHK Listener via English.kyodonews.jp 4/17/2011 12:29:19 PM

@Bobby1 Are you looking at the station readings? The ones with wavelengths? What do the percentages mean?
by Nancy 4/17/2011 1:06:58 PM

Gist of TEPCO plan to end Fukushima nuke crisis

TOKYO, April 17, Kyodo

The following is the gist of steps Tokyo Electric Power Co. announced Sunday that it will take to bring under control the crippled Fukushima Daiichi nuclear power plant hit by the March 11 earthquake and tsunami.

TEPCO aims to achieve:

STEP 1 (In roughly three months)

-- Filling containment vessels of Nos. 1, 3 reactors with water.

-- Sealing with sticky cement part in No. 2 reactor's containment vessel believed breached.

-- Injecting nitrogen into Nos. 2, 3 reactors to avoid possible hydrogen explosion.

-- Restoring circulatory cooling system for spent fuel pools.

-- Installing facility to decontaminate highly tainted water and purify seawater.

STEP 2 (In roughly six to nine months)

-- Bringing reactors into stable condition known as 'cold shutdown.'

-- Blanketing buildings housing Nos. 1, 3, 4 reactors with covering.

MIDTERM GOALS

-- Extracting fuel assemblies from pools holding spent fuel.

-- Covering reactor buildings with containers, such as those using concrete.

==Kyodo english.kyodonews.jp
by NHK Listener 4/17/2011 1:09:42 PM

Removal of rubble (Amount equivalent to 8 containers) using remote-control heaving machineries was carried out. (From 9:00 till 16:00 April 16th) www.nisa.meti.go.jp
by NHK Listener 4/17/2011 1:22:02 PM

#2 not mentioned for the covering mid-term?
by Markfm 4/17/2011 1:26:57 PM

@Markfm 2 still has a roof
by NHK Listener 4/17/2011 1:28:08 PM

@Edano This is not an attack on you, but I have some real concerns with the validity of that alleged picture of the #4 SPF. When I compare that picture to other current pictures of the heavily damaged #4 Reactor building, I have a hard time finding such an undamaged section of the SPF.
by James Ward 4/17/2011 1:41:24 PM

@James Ward have you watched the videos?
by NHK Listener 4/17/2011 1:42:29 PM

@James Ward you can download them here www.tepco.co.jp
by NHK Listener 4/17/2011 1:44:18 PM

I looked at those new tepco videos last night. They have some much better images than the stills released. In the process of grabbing stills today. I think we can get a better idea of what is going on. James, what about the SFP is concerning? Are you talking from the water gathering shots?
by Nancy 4/17/2011 1:48:54 PM

english.kyodonews.jp Robot checks Fukushima plant
A remotely operated robot opens double doors in the building housing the No. 3 reactor at the crippled Fukushima Daiichi Nuclear Power Station in Fukushima Prefecture on April 17, 2011. Tokyo Electric Power Co. began employing the robots to examine the temperature, radiation level and oxygen concentration inside the reactor building. (Photo courtesy of Tokyo Electric Power Co.)(Kyodo)
by NHK Listener via English.kyodonews.jp 4/17/2011 1:49:44 PM

english.kyodonews.jp Fukushima Daiichi nuclear plant
Handout photo taken on April 12, 2011, shows a container being pulled up after extracting a water sample from the spent nuclear fuel pool of the No. 4 reactor at the Fukushima Daiichi nuclear plant, which has been crippled since the March 11 earthquake and tsunami. (Photo courtesy of Tokyo Electric Power Co.)(Kyodo)
by NHK Listener via English.kyodonews.jp 4/17/2011 1:51:18 PM

@NHK Listener Yes, I've looked at all of the videos and pictures...that's the reason for my concern with the water sampling picture. There is no discernible damage...and there should be.
by James Ward 4/17/2011 1:51:33 PM