This report is the thirty-third in the Agency's series of annual reports on operating experience with nuclear power stations in Member States. It is a direct output from the Agency's Power Reactor Information System (PRIS) and contains data on electricity production, overall plant operating performance and plant outage during 2001 for individual plants. In addition to annual performance data and outage information, the report contains a historical summary of performance and outages during the lifetime of individual plants and figures illustrating worldwide performance and statistical data. The PRIS databank is available free of charge to IAEA Member States through its products PRIS-PC, MicroPRIS und the PRIS page on the Internet http: //www.iaea.or.at/programmes/a2). PRIS-PC allows direct access to the database via the Internet. MicroPRIS contains a subset of the PRIS database.