Currently, we do not have any long-term disposal sites for nuclear waste. Instead, we have been storing the waste so that they become less radioactive over time. One common practice is to store the waste products of fission reactions as vitrified glass after it has been reprocessed and the uranium and plutonium are removed to be recycled. The vitrified products are encapsulated in “a corrosion-resistant metal jacket (often double-walled)” and placed in a deep underground repository. The repository is chosen based on geology that has been proven to be stable for “tens of millions of years and appears likely to remain stable for at least 10,000 years more” (Zebroski 2002).
It sounds like we’ve had to deal with nuclear waste in this way since the 1980s, according to this page (pdf file).
Zebroski, Edwin L. “Nuclear Fuel Cycle.” McGraw-Hill Encyclopedia of Science & Technology. 9th ed. 20 vols. USA: The McGraw-Hill Companies, Inc., 2002.
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