Method for processing resonance pseudo-nuclide under resonance interference effect

A technology of resonance nuclide and resonance interference, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve the problems of high precision, numerical instability, singular value in cross-section, etc., and achieve high precision and high numerical stability. sexual effect

Active Publication Date: 2017-08-25
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the resonance interference factor is generally calculated in an infinite uniform system. Due to the inconsistency of the energy spectrum between the infinite uniform system and the non-uniform system, the resonance interference factor cannot completely correct the influence of the resonance interference effect.
For high-enrichment problems or cross-sections of fuel rod inner rings, the resonance interference factor method cannot achieve high accuracy
And because of the reverse interpolation process of the resonance interference factor on the background section, numerical instability will occur, resulting in singular values ​​in the section

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  • Method for processing resonance pseudo-nuclide under resonance interference effect
  • Method for processing resonance pseudo-nuclide under resonance interference effect
  • Method for processing resonance pseudo-nuclide under resonance interference effect

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0031] The invention considers the resonance interference effect by making the resonance section table of the resonance pseudonuclide online. The specific calculation process of this method includes the following aspects:

[0032] 1) According to the nucleon density and volume of each resonance zone of the MOX fuel rod, calculate the average nucleon density of the fuel rod according to the formula (1); select at least 20 dilution cross-section points, for the PWR, since the most important resonant nuclide is 238 U, its equivalent dilution cross-section is between 20barn and 50barn, so in this interval should select relatively dense background cross-section points, the recommended background cross-section points are 23, respectively: 5, 10, 15, 20, 25, 28, 30, 35, 40, 45, 50, 52, 60, 70, 80, 100, 200, 400, 600, 1000, 1200, 1E4, 1E10 are in barn;...

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Abstract

The invention discloses a method for processing resonance pseudo-nuclide under a resonance interference effect. The method comprises the following steps that: 1: according to the nuclear density of resonance nuclide, manufacturing a resonance section table of the resonance pseudo-nuclide; 2: fitting by a Pade approximation method to obtain the subgroup parameters of the resonance pseudo-nuclide and sub-resonance nuclide; and 3: solving a subgroup stationary source equation to obtain subgroup flux, and utilizing the subgroup flux to merge the subgroup sections of the sub-resonance nuclide to obtain an effective self-shielding section. In the method, the resonance section table of the resonance pseudo-nuclide is manufactured to consider the resonance interference effect, and the method has higher accuracy and numerical stability than a traditional method.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor core design and safety, in particular to a resonance pseudonuclide method for dealing with resonance interference effects. Background technique [0002] Deterministic methods generally use multi-group approximation, so resonance calculations are required to provide effective self-screening sections for subsequent transport calculations. Resonance calculation methods can be divided into three categories: equivalence theory, subgroup method and ultrafine group method. The efficiency of the equivalence theory is high, but the accuracy is low, so it gradually no longer meets the continuously increasing requirements for accuracy. The superfine group method has high precision, but it is not widely used because of the low efficiency due to the use of superfine group division for energy variables. The subgroup method divides subgroups according to the size of the section, which is a method to ac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 祖铁军贺清明曹良志刘宙宇
Owner XI AN JIAOTONG UNIV
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