The U.S. Nuclear Regulatory Commission (NRC) has undertaken a program to assess the integrity of control rod drive mechanism (CRDM) nozzles in existing plants that are not immediately replacing their RPV heads. This two-part paper summarizes some of the efforts undertaken on the behalf of the U.S.NRC for the development of detailed residual stress and circumferential crack-driving force solutions to be used in probabilistic determinations of the time from detectable leakage to failure. In this first paper, the finite element (FE) simulations were conducted to investigate the effects of weld geometry on the residual stresses in the J-weld for a centerhole CRDM nozzle. The variables of weld geometry included three weld heights (weld sizes) and three groove angles for each weld height while keeping the same weld size. The analysis results indicate that the overall weld residual stress decreases as the groove angle increases and higher residual stress magnitude is associated with certain weld height. The results also reveal that the axial residual stresses in the Alloy 600 tube are very sensitive to the weld height, and that the tube hoop stresses above the J-weld root increase with the increasing weld height.
Skip Nav Destination
ASME 2005 Pressure Vessels and Piping Conference
July 17–21, 2005
Denver, Colorado, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4191-X
PROCEEDINGS PAPER
Effects of Weld Geometry on Residual Stress and Crack Driving Force for Centerhole Control Rod Drive Mechanism Nozzles: Part I — Weld Residual Stress
Wentao Cheng,
Wentao Cheng
Engineering Mechanics Corporation of Columbus, Columbus, OH
Search for other works by this author on:
David L. Rudland,
David L. Rudland
Engineering Mechanics Corporation of Columbus, Columbus, OH
Search for other works by this author on:
Gery Wilkowski,
Gery Wilkowski
Engineering Mechanics Corporation of Columbus, Columbus, OH
Search for other works by this author on:
Wallace Norris
Wallace Norris
U.S. Nuclear Regulatory Commission, Rockville, MD
Search for other works by this author on:
Wentao Cheng
Engineering Mechanics Corporation of Columbus, Columbus, OH
David L. Rudland
Engineering Mechanics Corporation of Columbus, Columbus, OH
Gery Wilkowski
Engineering Mechanics Corporation of Columbus, Columbus, OH
Wallace Norris
U.S. Nuclear Regulatory Commission, Rockville, MD
Paper No:
PVP2005-71077, pp. 11-16; 6 pages
Published Online:
July 29, 2008
Citation
Cheng, W, Rudland, DL, Wilkowski, G, & Norris, W. "Effects of Weld Geometry on Residual Stress and Crack Driving Force for Centerhole Control Rod Drive Mechanism Nozzles: Part I — Weld Residual Stress." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication. Denver, Colorado, USA. July 17–21, 2005. pp. 11-16. ASME. https://doi.org/10.1115/PVP2005-71077
Download citation file:
19
Views
Related Proceedings Papers
Related Articles
Stress Concentration, Stress Intensity, and Fatigue Lifetime Calculations in Autofrettaged Tubes Containing Axial Perforations Within the Wall
J. Pressure Vessel Technol (November,1997)
Weld Residual Stress in Various Large Diameter Nuclear Nozzles
J. Pressure Vessel Technol (December,2012)
Analysis of Residual Stresses On the Expanding Transition Zone of Steam Generator Tubes of Apr1400
J. Pressure Vessel Technol (January,0001)
Related Chapters
Use of Large Standoff Magnetometry for Geohazard Pipeline Integrity Investigations
Pipeline Integrity Management Under Geohazard Conditions (PIMG)
In Situ Observations of the Failure Mechanisms of Hydrided Zircaloy-4
Zirconium in the Nuclear Industry: 20th International Symposium
Industrially-Relevant Multiscale Modeling of Hydrogen Assisted Degradation
International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions