Denmark is working towards the implementation of a repository for nuclear and radioactive waste by 2073 at the latest. Until then, radioactive waste will be stored at Danish Decommissioning's facilities on the Risø locality on Zealand. Risø hosted Denmark's national laboratory of nuclear energy from 1957 until 2003 when it was decided to commence decommission of the nuclear facilities, including three research reactors and a hot cell unit.
In 2018, Danish Parliament adopted a resolution which outlined policy goals and activities of the Danish national programme to meet the need for a responsible and safe handling of nuclear and radioactive waste in accordance with Denmark's international obligations.
You can find further background information here: