Friday, December 2, 2011

#Fukushima I Nuke Plant: TEPCO Denies Damage by Earthquake in Interim Accident Report, Insists No Explosion in Reactor 2

without giving even a speculation as to why then Reactor 2 released the largest amount of radioactive materials into the atmosphere.

On December 2, TEPCO issued the interim report on the Fukushima I Nuke Plant accident which was compiled by the company and supposedly vetted by the experts outside the company.

As the hurricane-force wind knocked out power lines and telephone lines in my neighborhood, my DSL line's dead, and I cannot see the large files like PDF files that TEPCO dumped on their website.

So my knowledge of the content right now is limited to what people who (had to) read these files have said so far. Links are in Japanese.

Here's one from Mainichi Shinbun (12/2/2011):


TEPCO disclosed the interim report on the internal investigation (headed by Vice President Masao Yamasaki) of the Fukushima I Nuclear Power Plant accident. The company again denied the damage of the main facilities at the plant including pipes due to the earthquake, and concluded that the tsunami that exceeded the expectation causing the station blackout was the reason why the cooling of the reactors failed, which caused the accident. Vice President Yamasaki emphasized again that the company "has been one with the national government in carrying out safety measures". The final report is expected by June next year.


TEPCO's internal investigation is separate from the national government's investigation committee. TEPCO started the investigation this June.


The report is in 130 pages in A4 size paper. As to the countermeasures for tsunami, TEPCO simply repeated what it had said before; that the company calculated the maximum tsunami height to be 10.2 meters based on the earthquakes/tsunamis in 1896 and 869, but dismissed its own calculation as "baseless assumption" and did not use it in countermeasures. As to the earthquake, it was "a huge earthquake that exceeded the area specified by the government's earthquake countermeasures headquarters", and "the situation exceeded the expectation, and as the result the company couldn't prevent the accident from getting worse", TEPCO says.


As to the effect of the earthquake, TEPCO concluded that there was no damage to the main facilities such as pipes and cooling mechanisms, based on the reactor data. Emergency diesel generators couldn't be used because of tsunami, and the cooling operation of Reactors 1, 2 and 3 was made difficult by the debris from tsunami, and the accident was "caused by the simultaneous loss of multi-layered safety functions because of tsunami water, and loss of electricity and loss of cooling for a long period of time were the factors, says TEPCO.


As to the hydrogen explosions, it is unknown how hydrogen gas spread in the reactor buildings of Reactors 1 and 3, the company says, but it is possible that leak may have been from the flange of the Containment Vessels. TEPCO also says there was no explosion in Reactor 2; it was just mistaking the sound of Reactor 4 explosion.


For future countermeasures, TEPCO will put emphasis on the prevention of water leakage into the buildings and into important equipment, and on the prevention of the fuel core damage during the power outage.

Huh? It was a huge, mega earthquake that exceeded anyone's expectation and TEPCO admits it couldn't do anything to contain the accident, and yet there was no damage from the earthquake?

While the Mainichi reporter only parrots what TEPCO told the media, a more thinking person says the following about non-exploding Reactor 2, from a post in the news bulletin board called "Asyura" (quick translation, subject to revision later):


"Fukushima Nuclear Accident Investigation Report (Interim Report)", as published by TEPCO, is reported in the media in a piecemeal fashion. But I am appalled at this shoddy report.


The national government (NISA/Ministry of Economy, Trade and Industry) must have been notified beforehand. I am also appalled at the government that allowed TEPCO to announce such shoddy accident report.


There are so many things that I want to point out as false, but one of the most disgusting one is the "investigation report" on the Suppression Chamber of Reactor 2, which released the largest amount of radioactive materials into the atmosphere.

... (first point is not covered here; the following is his second point) ...

Quote [from the report]

「 2号機については、4号機の爆発音に前後して発生した圧力抑制室の圧力指示値が0MPa[abs]に低下したため、2号機の圧力抑制室付近で爆発的な事象が発生した可能性があると誤って認識したものと考えられる。

As to Reactor 2, the pressure gauge of the Suppression Chamber dropped to 0 MPa [abs], which coincided with the explosive noise in Reactor 4. This explosive noise in Reactor 4 was misunderstood as some explosive event near the Reactor 2 Suppression Chamber.


