Recently, several circumferential cracks were found in the control rod drive mechanism (CRDM) nozzles of U.S. nuclear power plants. According to the accident analyses, coolant leaks were caused by primary water stress corrosion cracking (PWSCC). The tensile residual stresses caused by welding, corrosion sensitive materials, and boric acid solution cause PWSCC. Therefore, an exact estimation of the residual stress is important for reliable operation. In this study, finite element simulations were conducted to investigate the effects of the tube geometry (thickness and radius) on the residual stresses in a J-groove weld for different CRDM tube locations. Two different tube locations were considered (center-hole and steepest side hill tube), and the tube radius and thickness variables (ro/t=2, 3, 4) included two different reference values (ro=51.6, t=16.9mm).
|Number of pages||9|
|Journal||Transactions of the Korean Society of Mechanical Engineers, A|
|Publication status||Published - 2013 Mar|
- Sensitivity Analysis
ASJC Scopus subject areas
- Mechanical Engineering