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-   -   Japan nuclear power stations (https://www.pprune.org/jet-blast/445613-japan-nuclear-power-stations.html)

Yamagata ken 14th Mar 2011 13:47

Japan nuclear power stations
Onagawa nuclear power plant, the closest to the Miyagi earthquakes is operating as normal. The Onagawa is powerplant is operated by Tohoku Power, not Tokyo Power. It is situated well above sea level and was not effected by the tsunami. Tohoku Power has demonstrated that nuclear power plants if properly planned can withstand the 5th most powerful earthquake recorded to date, and the following tsunami.

MagnusP 14th Mar 2011 13:52

Ken, glad to see you're well and keeping us updated.

I thought that Onagawa #3 had suffered turbine damage in the earthquake.

El Grifo 14th Mar 2011 13:54

Fukushima and beyond
Maybe we can pick up on the Nuclear issue here after bowing out respectfully from the Main Tsunami Thread.

Despite confident statements by several, regarding the pressure releases, the IAEA say different. One can only assume that the explosions were caused by the ignition of the released gases in the containment building placed there in an effort to minimise contamination. This effort has obviously failed :-

Japan Earthquake Update (14 March 2011, 05:15 CET)
Based on information provided by Japanese authorities, the IAEA can confirm the following information about the status of Units 1, 2, 3 and 4 at Fukushima Daini nuclear power plant.

All four units automatically shut down on 11 March. All units have off-site power and water levels in all units are stable. Though preparations have been made to do so, there has been no venting to control pressure at any of the plant´s units.

At Unit 1, plant operators were able to restore a residual heat remover system, which is now being used to cool the reactor. Work is in progress to achieve a cold shutdown of the reactor.

Workers at Units 2 and 4 are working to restore residual heat removal systems.

HuntandFish 14th Mar 2011 13:55

Im sure that over the coming weeks and months the safety of nuclear power will be widely and mostly inaccurately discussed .
For what its worth the plants that are in trouble appear to be older BWR designs relying on active cooling , unlike the latest PWR designs which have passive failsafe cooling .
Yamagata ken do you know what design the Onagawa plant is?

txdmy1 14th Mar 2011 13:56

techie stuff
Information Bridge: DOE Scientific and Technical Information - Sponsored by OSTI

handsfree 14th Mar 2011 14:00

Info on Onagawa plant

Onagawa Nuclear Power Plant - Wikipedia, the free encyclopedia

txdmy1 14th Mar 2011 14:01

much more discusion here
Japan Battles Partial Nuclear Meltdown - Slashdot
and here
Third Blast At Japan's Fukushima Nuclear Plant - Slashdot

Nemrytter 14th Mar 2011 14:04

El Grifo, you're talking about the wrong power plant!!
Fukushima Daini (II) is the one you mention in the report, but the one we're talking about is Fukushima Daiichi (I).

Yamagata ken 14th Mar 2011 14:09

Thank you :)

El Grifo 14th Mar 2011 14:15

Fukushima and beyond
Who are the "we" to which you refer ?

dead_pan 14th Mar 2011 14:30

Damage to Unit 3's exterior building is much more substantial than Unit 1, from news footage I've just seen.

txdmy1 - still interested to hear your views on the situation Fukushima, if you're willing/able.

txdmy1 14th Mar 2011 14:41

it's all in a state of flux, I read and understood most of what I posted in the techie link above, beginning to think that unless they can get it cooled they are .....

dead_pan 14th Mar 2011 14:59

One man's nuclear disaster is another man's investment opportunity... I trust you'll donate some of your profits to the relief effort.

So much for keeping the tone of discussion up :(

HuntandFish 14th Mar 2011 15:00

Yep tend to agree with you that nuclear is inevitable but I also think this will delay UK New Build . Also a bit early to buy uranium mining

HKPAX 14th Mar 2011 15:17

A thought for the people working on at these nuclear plants trying to fix things: quiet heros methinks.

ORAC 14th Mar 2011 15:56

Tim Worstall: The Guardian editorial using Fukushima to tell us all how dangerous nuclear is :D:D
technicians were last night battling to save from meltdown nuclear reactors with failed emergency cooling systems. Only a few weeks away from the 25th anniversary of the world’s worst nuclear accident, no one can be under any illusions of what could result if the technicians lose their battle.
Complete and total bollocks.

Absolutely the worst that could happen, absolutely the worst possible outcome, is that the reactors end up as a puddle of cold metal at the bottom of their containment vessels.

That’s it. The chain reaction is already shut down. All that is left is the residual heat which the water is cooling. If the water doesn’t cool it then yes, the rods and fuel might melt. At which point they might stay liquid until they hit that 2-3 metres of reinforced concrete underneath them where they will solidify.

So the worst possible outcome is a 40 year old reactor which cannot be used again.

There cannot be a nuclear explosion, there is no possibility of a fire as at Chernobyl (because there is no graphite to catch fire). We can have, as we have had, a hydrogen explosion, but that’s outside the reactor and outside the containment vessel. No radioactivity released as a result.

Just to give you an idea of the “raised levels of radioactivity” that have been reported. Between 500 and 1,000 microsieverts per hour. The top end of that range is about half what you would get if you had a CT scan.

Or, if we use the Banana Equivalent Dose (you do indeed absorb radiation from eating a banana, a pile of bananas will indeed set off a radiation detector) the mid range there is like eating 20 bananas a day for a year. One banana a day for a year is around 35 microsieverts.

So, we’ve just had the fifth worst earthquake in the past century, the 7 th worst we have on record, a 30 foot wall of water sweeping in at 500 miles an hour and the worst part of the nuclear power system is that if you were standing right there, right at the plant, you might get the same radiation dose as a fruitarian?

And you want to use this to tell us that nuclear power is dangerous?

Incalculable danger. :ok:

.......My prayers go out to Nippon and its people. But the only serious radiological threat they face? Gojira.

G-CPTN 14th Mar 2011 15:59

Have any casualties even yet been directly attributed to Japan's nuclear plants?
At least one crane driver and two employees declared 'missing' - from the first explosion . . .

El Grifo 14th Mar 2011 16:07

Fighting talk ORAC !

I genuinely and sincerely hope you are right.

El G.

handsfree 14th Mar 2011 16:08

...and the latest explosion (reactor #3) injured 11, one of them seriously.

With regards to the likely outcome of any meltdown, I'm with ORAC. I thought the Guardian was incredibly misleading.

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