Probabilistic Fracture Mechanics Application for Alloy 82/182 Welds in PWRS

• DOI: 10.1115/pvp2010-25176
• Publication Date: 2011-01-14T19:33:09Z
• Authors: Jong-Dae Hong; Changheui Jang
• Keywords: Pressurized water reactor; Corrosion Fatigue

In operating PWRs (Pressurized Water Reactors), incidents of Alloy 82/182 cracking increased the concern for structural integrity butt weld locations recently, because high residual stresses. Studies on PWSCC (Primary Stress Corrosion Cracking) have been mainly performed using deterministic approaches by controlling parameters, but a quantitative evaluation is difficult large uncertainties in each parameter and test results. The purposes this paper are to provide probabilistic fracture mechanics (PFM) analysis methodology quantify failure probabilities welds primary piping systems nuclear power plants. To calculate probabilities, Monte Carlo simulation technique was used. estimate time crack initiation, material susceptibility quantified considering effects various processing, grain boundary carbide coverage, water chemistry including zinc addition, so on. growth analysis, orientation dissolved hydrogen concentration were considered. And repair evaluated.