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Spectrum calculation method of neutron noise in reactors based on finite element theory

A calculation method and noise spectrum technology, applied in calculation, special data processing applications, electrical digital data processing, etc., can solve problems such as poor geometrical adaptability, and achieve significant progress

Active Publication Date: 2017-09-15
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing reactor neutron noise spectrum calculation method is only effective for regular and simple geometries, but cannot perform numerical solutions for reactor neutron noise based on complex cores, and has poor geometric adaptability

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  • Spectrum calculation method of neutron noise in reactors based on finite element theory
  • Spectrum calculation method of neutron noise in reactors based on finite element theory
  • Spectrum calculation method of neutron noise in reactors based on finite element theory

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Embodiment Construction

[0024] A calculation method of reactor neutron noise spectrum based on finite element theory, comprising the following steps:

[0025] (1) Based on the finite element theory, the geometric processing of the nuclear reactor core is performed. Using the general practice of commercial finite element software, for two-dimensional geometry, triangular mesh or quadrilateral mesh, for three-dimensional geometry, tetrahedral mesh or hexahedral mesh.

[0026] (2) Establish a nuclear reactor neutron noise description equation based on finite element theory. For two-dimensional geometry, a two-dimensional nuclear reactor neutron noise finite element equation is established. For three-dimensional geometry, a three-dimensional nuclear reactor neutron noise finite element equation is established.

[0027] (3) The frequency point to be solved is given.

[0028] (4) Based on the frequency points given in step (3), the description equation established in step (2) is node-discreteized on the s...

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Abstract

The invention discloses a spectrum calculation method of neutron noise in reactors based on the finite element theory. The method comprises following steps: performing geometrical processing on a processed nuclear reactor core based on the finite element theory; building a description equation of neutron noise in reactors based on the finite element theory; based on given frequency points, performing node scattering on the equation of neutron noise in reactors on a spatial grid and establishing a discrete node equation; establishing an overall equation according to a coefficient matrix and an equation source term of the discrete node equation assembly overall equation established in the third step; performing numerical calculation to obtain spatial distribution of neutron noise in reactors under given frequency points. Compared with the prior art, the positive effect of the invention is to realize the accurate calculation of the neutron noise spectrum of the reactor under complex geometries and to provide input conditions for reactor operation monitoring and troubleshooting and the method has significant implications for the progress of construction and safe operation of the reactor expert systems.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor monitoring and fault diagnosis, and in particular relates to a reactor neutron noise spectrum calculation method based on finite element theory. Background technique [0002] Reactor core under different normal operating conditions (such as low power, medium power, high power, single / double pump start, single / double pump stop) and abnormal accident conditions (such as partial core boiling, flow-induced vibration, The neutron noise spectrum of the sudden increase / steep drop of the coolant flow rate is different. Therefore, the calculation of the neutron noise spectrum of the reactor can realize monitoring with the reactor operation, early warning, timely detection and prevention of accident expansion and further deterioration. Since the Three Mile Island nuclear power plant incident, the United States has proposed that a safety monitoring mode must be set up on the power reactor, which incl...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 袁宝新曾和荣杨万奎刘耀光
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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