Off the Scale: Reactor No. 2 temperature exceeded 400°C — Tepco says device broken — Reporter asks about recriticality

Published: February 13th, 2012 at 10:13 am ET


Title: “Failure to ensure” thermometer Unit 2 reactor … abnormal circuit
Source: Yomiuri
Date: Feb 13, 2012
Google Translation

Tokyo Electric Power Company on August 13, after inspection of the afternoon, and the upper limit of 400 degrees Furikireru beyond the recording thermometer on the bottom of the reactor pressure vessel of Unit 2 of Fukushima Daiichi Nuclear Power Station showed a rise in temperature, abnormal announced that it had shown a number.

TEPCO sees as “almost certainly have failed.” Thermometer, after being exposed to high temperatures in the molten core, had been placed in high humidity environments. […]

Read the report here


[…] Jiji Tsushin says right before 3PM, the temperature was 342.2 degrees Celsius.

[… Tepco Press Conference…]

Q: The temperature rise in early February – was it related to the instrument failure now?
A: We think so. But we didn’t know at that time whether it was actually a rise in temperature or the instrument failure. The temperature did go down after increasing the water injection.

Q: How reliable is it to judge “recriticality” by xenon-135?
A: We think it is a reliable indicator.

Q: When was 342.2 degrees Celsius recorded?
A: We finished the testing at 2:54PM. So it must be between that time and 3PM. We’ll have to check.

Q: How high did the temperature go? (looking at the graph that was provided)
A: It went overscale, so the graph shows temperatures like that [over 400 degrees Celsius].

Published: February 13th, 2012 at 10:13 am ET


Related Posts

  1. Reporter asks if Tepco test caused device to break — Nuclear experts doubt foregone conclusion of instrument failure at Reactor No. 2 February 13, 2012
  2. Asahi Reporter: Tepco graph shows spike above 90°C at Reactor No. 2 — Exactly how high have temperatures gone? February 12, 2012
  3. Tepco: 91.2°C at Reactor No. 2 — Reporter suspicious of instrument failure claim since it’s steadily rising in small increments February 12, 2012
  4. Asahi: Reactor No. 2 temperature stays high despite Tepco’s stabilization effort — Was back up to 72°C February 8, 2012
  5. NHK: Unknown temperature rise at Reactor No. 2 troubling Tepco — Says it hasn’t gone down even after increasing volume of cooling water on Tuesday (VIDEO) February 7, 2012

27 comments to Off the Scale: Reactor No. 2 temperature exceeded 400°C — Tepco says device broken — Reporter asks about recriticality

  • BeniJax

    Could it be they have found cold fission?

  • Sickputer

    Well, we know the corium (inside core) can hit 10 times that temp. Something very troubling is happening inside Reactor 2.

  • retali8 retali8

    this has been predicted by many on enenews already, we have known months ago the fuel left the building,, now its sitting in pockets unable to be cooled, tepco is franticly fearing the worst, so they should, i just wish the world knew of japan/tepco's lies and cover up, and hold them accountable,, when this baby blows we will all have to suffer.. ;\

    • Anthony Anthony

      I guess the big thinkers believe after 311 that a catastrophic explosive far reaching disaster DOES NOT require or mandate movement of people away from the source. 311 is the benchmark of nuclear disaster reaction as shown by minimal response outside of reporting nuclear mishaps like nothing happened to worry about.

      As we ride out this unfolding nuclear disaster, even with the rising temps and instability in general of the situation, I believe the common thinking is to stay in place, ride it out, the worst has already happened back in March.

      We are more inclined in general to react to the situation but Joe Public has weathered this nuclear storm, mostly oblivious to the dangers we feel need be addressed. Joe Public outnumbers us thousands and thousands to one; when and if another major Fuku event occurs people will be watching it like some TV program – somewhere else that doesn't affect me.

  • Sickputer

    My brother just asked me by phone when reactor 2 might blow…I said 5 days, 5 months, maybe never. But Reactor 2 doesn't have to blow to ruin the earth.

    the bad thing is the constant flow of bleed and feed (tons of Tepeco-injected coolant water per hour to keep it from exploding) and that contaminated water is not being stored…it flows from earthquake fissures into the ocean.

    Ten years of that and the oceans of the world may be devoid of life. 2 billion people who live off the sea life will be starving.

    • Mack Mack

      Hey SP – I'm concerned about something called "soil liquefaction." Don't know if it has been discussed before, but wiki defines it like this:

      "Soil liquefaction describes a phenomenon whereby a saturated soil substantially loses strength and stiffness in response to an applied stress, usually earthquake shaking or other sudden change in stress condition, causing it to behave like a liquid."

      With all of the water being pumped into the reactor buildings and the immense heat from the radiated blobs, I believe soil liquefaction could take place. The ground could turn into a quicksand-like soil, and then the reactors would begin to sink/topple.

      Okay, I just found this video on liquefaction, so someone much quicker/smarter than me was already thinking about it:

  • moonshellblue moonshellblue

    Just wondering why you think it will blow? I don't think there will be an explosion as I think the corium is slowly shifting it's present location by the added water, earthquakes and human intervention which is causing the temp to increase of course it could be a faultily thermo but I doubt this also due to TEPCO's actions. It's anyones guess.

  • aigeezer aigeezer

    I know Google translations can be goofy, but this one made me laugh.

    "TEPCO sees … failed… thermometer, after being exposed to high temperatures in the molten core…."

    Sometimes they tell the truth despite themselves?

  • farawayfan farawayfan

    Temp gauge they broke. Steady smooth rise in temps, then they do a "diagnostic" and lo and behold right after it skyrockets to 400+. Dirtbags fried the gauge deliberately before it could hit a temp where their ludicrous cold shutdown would be revealed. Bravo, TEPSCUM.

  • Cindy

    When gagues fails, they usually just stay 'stuck' on a number… Why would it go up ??

    Wierd …

  • aigeezer aigeezer

    "The temperature did go down after increasing the water injection."

    They trust the gauge when it tells them what they want to be told.

  • bleep_hits_blades

    This question probably shows my sketchy grasp of this situation – but is there just this one temperature measuring device?

    Usually if you think you have a faulty part, you replace the part and see if the replacement shows the same or different readings.

    Re the corium, probably most people here know this – but I read (somewhere) last night that, you drop a blob of corium into water and you WILL get an explosion.

    Another question, isn't the melting/high temps. in the coriums of the demolished reactors just inevitable?

  • MaidenHeaven MaidenHeaven

    RE: Mack's post about

    Because the soil would be liquified to some degree will this more likely cause China Syndrome? My thought is that risks are increased for the fuel to come into contact with water.

    Are there more or less risks because the soil will now contain so much salt from the leaked Salt water being poured into the reactors?

  • PattieB PattieB

    The core of #1 is currently SITTING in the water table, and… The core of #3 blew right past it, EXPLOSIVELY! and is resting 250 meters under the plant in sandstone.

    #2 was moving lower months back… slowly, as it got more cooling while still in the building. It had a rupture torus before it melted down/out… so the rupture core water had some place to flow out of the containment… I.E. it was getting fresh water on it almost continusly onece it got out of the steel core, it then took its time to eat the concrete floor. They took sample of the corium as it left the building with an earth-core drill. Now.. it may have become hung-up on a harder bit of stuff in ground? It won't matter in the end-game. That temp sensor just sits over the corium hole in the plant floor… the others have ever more water being pumped over them. There will be steam issues… but for hydrovolcaic events to happen?… You MUST have PRESSURE build up! It can't! The ground around the plants is riddled with fissures! The have them coverd by big heavy construction-site plates… so they can drive the cranes around, is all. It's all hype to preserve the cold shutdown ruse!

    It's play the game, or evacuate Tokyo… care to guess what they decided?

  • PattieB PattieB

    As for slide-into sea? Can't. Remember… there is a subduction zone right off the coast. When the quake hit.. it released a bunch of pressure, and the land the plants sit on… dropped an average of 14 inches. But that doesn't mean the pressure trying to lift that area up into a mountain is in any way gone! The coriums in the ground in fact… add even MORE up-lit pressue to the plant site now. #3's core has formed a natural-earth housed style of reactor underground. This will increase the fissures, and possibly result in building foundations sinking-in ever more like we have already seen happening.

  • jec jec

    Radiation levels of the reactors is never talked about. TEPOC is measuring gases –they know the radiation is being emitted. How come no mention..or even question from the press? THAT is the question to ask..what is the radation amount being vented or steams out of the "tents"–pick an hour..any hour..and ask for it. If in Cold Shutdown..their should be no additional or increase in radiation to speak of..