A damage to the Suppression Chamber would mean it would be open to the atmosphere, so 0 MPa [as] is not technically possible. However, considering the possibility of the instrument error, we cannot deny that there was some kind of damage to the Suppression Chamber that caused the pressure to drop."

「圧力抑制室の圧力計が0MP a[abs](真空)に低下した原因は、圧力計が故障していた可能性が高いと考えられる」

"It is highly likely that the pressure gauge was broken when it showed the Suppression Chamber pressure gauge dropping to 0 MPa [abs] (vacuum)."

My comments


The sentences are typical of those where the individual words used are clear but together they don't make sense. Very circumlocutory, you understand the language but you cannot tell what they want to say.


Intention is clear to me. Just like [former Chief Cabinet Secretary] Edano, TEPCO is going to say "We didn't say that", even after the facts will have come in.


The totally corrupt TEPCO, shamelessly, never uses the expression that indicates the Suppression Chamber was damaged; instead it talks about the event whereby "the pressure gauge of the Suppression Chamber dropped to 0 MPa [abs]".


What's most important in the Reactor 2 Suppression Chamber is not the number on the pressure gauge but how it broke and released a large amount of radioactive materials into the atmosphere.


If it was not an explosion, then what caused a hole in the Suppression Chamber? The accident investigation should address that point.


Skirting the "important issue" of what caused a hole in the Suppression Chamber, TEPCO writes about various reasons why the pressure gauge showed 0 pressure.

 事実が明らかになったときの予防線のように、「何らかの損傷が発生して圧力抑制室の圧力が低下した可能性は否定できない」と書きながら、次の段落では、「圧力抑制室の圧力計が0MP a[abs](真空)に低下した原因は、圧力計が故障していた可能性が高いと考えられる」と書いている。

After writing "...we cannot deny that there was some kind of damage to the Suppression Chamber that caused the pressure to drop", as if to make excuse when the truth finally comes out, TEPCO writes in the next paragraph "It is highly likely that the pressure gauge was broken when it showed the Suppression Chamber pressure gauge dropping to 0 MPa [abs] (vacuum)".


To write about the Suppression Chamber damage and the pressure gauge together, it is as if TEPCO was hoping that readers would somehow make sense of TEPCO's explanation. But I think it is possible that the pressure gauge could have been broken if the likelihood of "some kind of damage" occuring was high, not just damage to the Suppression Chamber that dropped the pressure.

 「圧力抑制室の圧力計が0MP a[abs](真空)に低下した原因は、圧力計が故障していた可能性が高い」と書いているが、急激に圧力計の値が低下したのだから“故障していた”という表現は微妙におかしい。

TEPCO writes "It is highly likely that the pressure gauge was broken when it showed the Suppression Chamber pressure gauge dropping to 0 MPa [abs] (vacuum)". But if the pressure gauge suddenly dropped, the expression that "the pressure gauge was broken" doesn't quite make sense.


One possibility is that the pressure gauge of Reactor 2 Suppression Chamber "happened to break" at the same time as the explosion in Reactor 4. Does TEPCO seriously believe in that kind of possibility?


Lastly, Reactor 2 was in a dangerous situation after the RCIC stopped, the water level inside the reactor dropping and core meltdown starting. A team of workers was working all night to avert a disaster.


It is said that the explosion in Reactor 4 was either on the 4th floor or the 5th floor. If there was a "big noise" in Reactor 2 as if something was broken, it must have been the basement where the Suppression Chamber is.


Is TEPCO insisting that workers at Reactor 2 couldn't tell the explosion noise on the 4th or 5th floor [of Reactor 4] from a "big noise" in the basement of Reactor 2?


Anonymous said...

Why not have the TEPCO bosses walk into the Reactor 2 facility that did NOT have an explosion and GET the pressure gages to check them. Note I say the TEPCO bosses. And they also should all move their families into the Fukishima area where citizens are being told to return to after the "cold shutdown on Dec 16th"--oh wait..the TEPCO families have all been moved to safer countries..such as Australia and South America.

no6ody said...

Sounds like T3PC0 is being intentionally vague. Since they will not explain what caused the largest radioactive release, and since they say they cannot tell which one of their reactors exploded and when, the whorium contamination must be severe. This is another time when what they will not talk about is much more important than what they will talk about. "False face must hide what the false heart doth know."

