Implicit finite element structural dynamic formulation for long-duration accidents in reactor piping systems
This taper describes an implicit three-dimensional finite-element formulation for the structural analysis of reactor piping system. The numerical algorithm considers hoop, flexural, axial, and torsion modes of the piping structures. It is unconditionally stable and can be used for calculation of piping response under static or long duration dynamic loads. The method uses a predictor-corrector, successive iterative scheme which satisfies the equilibrium equations. A set of stiffness equations representing the discretized equations of motion are derived to predict the displacement increments. The calculated displacement increments are then used to correct the element nodal forces. The algorithm is fairly general, and is capable of treating large displacements and elastic-plastic materials with thermal and strain-rate effects. 7 refs., 7 figs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5581131
- Report Number(s):
- CONF-850809-7; ON: DE85006842
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210500* -- Power Reactors
Breeding
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900 -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
BREEDER REACTORS
COMPUTERIZED SIMULATION
CREEP
DYNAMIC LOADS
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FINITE ELEMENT METHOD
FLUID MECHANICS
FUNCTIONS
HYDRODYNAMICS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
NUMERICAL SOLUTION
PIPES
PRESSURIZING
REACTOR ACCIDENTS
REACTOR CORE DISRUPTION
REACTOR SAFETY
REACTORS
RESPONSE FUNCTIONS
SAFETY
SIMULATION
STEAM LINES
STRESSES
TEMPERATURE EFFECTS
THREE-DIMENSIONAL CALCULATIONS
TRANSIENTS