Method for evaluating keff uncertainty caused by nuclear cross section

A certainty, cross-section technology, applied in special data processing applications, complex mathematical operations, design optimization/simulation, etc., can solve problems such as deviation of calculation results and deviation of nuclear cross-section evaluation results.

Pending Publication Date: 2022-01-04
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology

Due to the fact that the nuclear cross-section will produce a certain deviation in the process of measurement, and according to its measurement principle and method, there will be a certain correlation between the deviation between different energy groups, different cross-sections and even d...

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  • Method for evaluating keff uncertainty caused by nuclear cross section
  • Method for evaluating keff uncertainty caused by nuclear cross section
  • Method for evaluating keff uncertainty caused by nuclear cross section

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Embodiment Construction

[0033] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0034] figure 1 The flow chart of the method for evaluating the uncertainty of keff caused by the deviation of the nuclear cross section provided in the specific embodiment of the present invention is shown, and the method includes the following steps:

[0035] S1. Select the nuclide that needs to be evaluated in the nuclear system to be analyzed

[0036] Generally, it should include nuclear materials (such as U, Pu, etc.), main structural materials (such as Fe, Cr, Ni, etc.), main moderator materials (such as H, C, etc.), and other main materials. When it is impossible to determine which nuclides are more important, all nuclides can be selected as the analysis objects.

[0037] S2. Select the nuclear cross section that needs to be evaluated for each nuclide

[0038] This core cross section should be unique. If the total inelastic scattering cross...

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Abstract

The invention relates to a method for evaluating keff uncertainty caused by nuclear cross section deviation, and belongs to the technical field of nuclear data evaluation. The method comprises the following steps: S1, selecting nuclides needing to be evaluated in a nuclear system to be analyzed; S2, selecting a nuclear cross section, which needs to be evaluated, of each nuclide; S3, respectively calculating the sensitivity of each nuclear cross section selected in the step S2; S4, selecting covariance data corresponding to each kernel cross section, and adjusting or estimating the covariance data; S5, respectively calculating the uncertainty Unck of each covariance matrix to the keff; and S6, calculating the uncertainty Unc of the keff caused by the nuclear cross section deviation of the nuclear system. According to the method provided by the invention, the influence of each covariance matrix on the keff uncertainty is calculated through the nuclear cross section sensitivity data and the covariance data, so that the uncertain value of the keff caused by the nuclear cross section deviation can be quantitatively obtained, and design, analysis and evaluation can be guided.

Description

technical field [0001] The invention belongs to the technical field of nuclear data evaluation, in particular to a method for evaluating the uncertainty of keff caused by nuclear cross-section. Background technique [0002] When evaluating the critical safety characteristics of a nuclear system, it is necessary to evaluate the uncertainty caused by various factors of the nuclear system, among which the uncertainty caused by the nuclear cross section is a very important aspect. Since the nuclear cross section will have a certain deviation in the measurement process, and according to its measurement principle and method, there will be a certain correlation between the deviation between different energy groups, different sections and even different nuclides. The overall deviation of the cross-section evaluation results will also cause the overall deviation of the keff (effective proliferation factor) calculation results based on the nuclear cross-section data. Therefore, it is ...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F17/16G06F111/10
CPCG06F30/20G06F17/16G06F2111/10
Inventor 李云龙易璇霍小东杨海峰于淼胡小利陈添李想邵增
Owner CHINA NUCLEAR POWER ENG CO LTD
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