[en] The purpose of this paper is to discuss the different stress analysis methods applied at various stages during design work on a complicated nozzle for a BWR-vessel, and to compare these methods which each other and with experimental results obtained from measurements on the vessel during proof testing. Conclusions are presented regarding the general approach applied and the validity of the different methods. These conclusions will be valid for components possessing some similarity with the present structure. The component dealt with is the nozzle for the main circulation pumps in the pressure vessel of the ASEA-ATOM BWR. (Auth.)