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Japan: Fukushima No. 2 reactor temperature up to 82C, but not critical: TEPCO
Mainichi Shimbun ^ | 02/12/12

Posted on 02/12/2012 5:46:42 AM PST by TigerLikesRooster

Fukushima No. 2 reactor temperature up to 82C, but not critical: TEPCO

TOKYO (Kyodo) -- Tokyo Electric Power Co. said Sunday the temperature at the bottom of the No. 2 reactor at its crippled Fukushima No. 1 nuclear plant rose further to 82 C, but the reactor has not gone critical.

While the thermometer reading at shortly after 2 p.m. marked a new high since the reactor attained a cold shutdown in December, the utility known as TEPCO said it has confirmed that sustained nuclear reactions are not taking place in the reactor as no radioactive xenon has been detected inside its containment vessel.

TEPCO reported the latest development immediately to the Nuclear and Industrial Safety Agency of the Economy, Trade and Industry Ministry as the temperature exceeded the limit of 80 C designated by the company's safety regulation for maintaining a cold shutdown, it said.

It is considered desirable to keep the temperature below 80 C, while the bottom of a reactor pressure vessel must be kept below 100 C in a stable cold shutdown, in view of the margin of error of thermometers, according to TEPCO officials.

(Excerpt) Read more at mdn.mainichi.jp ...


TOPICS: Foreign Affairs; Japan; News/Current Events
KEYWORDS: fukushima; radiation; reactor2

1 posted on 02/12/2012 5:46:52 AM PST by TigerLikesRooster
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To: TigerLikesRooster; sushiman; Ronin; AmericanInTokyo; gaijin; struggle; DTogo; GATOR NAVY; Iris7; ...

P!


2 posted on 02/12/2012 5:48:49 AM PST by TigerLikesRooster (The way to crush the bourgeois is to grind them between the millstones of taxation and inflation)
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To: TigerLikesRooster
Well, as long as there's no xenon we are safe ~ safe! Arrrrrrggggggh ~ S A F E!!!

No XENON.

So, I have to ask this time why the guys in charge of this need to tell me this is not a "critical temperature". ~

NO XENON!!!!

This is an undifferentiated pile of radioactive waste materials dumped out of crushed or opened fuel rods ~ so what's in there?

3 posted on 02/12/2012 5:56:39 AM PST by muawiyah
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To: TigerLikesRooster
It seems as if they cannot control the temperature of this pile of rubble. Is there a chance that it will reach criticality? What happens then?
4 posted on 02/12/2012 6:05:32 AM PST by Former Proud Canadian (Obamanomics-We don't need your stinking tar sands oil, or the jobs that go with it.)
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To: Former Proud Canadian

” What happens then?”
Shrimp become 2 feet long and fish have two heads.


5 posted on 02/12/2012 6:09:37 AM PST by duckman (Go Newt...)
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To: duckman

Gojira !


6 posted on 02/12/2012 6:15:21 AM PST by Eric in the Ozarks (Beware the Sweater Vest)
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To: Eric in the Ozarks

Mothra!


7 posted on 02/12/2012 6:19:53 AM PST by muawiyah
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To: Former Proud Canadian

There is zero chance of any of the reactors going critical. The reaction stopped instantly when the reactors were scrambled and the boron rods dropped. ( well not instantly but close enough )


8 posted on 02/12/2012 6:24:37 AM PST by central_va ( I won't be reconstructed and I do not give a damn.)
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To: duckman

Looking forward to the 40 foot long squid. Calamari for a 1000?


9 posted on 02/12/2012 6:25:45 AM PST by central_va ( I won't be reconstructed and I do not give a damn.)
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To: central_va

The sushi that ate Sendai !


10 posted on 02/12/2012 6:32:10 AM PST by Eric in the Ozarks (Beware the Sweater Vest)
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To: TigerLikesRooster
in view of the margin of error of thermometers, according to TEPCO officials.

These guys need a very wide margin of error.

11 posted on 02/12/2012 6:45:13 AM PST by bgill (Romney & Obama are both ineligible. A non-NBC GOP prez shuts down all ?s on Obama's admin)
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To: central_va

Yes, and it comes with a pretty green glow that you can enjoy for days.


12 posted on 02/12/2012 6:47:52 AM PST by autumnraine (America how long will you be so deaf and dumb to the tumbril wheels carrying you to the guillotine?)
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To: central_va

Ok, so what does it matter that the temperature is increasing?


13 posted on 02/12/2012 7:25:55 AM PST by Former Proud Canadian (Obamanomics-We don't need your stinking tar sands oil, or the jobs that go with it.)
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To: Former Proud Canadian
Ok, if you want to fret over something the issue is not the core going critical, it can't. What may still be a concern is melt down. The core actually becoming molten, and potentially melting thru the concrete containment. A highly unlikely event.

Again there is zero threat of going critical.

14 posted on 02/12/2012 7:41:09 AM PST by central_va ( I won't be reconstructed and I do not give a damn.)
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To: Former Proud Canadian
Ok, so what does it matter that the temperature is increasing?

It means that the cold shutdown lie is dead. Tepco/Japan just does not want to give up on that dead horse yet. They are claiming sensor failure and that temperature is not the main metric to determine Cold Shutdown Conditions. These Japanese Nuclear engineers are starting to sound like Global Warming proponents. Warmth causes snow - Temperature has nothing to do with Cold Shutdown.

