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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 228  

post #2271 of 2836
Quote:
Originally Posted by Epitope View Post
It is evaporating. The reactors are on the verge of melting down. They are boiling off the water as fast as they can pump it in.
I wonder what they'll do about the salt and other solutes left behind?
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post #2272 of 2836
Quote:
Originally Posted by _02 View Post
So, pardon me again, would not this steam include.... radioactive material?

There likely are some particles of uranium and transuranics in the steam from reactors that have partial melting. Maybe enough to build one uranium bullet.
post #2273 of 2836
You know what I don't understand is, it can't just be the fact that the water pumps are not powered. If it was simply an issue of powering the pumps, there are many solutions that anyone with a simple understanding of electronics could implement.

For example, turn on either reactor 5 or 6.
Or if they are really desperate, go get some copper cable, make a voltage transformer, (google how to make one, it's really easy) and hook up every single car in the parking lot to this transformer. That will be enough power for the pumps.

If the pumps themselves are damaged, then no amount of power lines or jiggery pokery will get them working, aside from actually repairing them.
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post #2274 of 2836
What surprised me is that the electricity used in the plant doesn't come from the plant itself. It's cheaper just to buy it from the national grid than step it down just for their own use.
post #2275 of 2836
Quote:
Originally Posted by weidass View Post
You know what I don't understand is, it can't just be the fact that the water pumps are not powered. If it was simply an issue of powering the pumps, there are many solutions that anyone with a simple understanding of electronics could implement.

For example, turn on either reactor 5 or 6.
Or if they are really desperate, go get some copper cable, make a voltage transformer, (google how to make one, it's really easy) and hook up every single car in the parking lot to this transformer. That will be enough power for the pumps.

If the pumps themselves are damaged, then no amount of power lines or jiggery pokery will get them working, aside from actually repairing them.
Reactors 5 and 6 were and still are offline. Odds are those pumps require some serious voltage/current...I almost would not be surprised if they need 3-phase continuous power due to how much water they are supposed to move so far and so fast. I believe the transformers for said pumps are at least partially flooded due to the tsunami....so it isn't close to being like jump-starting a car in terms of getting things working.
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post #2276 of 2836
Quote:
Originally Posted by Boyboyd View Post
What surprised me is that the electricity used in the plant doesn't come from the plant itself. It's cheaper just to buy it from the national grid than step it down just for their own use.
It is probably a safety precaution. The odds of needing to scram the reactors, and not have enough power for the controls etc, is higher than the hookups to the grid going kaput.
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post #2277 of 2836
Quote:
Originally Posted by Skripka View Post
It is probably a safety precaution. The odds of needing to scram the reactors, and not have enough power for the controls etc, is higher than the hookups to the grid going kaput.
I never thought about that, that's a good point.

It's also true at coal power stations, but i suppose they need power too if the generator fails.
post #2278 of 2836
Quote:
Originally Posted by weidass View Post
You know what I don't understand is, it can't just be the fact that the water pumps are not powered. If it was simply an issue of powering the pumps, there are many solutions that anyone with a simple understanding of electronics could implement.

For example, turn on either reactor 5 or 6.
Or if they are really desperate, go get some copper cable, make a voltage transformer, (google how to make one, it's really easy) and hook up every single car in the parking lot to this transformer. That will be enough power for the pumps.

If the pumps themselves are damaged, then no amount of power lines or jiggery pokery will get them working, aside from actually repairing them.
The water pumps at a single chernobyl reactor required a 5mW deisel generator to turn them. I'm not sure how much power these pumps require, but it sure isn't something you're going to be running off a bunch of car batteries!

My guess is that the pumps themselves are damaged. They already said that the explosion at reactor #3 damaged 4/5 of the pumps, and the fifth failed shortly afterward.

Now that I think about it... how the heck were they powering those pumps to find out they were damaged?
post #2279 of 2836
Quote:
Originally Posted by SgtSpike View Post
The water pumps at a single chernobyl reactor required a 5mW deisel generator to turn them. I'm not sure how much power these pumps require, but it sure isn't something you're going to be running off a bunch of car batteries!

My guess is that the pumps themselves are damaged. They already said that the explosion at reactor #3 damaged 4/5 of the pumps, and the fifth failed shortly afterward.

Now that I think about it... how the heck were they powering those pumps to find out they were damaged?
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.
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post #2280 of 2836
Quote:
Originally Posted by SgtSpike View Post
The water pumps at a single chernobyl reactor required a 5mW deisel generator to turn them. I'm not sure how much power these pumps require, but it sure isn't something you're going to be running off a bunch of car batteries!

My guess is that the pumps themselves are damaged. They already said that the explosion at reactor #3 damaged 4/5 of the pumps, and the fifth failed shortly afterward.

Now that I think about it... how the heck were they powering those pumps to find out they were damaged?
thats what i want to know too...wonder if they had a single generator running for a while that survived the wave
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