An assessment is made of the radioactive contamination of Danish territory in the event of a core-melt accident at the Barseback nuclear power plant in Sweden. Accidents including both core melt-down and containment failure are considered. Consequences are calculated for a BWR-3 release under common meteorological conditions and for a BWR-2 release under extreme meteorological conditions. Calculations are based on experiments and theoretical work relating to deposition velocities for different types of surface, shielding effect of structures, and weathering. The effects are described of different dose-reducing measures, e.g., decontamination, relocation, destruction of contaminated foodstuffs. The collective effective dose equivalent from external gamma radiation from deposited activity integrated over a time period of 30 years, is calculated to be 3.6 Megamanrem (continue on next page) March 1982 Ris0 National Laboratory, DK-4000 Roskilde, Denmark in the BWR-3 case without dose-reducing measures. For the BWR-2 case, the corresponding dose is approx. 41 Megamanrem. A combination of temporary relocation, hosing of roads etc. and digging of gardens is estimated to reduce these doses to approx. 2.5 Megamanrem and approx. 15 Megamanremf respectively. The collective committed effective dose equivalent from the consumption of contaminated foodstuffs is calculated to 23 Megamanrem in the BWR-3 case without dose-reducing measures. This dose could be reduced to 0.2 Megamanrem if contaminated crops are destroyed during the first year after the accident and if changes are made in agricultural production in the contaminated area. The corresponding doses in the BWR-2 case would be 197 Megamanrem and 1.4 Megamanrem, respectively. INIS descriptors; MELTDOWN, METEOROLOGY, EXTERNAL RADIATION, GAMMA RADIATION, RADIATION DOSES, FALLOUT DEPOSITS, SURFACE CONTAMINATION, BUILDINGS, SHIELDING, WEATHER, FOOD CHAINS UDC 519.283 : 614.73 : 614.876 : 621.039.58 ISBN 87-550-0831-3 ISSN 0106-2840