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Fission reactor criticality calculation system based on Monte Carlo method

A computing system and reactor technology, applied in the field of critical computing systems based on Monte Carlo fission reactors, can solve problems such as calculation deviations, calculation errors, and low-efficiency calculations of the effective multiplication factor keff, and achieve improved critical computing efficiency and excellent scalability , the effect of high degree of automation

Active Publication Date: 2015-05-06
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0002] In the critical calculation of Monte Carlo fission reactor, the effective multiplication factor keff calculation of the reactor is divided into active generation and inactive generation; Enter the inactive generation calculation, otherwise it will lead to the calculation deviation of the effective multiplication factor keff; the existing Monte Carlo software at home and abroad generally use the user to manually set the inactive generation. Low-efficiency calculations may even cause calculation errors; for fast-converging test examples, setting too many inactive algebras will cause waste of calculation time; for slow-converging test examples, setting too few inactive algebras will cause Effective value-added factor keff calculation deviation

Method used

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  • Fission reactor criticality calculation system based on Monte Carlo method
  • Fission reactor criticality calculation system based on Monte Carlo method
  • Fission reactor criticality calculation system based on Monte Carlo method

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example

[0042] XEntropy value="1 2 3 4" num="2 3"

[0043] In the example, the grid on the x-axis is divided into: 1 to 2 are divided into 2 grids with equal distances, and 3 to 4 are divided into 3 grids with equal distances;

[0044] Shannon entropy value calculation module: Calculate the Shannon entropy value of each generation according to the Shannon entropy calculation formula; the specific implementation is as follows:

[0045] 1. The x-axis is divided into n 1 grids, divided into n on the y-axis 2 grids, divided into n on the z-axis 3 grids, the whole area is divided into n 1 ×n 2 ×n 3 ;

[0046] 2. Calculate the ratio of the number of fission sources in each grid to the total number, denoted as P J ;

[0047] 3. Calculate the Shannon entropy value of each generation according to the formula:

[0048] H src = - Σ J = 1 N ...

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Abstract

The invention relates to a fission reactor criticality calculation system based on a Monte Carlo method. The fission reactor criticality calculation system comprises a grid numerical analysis module, a shannon entropy calculation module and a shannon entropy evaluation module. The system is implemented through the following steps of: firstly, resolving grid partition information filled in an input file by a user, then calculating shannon entropy of each generation according to a shannon entropy calculation formula, performing numerical correction on a shannon entropy curve, quantitatively giving algebra required by system source convergence, and automatically regulating non-active generation algebra in the system, wherein the shannon entropy evaluation module fits a shannon entropy curve according to the least square method, judges the algebra required by convergence by use of the corrected shannon entropy according to convergence condition, and then sets the non-active generation algebra of the system. According to the fission reactor criticality calculation system based on the Monte Carlo method, the restriction that the non-active generation algebra of a traditional fission reactor criticality calculation system is manually set by a user is changed, and the efficiency of calculating the fission reactor criticality by use of the Monte Carlo method is improved.

Description

technical field [0001] The invention belongs to the field of Monte Carlo fission reactor criticality calculation, and relates to a Monte Carlo fission reactor criticality calculation system, which is used for automatically setting inactive algebras in criticality calculation. Background technique [0002] In the critical calculation of Monte Carlo fission reactor, the effective multiplication factor keff calculation of the reactor is divided into active generation and inactive generation; Enter the inactive generation calculation, otherwise it will lead to the calculation deviation of the effective multiplication factor keff; the existing Monte Carlo software at home and abroad generally use the user to manually set the inactive generation. Low-efficiency calculations may even cause calculation errors; for fast-converging test examples, setting too many inactive algebras will cause waste of calculation time; for slow-converging test examples, setting too few inactive algebra...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 严雅雯郑华庆宋婧郝丽娟吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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