Residual stresses (RSs) in welded structures are inevitable and it is vital that they are considered and quantitatively estimated when analysing cracking and fracture problems such as those emanating form conventional and nuclear power facilities. In this research proposal we would concentrate on providing high quality measurements data of residual stress in complexes similar and dissimilar welds in piping components for CANDU industry. There are three main objectives of the present proposal: (1) to determine the RS in the bended pipe and proto-typical dissimilar metal feeder welds in the as-welded condition and after successful repair; (2) cross correlation of the ND results with other non-destructive diffraction technique; finally, (3) the results will be compared with the current assessment procedures.