COWI's forstudierapport maj 2011 side 167:
After 100 years it is assumed that the plastic membrane is no longer water tight.
The scenario of rain water passing through the repository
after 100 years is thus not considered an accidental event.
After 300 years, when the repository is forgotten, the membrane and concrete is
no longer considered to be water tight. Repeated significant
rainfall over many years may cause erosion and thereby reveal the repository and
though less likely also the waste. While the frequency of
this occurring is hardly quantifiable, it will be higher the higher in the ground the
repository is located.
Plastikmembranen er taget på slutdepotet. Under fyldningen, der tager et år, vil det
regne og sne ned, derfor får depotet efter lukning/30 år betegnelsen "vådt depot".
Det er ikke lovende, at depotets sikkerhedshorisont kun er 300 år, når der er en del,
der stråler ud over 1000 år og evigt giftigt affald og bly.