Method for manufacturing fusion reactor multi-group shielding database based on Monte Carlo method

Abstract

The invention discloses a method for manufacturing a fusion reactor multi-group shielding database based on a Monte Carlo method. The method comprises the following steps: 1, processing an evaluation nuclear database into a continuous energy ACE format nuclear database; 2, adding information in all scattering reaction channels of each nuclide in the ACE format database to obtain a continuous energy scattering response coefficient database; 3, designing a simplified one-dimensional model according to the real three-dimensional structure of the fusion reactor; 4, calculating a simplified model based on the ACE format database and the continuous energy scattering response coefficient database by adopting a Monte Carlo method; 5, obtaining a multi-group high-order scattering cross section according to the obtained low-order flux, high-order flux and high-order scattering reaction rate; and 6, combining the multi-group high-order scattering cross section with the total cross section, the neutron generation cross section, the absorption cross section, the low-order scattering cross section and the response function library in the multi-group shielding database to generate a new fusion reactor multi-group shielding database. According to the database, fusion reactor radiation shielding calculation is more accurate, and the safety margin is reduced.

Description

technical field [0001] The invention relates to the fields of particle transport calculation and radiation shielding calculation, in particular to a method for preparing a fusion reactor multi-group shielding database based on a Monte Carlo method. Background technique [0002] In the fusion reactor design process, the radiation shielding calculation of the core and building is a key task. The current radiation shielding calculation adopts two mainstream methods: Monte Carlo method based on continuous energy database; deterministic method based on multi-group shielding database. The basic idea of ​​the deterministic method is to discretize the space, angle and energy, solve the discretized particle transport equation, and use the discrete grid distribution to approximate the continuous distribution. [0003] When using the deterministic method to solve the particle transport equation, the exit angle of the particle after each scattering can be processed according to the met...

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Problems solved by technology

First, the dimensions of high-order scattering reaction rates are more than those of other reaction rates. Under the same calculation conditions, the statistical fluctuations of high-order scattering reaction rates are larger and it is more difficult to converge

Second, in theory, the high-order scattering cross section should be obtained based on the high-order flux, but the current traditional statistical method is still based on the low-orde

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