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Analytical Structural Integrity for Welding Part at Piping Penetration under Seismic Loads
Hun-Oh Choi(최헌오),Hoon-Hyung Jung(정훈형),Chae-sil Kim(김재실) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
The purpose of this paper is to assess the structural integrity of piping penetrations for nuclear power plants. A piping qualification analysis describes loads due to deadweight, pressure difference acts normal to the plate, thermal transients, and earthquakes, among other events, on piping penetrations that have been modeled as an anchor. Amodel was analyzed using a commercial finite element program. Apiping penetration analysis model was constructed with an assembly of pipe, head fittings and sleeves. Normally, the design load, thus obtained, will consist of three moments and three forces, referred to a Cartesian coordinate system. When comparing the stress analysis results from each required cutting position, the general membrane stress intensities and local membrane plus bending stress intensities during a structural evaluation cannot exceedthe allowable amount of stress for the design loads. Therefore, the piping penetration design satisfies the code requirements.