[en] Over its thirteenth year of operation, the power station again achieved very good performance data, despite some power setbacks on request of the load dispatcher, or for the purpose of in-service inspections. The total gross output in 1997 was 12 528 660 MWH, the net electricity supplied to the public grid was 11 864 655 MWh. The station''s own electricity demand amounted to 5.3%, and the average net efficiency was 35.3%. The overview of further performance data of the year 1997 shows: Availability time ratio, 100%; (net) availability factor, 99.3%; load factor, 99.6%. Aggregated gross electricity output since first start-up of the power station on 31 August 19984 (1. criticality) amounts to 144 823 403 MWh, and net output to 137 050 909 MWh. Radioactivity levels in the gaseous or liquid effluents again were low in the reporting year and as in the preceeding year were far from the legal maximum permissible levels. The radioactivity in gaseous effluents was analysed to consist of: noble gases, 2.38 E+11Bq; aerosols, 1.23 E+06Bq; iodine, ≤ lowest detectable limit. Radioactivity released with liquid effluents in the reporting year was 4.16 E+07 Bq (tritium not included), and 7.39 E+12 Bq from tritium. The collective radiation dose received by internal personnel in 1997 (measured with direct-readout dosemeters) was 59.578 mSv, and 77.86 mSV was the dose received by external personnel. (orig./CB)