Browsing by Author "Li, ChaoJen"

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DYNAMIC ANALYSIS OF INCLUDING NEW LOADS ON SPENT FUEL STORAGE RACK
(2011)
Tsai, YaoLong
;
Tsai, TaiPing
;
Li, ChaoJen
;
Wang, Li-Hua
;
Fan, TeWei
The safety evaluation of spent fuel storage rack is performed for many power companies on the seismic loading previously. However, due to the inclusion of new loads, .i.e., Safety/Relief Valve Actuation (SRV) and Loss-of-Coolant Accident (LOCA), the reevaluation is required according to the regulations of NRC and AEC. Instead of simplifying one rack as one beam with many degrees of freedom, all racks in the pool are discretized by the shell elements in ANSYS. In addition, hydrodynamic mass model between racks and between fuel and rack are included.
SENSITIVITY ANALYSES OF FINITE ELEMENT METHOD FOR COMPUTING RESIDUAL STRESS OF DISSIMILAR METAL MULTI-PASS WELD
(2011)
Tsai, YaoLong
;
Li, ChaoJen
;
Tsai, TaiPing
;
Wang, Li-Hua
;
Fan, TeWei
Recently the stress corrosion cracking cases of dissimilar metal welds are found in many nuclear power plants. Weld-induced residual stress is main factor for crack growth. Therefore exact estimation of residual stress is important for reliable operation. This paper presents residual stress computation performed by EU mock-up Nozzle. Based on ANSYS software, uncoupled thermal-mechanical three-dimensional (3D) and two-dimensional ax symmetric finite element models are developed. Based on 2 dimensional and 3 dimensional finite element analyses, effect of the welding sequence approaches for multi-pass weld such as lump, layer and ring etc. on residual stress variation is estimated for sensitivity analysis.