Calculation of relative tube/tube support plate displacements in steam generators under accident condition loads using non-linear dynamic analysis methodologies
- Westinghouse Electric Corp., Madison, PA (United States). Nuclear Service Division
A non-linear analysis has been performed to determine relative motions between tubes and tube support plates (TSP) during a steam line break (SLB) event for steam generators. The SLB event results in blowdown of steam and water out of the steam generator. The fluid blowdown generates pressure drops across the TSPS, resulting in out-of-plane motion. The SLB induced pressure loads are calculated with a computer program that uses a drift-flux modeling of the two-phase flow. In order to determine the relative tube/TSP motions, a nonlinear dynamic time-history analysis is performed using a structural model that considers all of the significant component members relative to the tube support system. The dynamic response of the structure to the pressure loads is calculated using a special purpose computer program. This program links the various substructures at common degrees of freedom into a combined mass and stiffness matrix. The program accounts for structural non-linearities, including potential tube and TSP interaction at any given tube position. The program also accounts for structural damping as part of the dynamic response. Incorporating all of the above effects, the equations of motion are solved to give TSP displacements at the reduced set of DOF. Using the displacement results from the dynamic analysis, plate stresses are then calculated using the detailed component models. Displacements form the dynamic analysis are imposed as boundary conditions at the DOF locations, and the finite element program then solves for the overall distorted geometry. Calculations are also performed to assure that assumptions regarding elastic response of the various structural members and support points are valid.
- OSTI ID:
- 129013
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1339-8; TRN: IM9550%%381
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Natural hazard phenomena and mitigation -- 1995; PVP-Volume 308. DOE facilities programs/design criteria and methods for: Impact, wave, high frequency, and seismic loads; Lin, C.W. [ed.] [Lin (Chi-Wen), Martinez, CA (United States)]; Wang, C.Y [ed.] [Argonne National Lab., IL (United States)]; Chang, S.J. [ed.] [Oak Ridge National Lab., TN (United States)]; Chen, W.W. [ed.] [Westinghouse Hanford Co., Richland, WA (United States)]; Mok, G.C.; Murray, R.C. [eds.] [Lawrence Livermore National Lab., CA (United States)]; PB: 461 p.
- Country of Publication:
- United States
- Language:
- English
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