Sweden’s Radiation Safety Authority (SSM) has ordered seven companies including the country’s three nuclear power stations to dispose of radioactive waste that may have been improperly disposed of.

SSM said in a statement that the waste comes from nuclear facilities and other activities and was placed in the final repository for short-lived low- and intermediate-level radioactive waste, known as the SFR, at Forsmark in Östhammar municipality, north of Stockholm, from the 1980s until 2001.

SSM said 75 containers containing 2,844 barrels are likely to contain low- and medium-level radioactive waste that has been stored incorrectly.