The main problem with the high temperature readings is that it means they have no clue as to what they are doing. But hey, some of us already knew that. We are in uncharted territory. We need to know what is causing the high temperature. It could be heat coming out of the hole where the corium melted reactor mess is digging into. Or it could be heat from some of the remaining as yet unmelted core that still resides in the RPV with a big hole in the bottom of it. And recriticalities have been ongoing. They have measured radioactive iodine around Japan off and on ever since last March. You see, once the core melts, there is no containment and no shutdown. The control rods have also melted.

15 posted on 02/12/2012 12:21:20 PM PST by justa-hairyape
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To: justa-hairyape
All of this means they don't know why it's heating up ~ even though there is much speculation in that regard.
16 posted on 02/12/2012 2:06:44 PM PST by muawiyah
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To: muawiyah
Temperature eventually rose to 91-94 C, then Tepco did a resistance test on the Thermocouple sensor, and then it went bat crazy. Starting reading 260-280 C. Looks like something is causing temperature sensors to fail within Reactor #2. They had a similar problem in January. A temperature sensor in the lower section of the RPV rose to about 140 C, then started reading negative temps.

So temperature sensors within reactor #2 are failing after reading high temps. Tepco is losing the ability to determine what is happening within the RPV of reactor #2.

17 posted on 02/13/2012 3:40:30 AM PST by justa-hairyape
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To: justa-hairyape

At the same time they are telling us it’s not returning to criticality ~ or something like that ~ RETURNING? It’s been there? ~ without sensors they are blind.


18 posted on 02/13/2012 5:39:24 AM PST by muawiyah
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To: muawiyah

Seems like they are experiencing a new problem each week.


19 posted on 02/13/2012 10:16:46 AM PST by freebird5850 (Of course Obama loves his country...it's just that Newt loves mine!)
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To: justa-hairyape
A faulty instrument is the most likely cause. I knew it.

Truth of the matter is here.

20 posted on 02/13/2012 6:47:47 PM PST by chimera
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To: TigerLikesRooster
This is from today's newsfeed at Atomic Power Review:

"Fukushima Daiichi No. 2 temperature update

This writer's assumption of February 7 seems now confirmed by TEPCO, who are now saying that the high-reading instrument near the bottom of the reactor vessel at their 1F-2 plant is likely failed. The detector has failed a resistance check performed by TEPCO, meaning that the indication is confirmed incorrect.

It is thus safe to disregard this one outlier in terms of temperature readings at 1F-2 and continue to consider the state as announced previously by TEPCO and the Japanese government as essentially 'cold shutdown.'"

Basically confirmation that the instrument has failed and is giving false readings. I called it as well. So much for the "uncontrolled criticality" fearmongers, who have been wrong all along.

21 posted on 02/14/2012 11:19:21 PM PST by chimera
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To: chimera
Not really wrong, but quite untrusting of the officials in charge of this one. Their final judgment on whether or not it was a failed thermocouple or something else was based on the fact the plant hadn't gone critical yet!

They're doing it by the seat of the pants ~ not with hard, cold logic and reason based on a full understanding of the processes they're herding like cats.

One report a year ago (based on TEPCO data) said there may well be 600,000 spent fuel rods AT THIS SITE underneath the reactors.

I guess that was a smart thing to do ~ so that when they get a meltdown....... well, maybe that doesn't go critical either!

I'm adding you to a thread where the topic is EARTHQUAKES and how we might well be able to build earthquake proof facilities ~ by making them INVISIBLE to wave forms generated by earthquakes. Thought you might like to see what the mathematicians and geologists are coming up with.

22 posted on 02/16/2012 5:44:33 PM PST by muawiyah
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To: muawiyah
Do you know what “critical” means, from a reactor physics viewpoint, in a chain-reacting system? From the moment these reactors shut down, which happened immediately upon sensing of the seismic event, there has been absolutely no credible evidence to indicate that they have been anything other than subcritical (i.e., shut down from the aspect of neutron multiplication). The neutron monitors have shown no evidence of criticality, and many of these are extremely sensitive, down into the range of 1E-9 % of full power.
23 posted on 02/16/2012 6:30:53 PM PST by chimera
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To: chimera
You need to tell that to the guys running the show who keep telling us about it no longer being critical, not yet critical, has not returned to critical, etc.

I don't think there can be so many instances of this type of language and it merely be my fault for not understanding ~ these things are NEVER supposed to go critical under these conditions, nor be capable of returning to criticality!

Mine is a world of correct grammar and perfect spelling. Words have meanings. Nuance has implications.

And what about the 600,000 spent nuclear fuel rods?

24 posted on 02/16/2012 8:17:29 PM PST by muawiyah
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To: muawiyah
Criticality accidents are extremely rare, but a few have happened, so it is not unheard of in this business. But such has not been the case here. There has been no credible evidence of uncontrolled criticality in either the damaged core or the fuel storage pools.

As far as the "600,000 spent fuel rods", I'm not afraid of them. Why? Because I understand the science, I am a grown up and scare stories for the kiddies don't frighten me anymore. I've been around similar used fuel storage pools and nothing bad happened, nor will it happen. The hysterical fear-mongering "reports" right after this event were falsehoods such as "the fuel pool went critical". It did not. Another rumor said that the pool had "caught fire". It didn't. Another said the fuel pool "went dry". It didn't. Another said it had collapsed to the building floor. It didn't. There has been fear monger after fear monger put forth lies and scare mongering rumors, none of which has proved true! The number of liars among the fear mongers vastly outnumbers any "lies" from TEPCO or the Japanese government!! And those have caused more harm than any radiation release has!!!!!!

(See, others can use exclamation points too!!!!!!!!!!!!!!)

25 posted on 02/17/2012 9:27:25 AM PST by chimera
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