Abstract
This study was performed to assess the validity of the R6-Rev. 3 approach to predict fracture behavior of carbon steel pipes for LWR plants. To verify the approach, a maximum load, predicted by analysis, was compared with an experimental load, obtained at JAERI. Analysis and experimentation were conducted on a STS 42 pipe (6B, sch. 80) with a circumferential through-wall crack (2θ=180°). The comparison of the results indicates that the R6-Rev. 3 approach gives conservative maximum load prediction with reasonable accuracy. In the next step, failure assessment curve (FAC) was discussed briefly, and sensitivity analysis was carried out to clarify the effects of initial crack length, pipe size, and toughness of the material on fracture load and the possibility of occurrence of net-section collapse. Although unstable fracture was predicted to occur by a mode other than net-section collapse in all analyses, fracture load was able to be evaluated by simple limit load analysis based on yield stress, so long as a proper margin was considered.
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