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Old October 23rd, 2012, 11:37 PM   #41
Beber
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Quote:
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Highly interesting! Does anybody know what material is used to cover up the radiation? I doubt they'll pump concrete into the dome.
There are two layers of cladding. External cladding prevents external events (meteorological mainly) from damaging the structure. Internal cladding prevents radioactive waste (and dust) to get out, which is the main problem that the Chernobyl N°4 reactor is currently facing.

Materials used are stainless steel (external) and polycarbonate (internal) to prevent the accumulation of radioactively contaminated dust. There also are layers of thermal insulation and regular steel.
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Old October 24th, 2012, 06:37 PM   #42
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Thank you!
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Old October 24th, 2012, 07:22 PM   #43
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This is a very interesting thread! I have one question though, how do people work in that environment? Is there a work roter to stop the effect of radiation or has this threat gotten less over the years?
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Old October 24th, 2012, 08:52 PM   #44
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There are many precautions taken toward workers safety. On site, there are 50 people who are qualified in radiation protection and that only works to ensure that the working area is safe. There has been a lot of preliminary work to study whether or not the erection site was viable. Radiation is lower near the ground (which has been cleaned), that's also why we're seeing this lifting mechanism, since it prevents higher altitude work.

Every worker has a suit designed to work in this environment, with two dosimeters. The whole site is monitored in real time to ensure safety. For work that is done close to the existing sarcophagus, workers are protected behind concrete or lead walls. Workers can either chose to work 5 days a week (with the weekend free), or by cycle of 15 days (15 days of work, 15 days of holidays). That's the Ukrainian law.
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Old October 25th, 2012, 09:18 PM   #45
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Weekly update from ChNPP.


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Last edited by Beber; November 28th, 2015 at 08:07 PM.
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Old October 26th, 2012, 02:23 PM   #46
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Highly interesting to see this actually happening how.
I have a question, on the side of the soviet sarcophagus there is like scaffolding and a crane like structure(?) could someone tell me what it's used for? Thank you
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Old October 26th, 2012, 03:06 PM   #47
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Another question, once the new sarcophagus is in place, what happens if the old one eventually decay, crumble and collapse?
Would the new one be able to contain all the dust and radioactive decay?
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Old October 26th, 2012, 06:38 PM   #48
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Containing such an event is one of the reasons why the new shelter is built, isn't it?
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Old October 26th, 2012, 07:38 PM   #49
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Quote:
Originally Posted by Manchester77 View Post
Highly interesting to see this actually happening how.
I have a question, on the side of the soviet sarcophagus there is like scaffolding and a crane like structure(?) could someone tell me what it's used for? Thank you
It's the Designed Stabilisation Steel Structure. They added that structure a few years ago to reinforce the existing sarcophagus, that was showing severe weaknesses.

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Another question, once the new sarcophagus is in place, what happens if the old one eventually decay, crumble and collapse?
Would the new one be able to contain all the dust and radioactive decay?
One of the goal of the New Safe Confinement is to dismantle the existing sarcophargus to avoid that risk. The NSC is equipped with heavy lifting equipment (four 155t bridge cranes) and radiation shielded carriages, that will allow workers to enter the reactor safely. You can find more about this phase in this video.
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Old October 26th, 2012, 08:53 PM   #50
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That makes sense, thanks for the info
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Old October 26th, 2012, 08:56 PM   #51
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Thank you Beber. You seem very knowledgeable about the topic, am I wrong to assume you are part of the design team?

I understand they will dismantle the existing sarcophagus, but why didn't they choose instead to reinforce it, once the NSC in in place? That would have been two confinement layers instead of just one.
Also, what will happen with the remains of the old sarcophagus once it's dismantled? Stored inside the NSC for ever? Decontaminated and used for road work?
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Old October 26th, 2012, 10:11 PM   #52
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I'm not related in any way to this project. I've been following it for years, and I gathered as much information as possible.

There are many reasons why they won't reinforce the existing sarcophagus while the NSC is in place. The NSC is expected to last a hundred years, which is way longer than the previous sarcophagus, no matter how well they would reinforce it. The NSC in itself is built to confine the radioactive materials, so any repair work on the sarcophagus would be useless, or "overkill". Plus, it would cost money, and they don't have any (financing the NSC already took so much time, getting a single more euro would take years).

But the main problem is that the current sarcophagus is weak in its foundations. Or to be precise, its lack of foundations. It was built over the reactor room, which obviously hadn't been cleaned or hadn't had any pre-work done. So the three huge beams that hold the roof are not stable. By the way, this is why the DSSS, that Manchester77 spotted, was built.

The first sarcophagus was built as an immediate response to a massive threat. It was designed to be a temporary solution, but once it was up, no one wanted to pay for a more permanent solution. As of today, the existing sarcophagus is more of a threat than a solution.

The radioactive wastes are a major problem in the Chernobyl area at the moment. But as far as the sarcophagus is concerned, there will be a specific area under the NSC dedicated to waste treatment. They will first fragment it into smaller pieces, and then decontaminate it with various common procedures. After that, it's still unclear about where the waste will go. A multi million euros waste storage facility was built a few years ago on site, but its design was faulty, and it's now totally useless.
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Old October 27th, 2012, 11:58 PM   #53
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Thank you Beber for the explanations. Much appreciated.
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Old November 2nd, 2012, 08:10 PM   #54
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Weekly update from ChNPP.


(link to album)

Last edited by Beber; November 28th, 2015 at 08:08 PM.
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Old November 9th, 2012, 07:47 PM   #55
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Weekly update from ChNPP.


(link to album)

Everything looks good. Lifting towers are all up.

Last edited by Beber; November 28th, 2015 at 08:08 PM.
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Old November 10th, 2012, 02:37 AM   #56
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Brilliant idea! Risk management at its best.

When I hear or read the word Chernobyl I always wonder if people will ever return to the city and actually live there. This could be a beginning.
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Old November 11th, 2012, 12:43 AM   #57
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lmao, do they realise if something goes wrong with this confinement, it'll be another chernobyl? it'll release a lot of radioactivity into the environment
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Old November 11th, 2012, 01:31 AM   #58
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The current sarcophagus has gaps so wide you could drive a car through them, and the wind blows freely through and out of the confinement.

At least the new one will leak a lot less radioactivity in the atmosphere.
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Old November 11th, 2012, 01:39 AM   #59
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Thanks everyone for answering
As it built so poorly because the soviets were trying to keep it a secret idk could someone explain (I find the whole thing fascinating but I have very little knowledge of it)
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Old November 11th, 2012, 04:43 AM   #60
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Quote:
Originally Posted by Substructure View Post
The current sarcophagus has gaps so wide you could drive a car through them, and the wind blows freely through and out of the confinement.

At least the new one will leak a lot less radioactivity in the atmosphere.
fair enough
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