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http://dx.doi.org/10.3795/KSME-A.2012.36.10.1115

Sensitivity Analysis of Finite Element Parameters for Estimating Residual Stress of J-Groove Weld in RPV CRDM Penetration Nozzle  

Bae, Hong-Yeol (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Ju-Hee (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Yun-Jae (Dept. of Mechanical Engineering, Korea Univ.)
Oh, Chang-Young (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Ji-Soo (Dept. of Mechanical Engineering, Korea Univ.)
Lee, Sung-Ho (Central Research Institute, Korea Hydro and Nuclear Power Co. Ltd.)
Lee, Kyoung-Soo (Central Research Institute, Korea Hydro and Nuclear Power Co. Ltd.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.10, 2012 , pp. 1115-1130 More about this Journal
Abstract
In nuclear power plants, the reactor pressure vessel (RPV) upper head control rod drive mechanism (CRDM) penetration nozzles are fabricated using J-groove weld geometry. Recently, the incidences of cracking in Alloy 600 CRDM nozzles and their associated welds have increased significantly. The cracking mechanism has been attributed to primary water stress corrosion cracking (PWSCC), and it has been shown to be driven by welding residual stresses and operational stresses in the weld region. The weld-induced residual stress is the main factor contributing to crack growth. Therefore, an exact estimation of the residual stress is important for ensuring reliable operation. This study presents the residual stress computation performed for an RPV CRDM penetration nozzle in Korea. Based on two and three dimensional finite element analyses, the effect of welding variables on the residual stress variation is estimated for sensitivity analysis.
Keywords
FEA; RPV; CRDM; PWSCC; BMI; J-groove weld; Sensitivity Analysis;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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