  • Sevv Sevv

    PattieB, since you seem to be highly knowledgable with this subject, I'd like to ask, what will happen in the long term (if that is possible at all)?
    In the end, will the coriums just sink through the sandy underground? As far as I know, it is said that below the sandy stuff there's bedrock, which is a good neutron reflector. This would prompt a nuclear explosion, wouldnt it? So while the probability of a hydrogen explosion is now minimal (thanks to the fissures), the nuclear explosion is now more likely than ever (eventually)?
    I appreciate your answers in advance!

    • PattieB PattieB

      Nope.. not with the stuff underground/

      the ONLY fissionable that can go up in a bomb-type way without mans help… semi-pure Plutonium-239 in enough quantity. Urainium 235 is what get used in bombs… not 238. The rods only have small amount of 235 and even the MOX rods only have 6% PU-239. #3 & #4 have the Pure PU-239 with 30% PU-240 mixed in… that tends to make it fizzle. The pure stuff already fissioned explosively sending it down past the water table. The stuff in the pool of #3 was 10 years old… again, fission.. but fizzled. The pool of #4 has 40 rods that are new PU-239… making the light we all see in JNN cam when boric acid levels in tank goes down… I worry about them! That pool also has MOX and loads of old U-238's. It's open-top reactor with unknown amount of fuel in it… just had fire again (8th time?) it's spewing out radioactive elements that are like a plume of death.

      The coriums… it takes a good bit of hardwear to make a bomb… or, perfectly balanced explosive implosion to get even the small portion of U-235 in them to go critical. It's not going to happen.
      Butt… we may yet have a few steam explosions yet… due to separation of water into hydrogen and oxygen when heated. I have seen no status of pools in #1 & #2 buildings… just words from folks who lie for a living it seems.

      The shared pool had casks in lower level with rods in them that burned out… nothing being said there? The entire exotic Gas building is now gone.. and it had undergound connection to #2,3,4,reactor buildings that I know of. Again more rad-emiter-sources. #5 & 6 they are being very tight-liped and secretive about their problems.

      So.. Nuke bomb level.. #4's pool IS still in that game! #5 & 6… posibility, but I currently have no info to even form status-possibility.

  • PattieB PattieB

    Long term… frankly… yah gots me! I don't know of anything we have to safely retrive what's gone goffer. It's past the point of even doing what Ukrainians did now. Can't bury it… that would give pressure and end with a hydrovolcanic 'EVENT' can't leave it open… it's spewing out radiation like mad!

    Best guess now?

    Make a well over them, fill with water after doing that water barrier drill-insert type work around the site… isolating them in place. Then put circulation / cooling system in them once you clear the buildings out the way.
    It's not a GOOD fix?… but may be best can be had at this point.

    That massive tent they put over #1 is the biggest joke EVER! It's implimentation was just for 'PR VALUE! ONLY!' It wasted lots of $$$ and lots of time they could ill afford! NOW the rods in #4 that are the worst hazard, may be non-recoverable in any way… the standard way is out, as the tops and means to lift them have melted away! DUMB! ASS! POLITICS! They did it so could con people and get them to stay!

  • PattieB PattieB

    Japan gov’t to finally admit indefinite forced depopulation of large zones around Fukushima plant.

    That says it all… doesn't it? Not forced evacuations! Forced depopulations!

  • PattieB PattieB

    One of the main things I'm begining to see… confusing 'Criticality' with something blowing up! Criticality is NOT an explosive thing, unless it's happening with Urainum 235, or Plutonium 239! Those to will chain-up in a fast enough way to give you a 'blast' and U-235 can't even do so without help! Reactor rods are mostly U-238, a different element. Criticality ONLY causes geat levels of heat and radioactive out-pourings!

    SO!… it's the P-239 rods in #4's pool… and possibly what's sitting in reactors #5 & #6 that can possibly constitute a 'BOMB' waiting to go off!

    The others… much like reactor #1 did… could separate the water into hydrogen and oxygen… then with a spark, blow-out. The coriums in the ground… add methane to this mixture.

    #3's pool… had 10+ years old Plutonium-239 rods in it, and is why it's destruction was mini-nuke-like. But, its rods had much Plutonium-240 in with it… that element makes a blast fizzle-out mostly.

    Consider the factors folks… #2 is not even high on the dangers board at this point in time. Slow the water influx back down… mind the #1 & #2 pools… and get back to the real problems.

  • PattieB PattieB

    These folks have the tech to get the ball rolling on a long-term fix.