AW: [ RadSafe ] The world's first permanent disposal sitefor usednuclear fuel will be at Forsmark, Sweden's SKB announcedtoday.

[Franta, Jaroslav]

UNRESTRICTED | ILLIMITÉ

<snip>the longer sits before you reprocess, the easier the reprocessing can be. <end>

.....OTOH, much of the valuable Pu241 (fissile fuel) in SNF decays to useless Am241 (non-fissile TRU waste).

Jaro
^^^^^^^^^^^^^^^^^^^^

 

If you REALLY want non-retrievable, drop it into a deep ocean subduction zone.  Then wait a couple of eons.  

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf Of George Stanford
Sent: Thursday, June 04, 2009 4:46 PM
To: radsafe at radlab.nl
Subject: Re: AW: [ RadSafe ] The world's first permanent disposal sitefor used nuclear fuel will be at Forsmark, Sweden's SKB announcedtoday.

Franz & All:

      Thanks to Bjorn Cederval for the additional info.  At one of the sites
(<http://www.thelocal.se/19824>)
there is this:

>"The Swedish technique consists of storing two tonnes of spent fuel in 
>copper-coated canisters that weigh 25 tonnes each.
>
>"Each canister is welded shut using a special technique and then 
>mechanically deposited in a tunnel in the repository.
>
>"A buffer of bentonite clay, a volcanic ash that when mixed with water 
>swells to provide a watertight barrier and protect against earthquakes, 
>is then injected to fill the hole in the rock.
>
>"'The canisters are buried several metres apart so he rock can absorb 
>the heat generated by the radioactive materials in each copper 
>canister.'
>Engholm explains.
>
>"Once a tunnel in the repository is full, the tunnel is filled in with 
>a mixture of bentonite and rock."

      It does not appear that ease of retrievability is one of the design requirements.

         -- George

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