Calculation method for non-fuel burnable poison burn-up in reactor

Abstract

The invention discloses a calculation method for non-fuel burnable poison burn-up in a reactor. The calculation method includes the steps that (a), total power is input for burn-up calculation in the reactor; (b), power and flux of all burn-up regions are distributed; (c), constant power burn-up calculation is adopted for a fuel region, and constant-flux burn-up calculation is adopted for a non-fuel burnable poison region. The mixed burn-up calculation mode based on the Monte Carlo method is adopted; for the fuel region, the constant power mode is adopted for burn-up; for the ultra-low power regions of non-fuel burnable poison, thorium-base fuel and others, the constant-flux mode is adopted for burn-up. The application range of burn-up calculation based on the Monte Carlo method is enlarged, and the method can be used for performing processing including burning calculation on the ultra-low power regions of the non-fuel burnable poison, the thorium-base fuel and others. The calculation amount is not added, so that unnecessary approximation is avoided, burn-up calculation is performed directly according to the actual power level, and the confidence coefficient of the burn-up level is guaranteed.

Description

technical field [0001] The invention relates to the burnup calculation setting of combustible poisons and new fuels in a reactor, in particular to a calculation method for the burnup of non-fuel combustible poisons in a reactor. Background technique [0002] The burnup calculation based on the Monte Carlo method has two modes of constant power or constant flux, and the fuel consumption calculation is generally performed according to the input rated power in the reactor. However, various burnable poisons may be used in the core: they can be divided into dispersed type, coated type and separated type, and the latter two types do not contain fuel, so they can be called non-fuel burnable poisons; There is almost no power in the burn-up zone, so this type of burnable poison cannot be burned up in the constant power mode. In addition, some fuel areas in the new core, such as the thorium-based fuel used for breeding, do not contain fissile nuclides at the beginning of the life, an...

AI Technical Summary

Problems solved by technology

It can be seen that the current processing method has defects: the two calculation methods cannot be used accurately and rationally, so that the respective defects cannot be avoided, the applicability is low, and the power statistics are not accurate; Normal flux mode, which increases the amount of additional calculations

Images