Elastic-Stress Analysis of Small-Radius U-Bend Steam-Generator Tubes. Final Report (PWR)

摘要

Detailed finite-element analyses have been performed to determine the role of elastic stresses in cracking of steam-generator U-bend tubes. These analyses considered the effect of simulated typical operating conditions on tubes with local geometry variations and anomalies. A finite-element model incorporating the geometry of an actual tube was developed and analysis results were compared to those of the idealized tubes. The results of each of these analyses were compared to analysis results for an idealized uniformly circular tube. Specific geometrical factors and loading conditions which affect the stresses were identified and their significance discussed. Finally, stress results were correlated to locations of actual cracking in tubes removed from power plant service. (ERA citation 08:031641)