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Fission source extrapolation method for accelerating Monte Carlo critical calculation

A push method and Monte Carlo technology, applied in the field of reactor engineering, can solve the problems of slow convergence of fission sources, etc., and achieve the effects of improving critical calculation efficiency, good application effects, and accelerating the convergence of fission sources

Active Publication Date: 2021-04-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] Aiming at the problem of slow convergence speed of the fission source in the existing Monte Carlo critical calculation, the present invention proposes a fission source extrapolation method to accelerate the Monte Carlo critical calculation, which can significantly improve the convergence speed of the fission source in the Monte Carlo calculation of the reactor, and can be used as a Monte Carlo method. The acceleration module of the program is adopted by various Monte Carlo programs, which significantly improves the efficiency of Monte Carlo critical calculations

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  • Fission source extrapolation method for accelerating Monte Carlo critical calculation
  • Fission source extrapolation method for accelerating Monte Carlo critical calculation
  • Fission source extrapolation method for accelerating Monte Carlo critical calculation

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Embodiment Construction

[0019] Such as Figure 4 As shown, it is a fission source extrapolation method for accelerated Monte Carlo critical calculation involved in this embodiment, which can significantly accelerate the fission source convergence speed in reactor Monte Carlo calculation, thereby improving the efficiency of critical calculation.

[0020] Step 1: The neutron transport equation needs to be solved in the reactor criticality calculation: Among them: L, C, S and M are leakage term, absorption term, scattering term and fission term respectively, k eff is the effective multiplication factor, ψ is the neutron flux density, and its fission iteration satisfies: Among them: F is an iterative operator, which reflects the global response relationship process of fission reaction, and a series of eigenvalues ​​of F are |k 0 |>|k 1 |>|k 2 |>···.

[0021] Step 2: When performing Monte Carlo critical calculation, first set the initial fission source, the deviation between the initial fission sou...

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Abstract

A fission source extrapolation method for accelerating Monte Carlo critical calculation comprises the steps that an initial fission source is set for Monte Carlo critical calculation, neutron transport simulation can be conducted according to the initial fission source, and spatial distribution of the fission source is counted; then, based on the setting that the fission source gradually converges to a real solution, linear extrapolation is conducted on the fission source, finally, the whole calculation model is divided into a plurality of fission areas, and the number of fission neutrons in each area is adjusted through a source extrapolation factor. According to the method, the fission source convergence rate of reactor Monte Carlo calculation can be remarkably increased, and the method can be used as an acceleration module of Monte Carlo programs, so that the method is adopted by various Monte Carlo programs, and the efficiency of Monte Carlo critical calculation is remarkably improved.

Description

technical field [0001] The invention relates to a technology in the field of reactor engineering, in particular to a fission source extrapolation method for accelerating the calculation of the Monte-Cardian criticality, which effectively improves the efficiency of the calculation of the Monte-Carnarian criticality. Background technique [0002] The Monte-Callinian critical calculation faces the problem of slow convergence of fission sources, which seriously wastes computing resources. In order to improve the efficiency of Monte Carlo critical calculation, it is necessary to study the method of accelerating the convergence of fission source. Linear extrapolation technology is a common acceleration method in the field of mathematics, but it has not been applied to the Monte Carlo method yet. Contents of the invention [0003] Aiming at the problem of slow convergence speed of the fission source in the existing Monte Carlo critical calculation, the present invention proposes...

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Application Information

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IPC IPC(8): G06F30/20G06F111/08
Inventor 潘清泉孙启政张滕飞刘晓晶
Owner SHANGHAI JIAO TONG UNIV
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