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Atomic number


53

Atomic mass


126.9045 g.mol -1

Electronegativity according to Pauling


2.5

Density


4.93 g.cm-3 at 20°C

Melting point


114 °C

Boiling point


184 °C

Vanderwaals radius


0.177 nm

Ionic radius


0.216 nm (-1) ; 0.05 nm (+7)

Isotopes


15

Electronic shell


[ Kr ] 4d10 5s25p5

Energy of first ionisation


1008.7 kJ.mol -1

Standard potential


+ 0.58 V ( I2/ I- )

Discovered


Bernard Courtois in 1811

Read more: www.lenntech.com

@Nancy Bingo. Hard for anything to to have fallen into a closed environment as TEPCO is trying to claim. They must think everyone out here is either stupid or not paying attention or both.

@Nancy The heat's got to be coming from some place...and it can't be from a source external to SFP #4.

@Nancy Yeah, a tent. That's silly.

I'm still curious about where 1 is headed. Core pressure, while still way below the original design point, is still on its slow, steady, upward run. Core temperature had been steadily decreasing, though nozzle temp bumped +8 on the last measurement.

@Nancy Ha! The tent idea is just a sign of TEPCO lunacy! Besides, unless you completely secure the edges of the "tent" gases will build up inside the "tent" until they begin to leak out from under the edges at the same rate before the "tent" was installed.

@Jim Carver What happens to it when the temp drops below 184?

@Nancy No doubt about it, when we found that shot between the R3 &R4 explosions I torqued my head. I keep looking back at that damage on the R3 side of R4 and it's just harder to figure. Two things. If you combine hydrogen and oxygen in a perfect mix, when you ignite it there are three byproducts, heat, water and vacuum. That explosion could have been two-stage First the H2 O2 flashed, creating enough vacuum to cave in the walls... before the top and whatever that big concrete arc is blew up, then rained right back down in place?

The vacuum cave-in indicates a pretty good H2 mix, but still had enough air mix coming in there was a secondary mix that caught? I'm trying to figure the process.

@Nancy If it helps explain unit 4, here are the original links to tepco releases, and some copy: www.tepco.co.jp
www.tepco.co.jp
www.tepco.co.jp
www.tepco.co.jp
Unit 4At approximately 6:00 am, March 15th, an explosive sound occurred andthe damage in the 5th floor roof of Unit 4 reactor building was confirmed. At 9:38 am, the fire near the north-west part of 4th floor ofUnit 4 reactor building was confirmed. At approximately 11:00 am, TEPCO employee confirmed that the fire was off. At approximately 5:45 am, a TEPCO employee discovered a fire atthe northwest corner of the Nuclear Reactor Building. TEPCO immediatelyreported this incident to the fire department and the local governmentand proceeded with the extinction of fire. At approximately 6:15 am,TEPCO staff confirmed at the site that there are no signs www.tepco.co.jp

Unit 4 (shut down due to regular inspection)-Reactor has been shut down. However, we have confirmed the sustained damage around the 5th floor rooftop area of the Nuclear Reactor Building.-Afterwards, we confirmed the outbreak of fire at the northwestern part of Nuclear Reactor Building. We immediately reported this matter to the fire department and the related authorities.-However, at approximately 11:00am, when TEPCO employee arrived at the seen to confirm, the fire had already died down. At 5:45AM on March 16th, we confirmed the outbreak of the fire again but could not confirm it at 6:15AM. We will continue to monitor the situation carefully.

@dean Similar to a "moment" of inertia, a "moment" of criticality.

Seems like we have this disscussion about once a week for the past four.

@Nancy 15 Mar. 6:00 am explosion. 5th floor damaged. 15Mar. 9:38 am fire on NW 4th flr. out by approx. 11:00 am. 16Mar. fire on 4th flr at 5:45am fire again, out by 6:15am. an explosion and two fires on two separate days. Fires in the NW corner. What's stored/positioned there?

@radioguy Yeah, selective memory.

I think JO L'indien's original idea back mid-March is looking golden about now: the R2 core melt molten sieve is looking pretty good right now. 30,000 cubic meters of highly radioactive water in the R2 sub-basement area? Sounds like it was pouring right through for a while.

@marie rich north corners of 4 = seaside, yellow containment cap and a small area behind it, not sure what was there. Landside corner, steam dryer pool. I have not determined yet what corner the control room with glass viewing windows was in.

the explosion would be the likely ignition for the first fire. Wonder what would start the second...there was no power, as we know too well.

@marie rich It means something. It was where that fire started. Fitter has been wondering about welding tanks possibly having a hand in some of the events at 4. He said there are maintenance things where they need welding torches on the work deck. There are other things on that end. I will be taking an extra look on that end when I go back through all the interior images. I have photos of those corners from a few angles on 3 before the quake. Might give some clues.

Acetylene would blow, i think, not flame. Chemicals could have leaked and interacted. @es they had electric power that could spark that fire, tho

@es @marie rich thanks, transformers could have contributed. If it was post explosion there was likely debris in places there wasn't anything previously. Lots of potential interactions. We should make sure fitter gets that news story when he shows back up.

@marie rich @Nancy don't know if this is helpful or you already have but found these pics of 1-4 .There is a plan layout in them may tell you what's in corner of R3 not sure if 4layout is same? translate.google.com