The report defines spent and disused SRS, identifies and analyses the possible causes of
accidents with such SRS and assesses the potential risks involved. The report, in particular,highlights the periods of highest risk in the lifetime of the SRS. It outlines the responsibilities associated with spent/disused SRS on the national, regulatory and waste management levels. The report, however, does not cover SRS exempted from Regulatory Control, unsealed radioactive material or radiation generators.