Effect of out-of-plane denting loads on the structural integrity of steam generator internals. Final report. [PWR]
This report presents the results of a structural analysis of steam generator tubes, tube support plates and tubesheet when tube denting has caused tubes to lock into support plates. A section of a support plate with associated tubes was modeled by finite element techniques to determine the maximum axial load in the tubes imposed by differential thermal expansion. The tube structural integrity was addressed from the standpoint of flow induced vibrations and fatigue for the imposed axial loading. The maximum stress in the perforated plate due to locked tubes was determined by finite element methods. The axial loads in the tubes were applied to a tubesheet finite element model to determine the primary bending stresses. Axial loads in the tubes were applied as a concentrated load through the tubesheet thickness to determine maximum shear. The stresses from these analyses were compared to the ASME Code Section III allowables and were found to be acceptable.
- Research Organization:
- Combustion Engineering, Inc., Chattanooga, TN (USA)
- OSTI ID:
- 5082625
- Report Number(s):
- EPRI-NP-1479; TRN: 80-016702
- Country of Publication:
- United States
- Language:
- English
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