The effect of the environment on fatigue design has been the subject of intense study in USA, Japan and elsewhere. Several reports indicate a potentially large influence of the environment, leading to the proposal of entirely new analysis procedures. SSM has in an earlier project sponsored research to evaluate the technical basis for these proposals, see SSM Research Report 2011:04. In the current report, the consequences for a Swedish BWR piping system are evaluated using the new analysis procedure including environmental effects on fatigue.
The principal objective of the project has been to find out the consequences for a Swedish BWR piping system using the new analysis procedure to include environmental effects on fatigue. Another objective has been to find out how well the commercial code Pipestress can handle environmental effects on fatigue.