 SI has performed a number of sophisticated piping analyses to solve special design and operational problems. Examples of these analyses include thermal stratification in PWR piping attached to the reactor coolant loop; auxiliary pressurizer spray system initiation and termination transients; piping vibration related to rotating equipment, flow induced effects, acoustic / vortex shedding, socket welds, and power uprate changes; seismic analysis and snubber reduction using alternative criteria; fatigue monitoring algorithms; refined analysis of piping components using NB-3200 methods; and ASME Class 1 piping analysis using a variety of Code Editions and Code Cases.
SI has extensive piping analysis capabilities. SI uses the PIPESTRESS program to perform ASME Class 1, 2, and 3 and B31.1 piping analysis, as well as a variety of programs developed in-house to do specialized calculations. SI also has programs that translate input files from programs such as ME101, SUPERPIPE, and ADLPIPE. The finite element program ANSYS is used to perform NB-3200 analysis. AUTOPIPE is used in determining hydraulic forcing functions for pressure wave transients.
SI personnel have many years of experience in piping analysis, including those as staff engineers at operating power plants and at NSSS suppliers. SI engineers are active in the ASME Code committees, including the Section III Working Group on Piping, Subgroup Fatigue Strength, Subgroup Design Analysis, and the Section XI Working Group on Flaw Evaluation and Appendix L. SI has also done a considerable amount of research and analysis work for EPRI and the PWR Materials Reliability Program, and has made key contributions to many ASME Code Cases.
Related Technical Literature·
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Operating Experience Regarding Thermal Fatigue of Unisolable Piping