I hope you get your DSL back soon, AREVAMIRPAL! You do a great job keeping us informed about the worst nuclear reactor accident in history.

flyingcuttlefish said...

There is also an awful document about the clean up around Fukushima put out by the (US) IAEA.
They just say throw it all in a landfill with sonly scant decontamination.

I have some photos from the document (and a link to it) are on my blog. I used a screen grab to get them.

I hope you can help with translating into English what the sign says near the pile of bagged contaminated soil.

Genpachin said...

Here's a NHK World report in English on TEPCO's interim report:

I got confused with the part where TEPCO denies the quake had anything to do with the damage that led to the meltdowns, coz I thought they had already admitted the opposite back in May as reported here:

But I guess an anonymous source at TEPCO and official company standpoint issued in a report are two very different things... Let's not forget that TEPCO's goal with this report is to cover their asses rather than actually look into what really happened.

Anonymous said...

This continuing charade is grotesque. Today in Koblenz, Germany people are being evacuated while the 1.2 ton WWII bomb, discovered in the Rhine, is being dealt with. While in Japan the people of Fukushima are being prepared to move back home following the "cold shutdown" to be achieved on December 16? Can the people rise up and move out, to protect themselves, while the endless debate on where's the corium, plant safety, and no Immediate harm to human health rages on? The consequences of this disaster will never be quantified.Can we continue to avert our eyes and let the future be determined by cost/risk analysis and profit motive? For the sake of children everywhere, I hope not

Steveo said...

I been pounding trolls at HP, i think it is a good effort to protect those who would stop by and read their propaganda and but their concerns on the back burner. We all want an excuse to do nothing, and that ain't good.

Nothing is more insidious than radiation, you can't feel it, you can't smell it, you can't taste it (except for the reported metallic taste in mouth sometimes)­. It can affect your system in dozens of ways, fatigue, sore throat, disease, cancer, or just a general disruption of health.

To compare 20,000 dead to what could be millions or tens of millions negatively affected, diseased, and at some point just outright killed....­well, your argument is an emotional appeal for focus on immediate and stunning diasaster that we can see with our eyes. AND that is exactly my argument that nuclear IS SO MUCH MORE DANGEROUS because it is an invisible energy, whose effect is being downplayed by an entrenched monopoly that will HAVE NO SOURCE OF INCOME when nuclear is eliminate. Better get on roof and learn how to install some solar panels. We are taking your nuke cheese away and you better be ready to adapt.

Supporting nuke is a crime against humanity. STOP THAT!

Steveo said...

Permanently found at my radiation conglomeration, lots of good info, not nicely organized, but a great resource, check it out.

Bore 8 holes, 1 meter diameter and 6000 meters deep, 2 go by each reactor. Cross connect those 2 at every 100 meters, put a lid over the top, piled with 100 tons of large diameter rocks, like .5M, on a wire cage. Now side drill to the expected corium location and guide the corium in the shaft. the second shaft will serve as an
expansion chamber for superheated air/steam should the corium contact water. The large gravel will serve as a deflection so we don't make a power shot of nuclear steam 1000's of meters into the atmosphere.

Done deal. Hope that the corium doesn't come back up after mixing with volcanic magma.

Send a radiation hardened video camera down one last time and take a video to show all current nuclear profession people what hell looks like.

Backfill the holes with chopped up radioactive debris, fill the top 100 meters with soil and stones.

Anonymous said...

Some historical aside on Japanese fishermen and radioactivity,

".. Then in 1974, the Japanese launched their ill-fated Mutsu, a nuclear-powered research ship, which developed a leak in its reactor system during sea trials. Japanese fishermen, concerned over the possible contamination of seafood, refused to let the ship dock, and it drifted in the waters of the North Pacific for five weeks. "

The Silent Saga of the Nuclear Navy

Steve From Virginia said...

Thanks for the brief look at the report. I have it on my computer, (I don't understand Japanese) but a lot of it is old news for anyone who has been following events since March 11; there are plenty of charts and tables.

I didn't see much of the data that they (Tepco) released earlier as part of the reactor log data dump that covered the period during and after the earthquake. This leaves an information gap: their reactor temperature data for the most part begins March 21. This may be because of no power until that time, but temps of the critical period from Mar 11- 15 need to be made public.

