Radiation shield calculation method based on coupling of Monte Carlo method and characteristic line method

Abstract

The invention discloses a radiation shield calculation method based on coupling of a Monte Carlo method and a characteristic line method. Through the coupling of the Monte Carlo method and the characteristic method, the Monte Carlo method is adopted at a radiation source area complex in geometry for simulation and the non-uniform amendatory characteristic line method is adopted in a shield layer area simple in geometry for simulation to obtain distribution result of radiating particle flux in the shield layer, wherein the Monte Carlo method has the advantages of being capable of accurately simulating the transporting process of particles in multi-dimensional complex geometry, and the characteristic line method has the advantages of being small in limit to calculation models, fast in calculation speed, free of ray effect, and capable of obtaining high-accuracy calculation results. Compared with a traditional shielding calculation method, the radiation shield calculation method based on the coupling of the Monte Carlo method and the characteristic line method are capable of penetrating a shield area deeply to obtain better geometry adaptability, higher calculation efficiency and more accurate calculation accuracy.

Description

technical field [0001] The invention relates to a method for calculating radiation shielding based on the coupling of a Monte Carlo method and a characteristic line method, and belongs to the research field of radiation transport and numerical calculation simulation in nuclear science. Background technique [0002] Radiation shielding calculation is mainly the process of using the particle transport calculation method to carry out particle transport simulation calculations for large-scale nuclear installations, thereby obtaining the radiation particle flux distribution in the biological shielding area of ​​nuclear installations. It can assist nuclear engineering designers to carry out nuclear installation Effective radiation shielding design and analysis. At present, particle transport calculation methods are generally divided into Monte Carlo methods and deterministic methods. The Monte Carlo method is based on the statistical theory and obtains the particle flux density t...

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Problems solved by technology

[0003] The advantage of the Monte Carlo method is that it can more realistically describe the characteristics and processes of things with random properties, and has small restrictions on geometry and materials, and can accurately simulate complex materials and particle transport problems under complex geometries; its disadvantage is that The calculation is time-consuming and the convergence speed is slow. In particle transport problems, the calculation results are related to the size of the system. For the calculation problems of large systems or small probability events, the calculation results are often lower than the real value, especially for large nuclear installations. When shielding calculations, it is easy to produce deep penetration effects and cannot obtain accurate calculation results

The biggest advantage of the deterministic method is that the calculation convergence speed is fast; but its disadvantage is that there is a certain degree of geometric restrictions, and it is difficult to deal with large complex geometric models

[0004] Traditional radiation shielding calculation methods are usually based on a single Monte Carlo method or a deterministic method, so the shortcomings of the two methods seriously limit their application in radiation shielding calculations for large and complex nuclear installations (such as ITER models, IFMIF installations)

It is difficult to obtain accurate results for large-scale shielding areas in the shielding calculation of the Monte Carlo method, the statistical error is large, and the convergence speed is slow, and the calculation is time-consuming; while the deterministic method has certain geometric limitations, it is difficult to deal with large-scale complex nuclear devices. Radiation Shielding Calculation Issues

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