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Method for evaluating the effect of nuclide content on keff uncertainty using the monte carlo method

A Monte Carlo method and deterministic technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of high calculation conservatism and long calculation time

Active Publication Date: 2018-12-21
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology

However, due to the particularity of the nuclear criticality system, as well as the long time-consuming calculation of the traditional Monte Carlo method and the high requirements for calculation conservatism, it is necessary to improve the assessment process of the traditional Monte Carlo method to meet the uncertainty assessment requirements of the nuclear criticality system. Applicability requirements

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  • Method for evaluating the effect of nuclide content on keff uncertainty using the monte carlo method
  • Method for evaluating the effect of nuclide content on keff uncertainty using the monte carlo method
  • Method for evaluating the effect of nuclide content on keff uncertainty using the monte carlo method

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Embodiment Construction

[0060] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0061] Exemplary present invention uses Monte Carlo method to assess nuclide content to k eff The flow of the method affected by the uncertainty is as follows figure 1 shown, including the following steps.

[0062] (1) Experimental verification

[0063] Use the burnup simulation program to verify the experimental data, and compare the measured value of the nuclide composition content given in each experimental data with the calculated value of the nuclide composition content simulated by the burnup program.

[0064] The following formula is used to calculate the ratio of the measured value of the nuclide content to the calculated value of the nuclide content:

[0065]

[0066] in:

[0067] is the ratio of the measured value of the nuclide content of the jth sample of the nth nuclide to the calculated value of the nuclide ...

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Abstract

The invention belongs to the technical field of nuclear safety evaluation, and relates to a method for evaluating the influence of nuclide content on keff uncertainty by Monte Carlo method. The methodis based on the Monte Carlo method and comprises the following steps of: (1) experimental verification: the experimental data are verified by using a fuel consumption simulation program, and the measured value of the nuclide composition content given in each experiment is compared with the calculated value of the nuclide composition content simulated by the fuel consumption program; (2) determining the distribution of the verification results of each nuclide and adjust the standard deviation of the mean value; (3) performing Monte Carlo sampling calculation; (4) performing statistical analysis of the results of sampling calculation; (5) determining the total uncertainty. The method for evaluating the effect of nuclide content on the keff uncertainty by using the monte carlo method of theinvention can make the calculation of the critical limit value in the nuclear critical analysis more accurate.

Description

technical field [0001] The invention belongs to the technical field of nuclear safety evaluation, and relates to a method for evaluating nuclide content versus k by Monte Carlo method. eff Methods of Uncertainty Effects. Background technique [0002] In criticality analysis and criticality design of nuclear criticality systems, the effective value-added factor k eff Plays a very important role, and the evaluation of its uncertainty is of great significance to the determination of nuclear critical safety limits. [0003] Effective value-added factor k eff The sources of uncertainty mainly include: [0004] (1) The uncertainty of the calculation method and calculation process, including the uncertainty of fuel consumption calculation and critical calculation; [0005] (2) The uncertainty of the model, including the simplification of the model and the uncertainty of manufacturing tolerances, etc.; [0006] (3) Uncertainty of data, including nuclear section data, uncertaint...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 李云龙易璇霍小东杨海峰邵增于淼
Owner CHINA NUCLEAR POWER ENG CO LTD
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