Seismic Analysis of UGS in SMART-P Considering the Contained Water Effect
Conference
·
OSTI ID:21160759
- Doosan Heavy Industries and Construction Co. LTD, Reactor Design Team, 555 Guygok-Dong Chang Won (Korea, Republic of)
The upper guide structure(UGS) in SMART-P composed of CEA's grouping and guide plates and sliding tubes provides a flow path from the support cylindrical shell to the outer annular region of the pressurizer in SMART-P. In general, the solutions applicable on the structural vibrations have been only for those in air since the structural vibrations in fluid were coupled to the motion of the surrounding fluid. Therefore, the natural frequencies of structures in fluid must be found from the coupled fluid-structural analysis. In this paper, 1/2 symmetric finite element model is developed using I-DEAS to evaluate the effect of seismic load applying at this structure. To present the surrounding fluid effects on the analysis of the natural frequencies and mode shapes of UGS, added masses were calculated using mathematical equations which were described as the movement characteristics of sliding tubes, guide plate, support cylindrical shell in fluid. All of those were reflected in the finite element model. And also the perforated plates, CEA guide plate and core support plate, is replaced by solid plate which is geometrically similar to the perforated plate but has modified values of the elastic constants. Modal analyses were performed using the newly developed 3D finite element model to figure out the natural frequencies and mode shapes of the UGS. For the seismic load analysis, the seismic spectrum accelerations that could produce the maximum stress intensity at the critical region of the UGS were applied at the flange and the integrity of the UGS was evaluated with these analysis results. Furthermore these results also will be used for the optimal design of the UGS. (authors)
- Research Organization:
- American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 21160759
- Country of Publication:
- United States
- Language:
- English
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