Merged 8.8 quake in Sendai, Japan

a_unique_person said:
The one in question is sitting right on the coast, that was why the backup generators failed.
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It's also a reason why, after the failure of these generators, there is a readily available source of seawater which can be used to cool down the reactor core.
 
technoextreme said:
How much hydrogen do these things produce. As something that really isn't even close to being classified as an explosive it sure as hell did a heck of a lot of damage to the one plant.
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Potentially hundreds of cubic meters.

Think "Space Shuttle Main Engines" and you get a sense of how much energy there can be in hydrogen.
 
technoextreme said:
Except for the fact that you are displaying quite an astounding ignorance of basic engineering. I'll give you a little hint here. They were designed to withstand an earthquake. They were designed to withstand a tsunami just like the redundant systems were designed to prevent an airline crash.
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What does "designed to withstand a tsunami" mean? The rest of the plant was safe from the tsunami, but the backup generators were in a place that was more vulnerable to inundation.
 
MattusMaximus said:
It's also a reason why, after the failure of these generators, there is a readily available source of seawater which can be used to cool down the reactor core.
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Which is like closing the door after the horse has bolted. The seawater is a last ditch measure, that will render the plant inoperable. Nuclear is now screwed, and it didn't need to be.
 
BenBurch said:
Potentially hundreds of cubic meters.

Think "Space Shuttle Main Engines" and you get a sense of how much energy there can be in hydrogen.
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Its actually not that much energy which is why I'm entirely surprised as to the fact that its blowing parts of buildings off. Thats a lot of hydrogen.
BenBurch said:
The Tsunami was higher than the expected maximum level.
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Tis one of the most major problems in engineering and one that apparently most people don't actually comprehend all that well.

a_unique_person said:
Which is like closing the door after the horse has bolted. The seawater is a last ditch measure, that will render the plant inoperable. Nuclear is now screwed, and it didn't need to be.
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Yes because the Japanese government really cares about those last two weeks of operating time.
 
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technoextreme said:
Except for the fact that you are displaying quite an astounding ignorance of basic engineering. I'll give you a little hint here. They were designed to withstand an earthquake. They were designed to withstand a tsunami just like the redundant systems were designed to prevent an airline crash.
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They were designed to withstand a less powerful earthquake and a weaker tsunami.

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'Why I am not worried about Japan’s nuclear reactors.'
 
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It's really strange, I see the "breaking news" 6.2 quake, new tsunami warning, but the USGS monitoring site shows no new 6.2 quake and the last 6.0 quake had no tsunami, (neither have any of the aftershocks).

USGS Japan area current EQ list


Makes me think this is just because more news media folks are on scene now and they are there to report on the frequent warnings for every significant aftershock.
 
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BenBurch said:
OK, didn't know that.

This building was sealed sheet metal over a frame. The sheet metal blew off. This is the outer building that encloses the containment vessel.
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Actually, I wonder if its possible to use leak detection using the hydrogen produced. That element is a shifty little thing only second to helium (I think I might have this backwards) in its ability to move around in cracks.
 
Japan Earthquake
huge debris field 8 miles east of the Japanese coast line. Houses, barges, oil slicks, capsized boats, and cars fill the mile wide debris field.
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Cars still afloat? There must be some people alive in this debris field, unless they've died from the cold.
 
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