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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 229  

post #2281 of 2836
Quote:
Originally Posted by SgtSpike View Post
Now that I think about it... how the heck were they powering those pumps to find out they were damaged?
I would hope they have some sort of backup like a diesel generator. I work in a college science lab building that is 8 stories tall and employs a few hundred scientists. The entire thing is on a diesel backup. It's pretty cool to be here during a thunderstorm and watch the rest of campus lose power yet we still get to keep all of our lights.

The generators are huge, they look like a yellow semi truck trailer missing wheels.
    
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post #2282 of 2836
Quote:
Originally Posted by Epitope View Post
I would hope they have some sort of backup like a diesel generator. I work in a college science lab building that is 8 stories tall and employs a few hundred scientists. The entire thing is on a diesel backup. It's pretty cool to be here during a thunderstorm and watch the rest of campus lose power yet we still get to keep all of our lights.

The generators are huge, they look like a yellow semi truck trailer missing wheels.
They did have backup generators at Fukushima as well, but they were destroyed by the Tsunami.
Quote:
Originally Posted by sLowEnd View Post
That's a lot of power.

I wonder why they don't have multiple smaller pumps that require less electricity? Wouldn't that be a little more redundant? (Which would be good)

But then again, I don't know anything about designing a nuke plant.
I thought it was 5mW to run all of the pumps for one reactor, but it's 5.5mW to run ONE pump. Each reactor at Chernobyl had three backup generators capable of generating 5.5mW each. The total hourly water flow required across the Chernobyl plant was 12 million gallons, or about 3300 gallons/second.

EDIT: Found this on wikipedia:
Quote:
Boiling water reactors have steam-turbine driven emergency core cooling systems that can be directly operated by steam produced after a reactor shutdown and can inject water directly into the reactor. Using these pumps, boiling water reactors can provide water without electrically driven pumps, but only while the reactor is at pressure.
It doesn't really explain why these pumps haven't been running this entire time though, but it's possible these are the failed pumps they were talking about with regards to reactor #2 when reactor #3 exploded.

EDIT 2: Also, this:
Quote:
After the failure of the diesel generators, emergency power for control systems was supplied by batteries that would last about eight hours.[66] Batteries from other nuclear plants were sent to the site and mobile generators arrived within 13 hours,[67] but work to connect portable generating equipment to power water pumps was still continuing as of 15:04 on 12 March.[68] Generators would normally be connected through switching equipment in a basement area of the buildings, but this basement area had been flooded.[64] It had been conjectured that a new powerline to the complex would revive some of the electric cooling system pumps that have failed.[69] After subsequent efforts to bring water to the plant, efforts would shift to that strategy eventually resulting in cable emplacement reported at approximately 08:30 UTC.

Edited by SgtSpike - 3/18/11 at 11:55am
post #2283 of 2836
Nevermind... I was off by an order of magnitude.

Still, 3,300 gallons per second is absurd.
Edited by _02 - 3/18/11 at 12:00pm
    
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post #2284 of 2836
Quote:
Originally Posted by _02 View Post
For scale, 3,000 gallons is a swimming pool that is approximately 50 feet long, 20 feet wide and 13 feet deep at one end. PUmping that per second! That's insane.

edit wait...
when you think about it. with how hot these rods are, and they are just making all the water dumps from the copters vaperize instantly, it makes sense that they would have to use that much water to submerge these things.
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post #2285 of 2836
CNN reporting low lvl radiation from japan has reached California.
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post #2286 of 2836
Quote:
Originally Posted by Acroma View Post
CNN reporting low lvl radiation from japan has reached California.
In amounts "billions of times" lower than those which pose any health risk.
    
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post #2287 of 2836
Quote:
Originally Posted by _02 View Post
In amounts "billions of times" lower than those which pose any health risk.
From what I understand this is from day 1. With all the lies about how bad it actually is you never know... I don't think it will be that bad but we won't know until it's 100% over.
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post #2288 of 2836
Quote:
Originally Posted by farmdve View Post
Pardon me as well, but if a lot of water is evaporating, doesn't that mean there will be heavy rains?
Only if it was heavy water - which is isn't in this case...
post #2289 of 2836
Does anyone know of a site where I can see the radiation levels in realtime in California? I really don't care much about it for myself but I'd like to know if it starts to increase b/c of my daughter.
    
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post #2290 of 2836
Quote:
Originally Posted by Acroma View Post
CNN reporting low lvl radiation from japan has reached California.
California seeing no radiation level increase - Reuters
     
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