AW: [ RadSafe ] The world's first permanent disposal sitefor usednuclear fuel will be at Forsmark, Sweden's SKB announcedtoday.
frantaj at aecl.ca
Fri Jun 5 14:38:28 CDT 2009
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).
If you REALLY want non-retrievable, drop it into a deep ocean subduction zone. Then wait a couple of eons.
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
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
>"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.
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