Describes the background to the determination of partial safety factors to achieve chosen target reliability levels for structural integrity applications where the modes of failure are fracture and plastic collapse. The position on use of partial safety factors in existing codes is reviewed together with evidence on variability of input data relevant to structural integrity assessments. Calculations have then been carried out leading to recommendations for partial safety factors for use in structural integrity assessments for given target reliabilities and data uncertainties. These calculations have been based on the assumption that failure occurs on the PD6493/BS7910 level failure assessment curve. In the final stage of the project the effects of modelling uncertainties on partial safety factors have been assessed based on experimental results of wide plate tests compared to the standard failure assessment curve.
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