What is needed is a board of inquiry as would be the case after a shipping incident. Until that time, the information is not going to be very useful.

Anonymous said...

? was NR#2 fizin' last month?

Anonymous said...

During the March meltdown TEPcock started lying.
The TEPcocksucker's lying has never stopped.

They forget, they are over exposed to radiation, too! Sianara boys!

Anonymous said...

"Steveo said...


That's all very thought out... but come on now Steveo, you know as well as I do that nothing anyone suggests is going to derail TEPCO's determination to clean and fix those exploded and herniated reactors and have them loaded up and running by early 2013 for another 20 years. We're NO.1 We're NO.1 !!!

Anonymous said...

"clean and fix those exploded and herniated reactors and have them loaded up and running by early 2013"


Anonymous said...

If TEPCO say the was no explosion then you can bet there was an expolsion, just reverse everything they say and you will be closer to the truth...  Its Orwellian with Tepco... 2+2=5 in Japan

Anonymous said...

So there was no earthquake, no tsunami, and the fukushima plant is working as usual.


Anonymous said...

"So there was no earthquake, no tsunami, and the fukushima plant is working as usual."

And "TEPCO"s pridereputation (note the quotes) is undamaged.

And how is this possible? Because their 'society' is Older than yours.

That's also why they're entitled to burning radioactive debris, because they're Older than you.

Don't like their Lost Decade bankster attitudes?

Anonymous said...

A little more on the Mutsu,

Note the amount of effort at downplaying streaming neutrons as not as undesirable as leak of radioactivity.

"So there was no earthquake, no tsunami, and the fukushima plant is working as usual."

'And because the Outsiders continue to focus upon this, we will use their attention against them.' The Society

Anonymous said...

Hélios said...

Poor Arevamirpal, without power...?!

Come back to us soon, we need you...

Anonymous said...

This entire situation is going very badly. If I know the American government(and I do) they will turn on Japan and say that Japan has been lying all along.

America will then, again, demonize the Japanese culture for their benefit.

This is all going to end badly.

robertb said...

Nuclear power needs to be stopped. It's not clean and green. It's pretty much the worst way you could ever choose to create power. The nuclear industry is just a bunch of assholes. They need to be stopped before they kill us all

Anonymous said...

I agree. The nuke industry has proven beyond a doubt that they are morally depleted nincompoops that can't control what they have created and don't know or care about the consequences. High time the bastard SOBs get their due.

Anonymous said...

I think youre missing a technical point with your analysis.

The point is that if the pressure gauge fell to 0 absolute, which is a complete vacuum, then the gauge clearly went open circuit, since there is no provision for a vacuum in the plant, and further its completely impossible for a vacuum to exist over hot water, which is in the suppression chamber (which would boil, produce steam and destroy the vacuum). The sensor cannot be relied on at all anymore to provide a reading, a reading like that indicates failure. This is very common if you are used to dealing with remote sensors like this. It means one thing only - dead sensor / wiring. All the time. Every time.

Hence there is no reason to believe that the pressure dropped in the suppression chamber when R4 exploded - hence there is no reason to believe there is a hole in the suppression chamber at all. The sensor is reading 0 - its dead. The reading of 0 was the only indicator to think that there was a hole in the suppression chamber, but that assumption is clearly wrong to anyone remotely technical.

What do we know? R4 exploded and at the same time the pressure transducer in the suppression chamber of R2 went to 0 - meaning it failed. Whats the most likely hypothesis? R4 exploding damaged R2s pressure sensor. Perhaps a shock wave travelled through the common stack piping from R4 to R2 and damaged the sensor? Perhaps a piece of debris was forcefully ejected by the explosion at R4 and damaged the wiring for R2s pressure sensor? I dont know.

But what I do know is that assuming a hole appeared in R2s suppression chamber because the pressure reading dropped to a total vacuum is completely wrong. The only conclusion that can be drawn, and its a firm one, is that the pressure sensor (or the wiring for it) in R2 was damaged when R4 blew up.

One last thing. Imagine a suppression chamber full of pressurised hydrogen and oxygen exploding. Does anyone really think this would produce a little 8 inch hole in the suppression chamber as has been reported in the MSM? It would totally shatter the suppression chamber and there would be a far greater release of radioactive material I believe. This is speculation on my part so reader beware. You heard it first here...

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