typodupeerror

## 30 Years To Clean Up Fukushima Dai-Ichi342342

• #### Re: (Score:2)

Coal kills 10,000 people a year.

Now tell me nuclear power isn't economical.

• #### Megalitres? wtf? (Score:2)

Whats wrong with saying 9.5 million litres? Why use an obscure term like megalitres? Is it just because americans don't get the metric system?

• #### Re: (Score:2)

Why even use liters at that point... cubic meters is much more descriptive... or Tons if you must!

• #### Re: (Score:2)

9.5ML is an SI unit. The 55 kilotons should be expressed as 55ML (using water's density=1000 kg/m^3). So we can see at a glance that they need 6 tankers at the moment.

We avoid exponents this way. Or the short scale/long scale "billion issue".

• #### Re: (Score:3)

So how much is that in acre-feet?
Or footballfield-inches?

• #### Re: (Score:2)

I did stop to wonder how much a megalitre was :)
• #### Re: (Score:3)

Megalitres is an obscure term? I suppose if you're american. Pretty much every other country that uses SI or a form of SI along side imperial(Canada), uses it for large fluid volumes.

• #### Re: (Score:2)

Megalitres is an obscure term? I suppose if you're american.

We think of volume primarily in terms of Budweiser cans. Tallboys mainly.

• #### I'm assuming... (Score:4, Insightful)

on Friday April 08, 2011 @12:41PM (#35759462) Journal
I'm assuming that the eventual plan will involve some sort of distillation or RO process: 55,000 tons of water is not something you would want to have to safely entomb somewhere; but the actual volume of long-term nasties must be fairly small(worst case, it could not be greater than the volume of the fuel on site, and any materials that it has been in long term contact with for a sufficient time to render them radioactive, and it doesn't appear to be worst case).

While not terribly cheap, the technology for separating dissolved compounds from water(to fairly extreme degrees of purity, in the case of water for lab/analytic use) is very much off-the-shelf. Similarly, gross screening of a volume of treated water for radioactives should be doable with a Geiger counter, and fine screening should be within the realm of any decently equipped testing laboratory.

It isn't going to be cheap, and the end result will be a small pile of serious unpleasantness and a rather larger one of equipment that isn't worth decontaminating; but it doesn't seem like a fundamentally hard problem.
• #### Radioactives in water not the big problem. (Score:5, Informative)

on Friday April 08, 2011 @01:35PM (#35760264) Homepage

While not terribly cheap, the technology for separating dissolved compounds from water(to fairly extreme degrees of purity, in the case of water for lab/analytic use) is very much off-the-shelf.

Right. That was done at Three Mile Island. Bear in mind that you can't make water itself radioactive; hydrogen and oxygen don't have any radioactive isotopes with long half-lives. (The longest, 15O has a half-life of 122 seconds, so it's gone within an hour.) All the radioactivity is in dissolved solids. So the process looks a lot like desalinization - the water is forced through membranes that catch all the solids. Eventually, you have dry salts, which you put in casks and bury in some desert or hard-rock cave.

That's the easy part of the problem, though. Remember that the reactor buildings are wrecked from the hydrogen explosions. All the fuel rods in the spent fuel pools have to be carefully moved to some other location, probably newly built spent fuel pools nearby. In 3-5 years, they'll have decayed enough for dry storage, and they'll be put into casks. They can then be moved off site.

This leaves the reactors themselves. Units 1,2, and 3 still haven't reached cold shutdown. Until that's achieved, cleanup can't even start. The situation isn't even close to safe until all three reactors are in cold shutdown, not leaking, and have redundant cooling. Look at the status reports at the Japan Industrial Atomic Forum [jaif.or.jp]. Until all the red squares turn yellow, there's a sizable risk of things getting worse.

Decommissioning the damaged reactors will be really tough. They're too damaged to de-fuel, and they need constant cooling, so they can't just be encased in steel and concrete. I don't know what will be done.

This is much, much worse than Three Mile Island. At TMI, the control room was up and running through the whole episode, they reached cold shutdown in a few days, they never had an explosion, and radioactivity was confined to the containment vessel.

• #### Re: (Score:2)

I wonder if it would be feasible to use one of the intact reactors on the site (unit 5 or 6) to boil the water.

• #### Make an exception (Score:2)

Buy a barge, fill it up, float it to the middle of the Pacific and scuttle the ship. I think the international community can make an exception this time, all things considered. Other 'viable technical solutions' carry their own risk, and those risks will be continuous over the next 5 years or more, near population centers instead of out in the middle of the ocean.
• #### Re: (Score:2)

Not like I have a solution to pose, but given that air currents in a hurricane move tons of cloud masses through thousands of kilometers, what's to prevent ocean currents from doing the same and poisoning our fish?

Peeing in the pool does not just affect the pee-er's area. Remember the Big Gulf Oil Spill of 2010?

• #### 12 billion (Score:2)

Seems surprisingly cheap to me for what is essentially the #1 or 2 largest nuclear disaster of all time.
• #### Recovery of conventional PS, reinforcement of NPS (Score:4, Informative)

on Friday April 08, 2011 @02:19PM (#35760964)

TEPCO has put back online units 3, 2 and 5. From their press release:
http://www.tepco.co.jp/en/press/corp-com/release/11040809-e.html [tepco.co.jp]

-Kashima Thermal Power Station Units 6: shutdown due to the earthquake
-Kashima Thermal Power Station: Units 2 resumed generating power at
5:45 pm April 7th.
-Kashima Thermal Power Station: Units 5 resumed generating power at
9:27 am April 8th.

Yesterday they put online unit 3, I'm impressed that they managed to put those units online in such a short time even with the ground still shaking.

Also, they put forward a plan to reinforce Kashiwazaki-Kariwa NPS, the largest in the world, in accordance with the new, upgraded regulations for the operation of NPS in Japan, in http://www.tepco.co.jp/en/press/corp-com/release/11040708-e.html [tepco.co.jp] and graphics http://www.tepco.co.jp/en/press/corp-com/release/betu11_e/images/110407e19.pdf [tepco.co.jp]

The new walls aside from protecting the buildings from tsunami waves, I think they will act as an additional barrier in case the reactor building suffer fire or explosions, like the one in unit 3 in Fukushima, that sent debris damaging several buildings around the unit, I don't know if they will provide some radiation protection to workers in case of emergency.

The amended regulations say:
http://www.tepco.co.jp/en/press/corp-com/release/betu11_e/images/110408e3.pdf [tepco.co.jp]

Article 17-2 The organization shall draw up plan for each of the folloeing in
order to improve system for maintaining reactor facilities under circumstances where tidal waves cause loss of function to all the facilities receiving alternating-currentpower, all the reactor cooling facilities utilizing seawater and all the facilities for spent fuel pool cooling (“Station Blackout”).
(1) Allocate staff in order to maintain reactor facilities under Station Blackout.
(2) Train staff who operate to maintain reactor facilities under Station Blackout.
(3) Install power source cars, fire-fighting vehicles, fire fighting hoses and other equipments necessary for operation to maintain reactor facilities under Station Blackout.
2. The organization shall conduct activities to maintain reactor facilities under Station Blackout based on the plans mentioned above.
3. The organization shall conduct periodic evaluation on the matters mentioned in Paragraph 1. and 2. and based on such evaluation, take necessary measures.

Now, we shall be looking the start of improvement works in a pair of months in NPS around the world; that, if the nuclear industry really wants to survive this disaster.

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