scholarly journals STRESS ANALYSIS OF LOFT STEAM GENERATOR BLOWDOWN CROSS-OVER LINE

1978 ◽  
Author(s):  
J. N. Singh
Keyword(s):  
Stress Analysis ◽  
Steam Generator

ASME Section III Stress Analysis of a Heat Exchanger Tubesheet With a Misdrilled Hole and Irregular or Thin Ligaments

2013 ◽  
Author(s):  
Enrique Gomez ◽  
Roberto Ruiz ◽  
Robert M. (Con) Wilson
Keyword(s):  
Heat Exchanger ◽  
Stress Analysis ◽  
Steam Generator ◽  
Companion Paper ◽  
Flat Plates

A stress analysis is described for a nuclear steam generator tubesheet with a thin or irregular ligament associated with a mis-drilled hole using the rules of ASME B&PV Section III and Non-Mandatory Appendix A, Article A-8000 for Stresses in Perforated Flat Plates. The analysis demonstrates the proper application of the NB-3200 rules for this special application with discussion of the differences between an actual tube hole deviation from what is assumed in ASME Appendix A. This is a companion paper to “Technical Justification Supporting Operation with a Tube Installed in a Mis-Drilled Hole of a Steam Generator Tubesheet”.

PWSCC Assessment of Dissimilar Weld on Steam Generator Drain Nozzle in PWR

2009 ◽  
Author(s):  
Jong-Sung Kim ◽  
Seong-Sik Hwang ◽  
Hong-Pyo Kim
Keyword(s):  
Stress Analysis ◽  
Steam Generator ◽  
Stress Distributions ◽  
Dissimilar Weld ◽  
Dissimilar Welds ◽  
Primary Water ◽  
Operating Stress ◽  
Growth Assessment ◽  
Penetration Time ◽  
Good Agreement

Recently, it is reported that axial and circumferential PWSCCs (primary water stress corrosion crackings) occurred on the dissimilar welds of steam generator drain nozzles in PWR. In this study, the PWSCC is assessed via residual stress analysis, PWSCC initiation review and growth assessment. The residual and operating stress distributions are calculated by finite element method. Based on the stress analysis results, PWSCC initiation locations are predicted by comparing between the stresses and PWSCC threshold stress value. The predicted locations are compared with the examination results by using penetration, eddy current and destructive tests. It is found that the PWSCC initiation prediction has good agreement with the examination results. Also, PWSCC growth is assessed by using the PWSCC growth analysis procedure presented in ASME B&PV Code, Sec.XI. Finally, it is identified that the penetration time via growth assessment has reasonable agreement with the real one.

Technical Justification Supporting Operation With a Tube Installed in a Mis-Drilled Hole of a Steam Generator Tubesheet

2013 ◽  
Author(s):  
Roberto Ruiz ◽  
Enrique Gomez ◽  
Robert M. (Con) Wilson
Keyword(s):  
Heat Exchanger ◽  
Stress Analysis ◽  
Steam Generator ◽  
Companion Paper ◽  
Potential Interaction ◽  
Manufacturing Processes ◽  
Tube Expansion

An evaluation is described for a tube with manufacturing induced bending, resulting from installation in a tubesheet mis-drilled hole. Considerations include manufacturing processes such as tube installation and tube expansion plus evaluations of the resulting tube stresses using ASME B&PV Code Section III rules. Also considered are operating issues such as potential interaction with neighboring tubes, tube vibration and wear, and the potential for accelerated tube corrosion. This is a companion paper to “ASME Section III Stress Analysis of a Heat Exchanger Tubesheet with a Misdrilled Hole and Irregular or Thin Ligaments”.

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