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Solar modules deployed in France in 1992 still provide 75.9% of original output power
(www.pv-magazine.com)
This is a most excellent place for technology news and articles.
Also want to point out, most of that is container, not spent fuel. The safety standards are so ridiculously high that they basically guarantee zero risk.
More people (per plant) are exposed to elevated levels of radiation due to coal power, and that's not even including the health risk of all the other shit they release