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http://dx.doi.org/10.3795/KSME-A.2013.37.3.387

Sensitivity Analysis of Nozzle Geometry Variables for Estimating Residual Stress in RPV CRDM Penetration Nozzle  

Bae, Hong Yeol (Dept. of Mechanical Engineering, Korea Univ.)
Oh, Chang Young (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Yun Jae (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Kwon Hee (Dept. of Mechanical Engineering, Korea Univ.)
Chae, Soo Won (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Ju Hee (Dept. of Mechanical Engineering, Korea Military Academy)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.37, no.3, 2013 , pp. 387-395 More about this Journal
Abstract
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 ($r_o/t$=2, 3, 4) included two different reference values ($r_o$=51.6, t=16.9mm).
Keywords
FEA; RPV; CRDM; PWSCC; Sensitivity Analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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