Finite element analysis method for spent nuclear fuel storage grid seismic safety

Abstract

The invention provides a finite element analysis method for spent nuclear fuel storage grid seismic safety. The method comprises the following steps that: according to the maximum value and the minimum value of a friction coefficient between a pool bottom plate and grid supporting feet, determining a finite element analysis object; independently establishing and calculating the finite element model for the finite element analysis object, wherein the step of establishing and calculating finite element model comprises the following steps that: determining a finite element analysis method; simplifying the structure of the finite element analysis object; selecting a finite element unit used for modeling, and carrying out mesh generation on the finite element unit; selecting the physical property parameter of the finite element model; determining a finite element model boundary condition; and calculating the finite element model to obtain a finite element model calculation result. According to the finite element analysis method, under a condition that the grid of the same structure is assumed and the same seismic load is stipulated, load, stress and strain borne by the grid can be analyzed so as to check whether grid strength, deformation and displacement can meet safety requirements during earthquakes according to an analysis result.

Description

technical field [0001] The invention relates to the field of nuclear power plant design, and more specifically relates to a finite element analysis method for seismic safety of spent nuclear fuel storage grids. Background technique [0002] The spent nuclear fuel storage grid is the core equipment in the nuclear fuel cycle, and is widely used in spent fuel storage in the reactor, intermediate off-reactor storage and reprocessing plant storage. With the rapid development of my country's nuclear power industry, the market demand for spent nuclear fuel storage racks is huge. [0003] In the existing grid design, the strength analysis of the grid structure in the design working condition, abnormal working condition and design working condition is used as the design basis, and the collision analysis between the grid and the grid in the earthquake safety analysis is not involved , Collision analysis between the grid and the storage pool wall, structural stiffness analysis of the ...

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Problems solved by technology

[0003] In the existing grid design, the strength analysis of the grid structure in the design working condition, abnormal working condition and design working condition is used as the design basis, and the collision analysis between the grid and the grid in the earthquake safety analysis is not involved , Collision analysis between the grid and the storage pool wall, structural stiffness analysis of the grid, etc.

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