[ RadSafe ] Icy future for Japan???
hotgreenchile at gmail.com
Wed Sep 4 00:27:50 CDT 2013
Freeze walls are an extremely effective hydrobarrier, are very robust, can
last for decades and have a long history of use in mining and excavating.
Cameco uses a CaCl2 brine (-25 to -35C) to freeze rock around the high
grade McArthur River uranium deposit which is located in a clayey,
relatively incompetent rock called an argillite. Shell Oil successfully
tested freeze wall technology in the Piceance Basin, NW Colorado for it's
potential as a hydrobarrier using anhydrous ammonia (-40 to -50C) as a
refrigerant. Rock, being a good insulator, can remain frozen for decades or
as long as necessary.
The water inside the freeze wall can be pumped & treated and managed
independently of water outside the freeze wall making it ideal for treating
a local source of contaminated water.
Concrete is relatively permeable. A grout curtain around a facility is far
more prone to leaks than a freeze wall. A fracture in a grout curtain will
create a leak; a fracture in a freeze wall will heal itself. A freeze wall,
imho, is far better solution, but then I worked for Shell on the Piceance
basin oil shale project for several years, and have been familiar with the
technology as applied to McArthur River since the 80s.
Dan W McCarn, Geologist
108 Sherwood Blvd
Los Alamos, NM 87544-3425
+1-505-672-2014 (Home – New Mexico)
+1-505-670-8123 (Mobile - New Mexico)
HotGreenChile at gmail.com (Private email) HotGreenChile at gmail dot com
On Tue, Sep 3, 2013 at 11:51 AM, <JPreisig at aol.com> wrote:
> CNN News is reporting that Japan is looking at freezing the ground
> around the Fukushima reactors to keep the radioactivity from reaching the
> Ocean. Is there no concrete in Japan??? Isn't dilution the solution to
> Regards, Joe Preisig
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