Multi-scale coupling method and device for layered burnup of dispersion fuel and poison particles

Abstract

The invention discloses a multi-scale coupling method and device for layered burnup of dispersion fuel and poison particles. The method comprises the steps of: constructing a microscopic fine model according to geometric parameters of a rod bundle lattice cell model; carrying out neutron transport calculation on the microscopic fine model to obtain effective multiplication factors of the microscopic fine model; mixing poison particle balls with SiC matrices according to the effective multiplication factors to obtain a microscopic equivalent uniform model and effective shares of the poison particle balls; taking the rod bundle lattice cell model as a macroscopic model, and mixing poison particle balls and the SiC matrices in fuel rods according to the effective shares to obtain effective multiplication factors and average flux of the fuel rods; carrying out burnup calculation according to the effective multiplication factors and the average flux, counting important burnup data such as N, n, and phi, and achieving multi-scale coupled burnup calculation. According to the invention, a macroscopic rod bundle lattice cell model is mixed according to the microcosmic equivalent uniform model, the calculation efficiency is improved, and the method can be widely applied to the field of nuclear engineering.

Description

technical field [0001] The invention relates to the field of nuclear engineering, in particular to a multi-scale coupling method and device for stratified burnup of dispersed fuel and poison particles. Background technique [0002] In the process of safe operation of the reactor, the control of reactivity is particularly important; the setting of combustible poison plays an important role in the control of reactivity, it is beneficial to reduce the initial reactivity at the beginning of the reactor life, and plays an important role in the unattended control of the reactor . [0003] All-ceramic micro-encapsulated dispersed fuel is a new type of accident-resistant fuel, which disperses coated fuel particles in the matrix, and it has the advantages of relatively high burnup depth, good containment and heat transfer performance. Among them, the addition of dispersed burnable poison particles to FCM fuel enables long-term and flexible control of the reactivity process without p...

AI Technical Summary

Problems solved by technology

In existing methods, in order to accurately restore the layered phenomenon of poison particles, the structure of poison particles needs to be further subdivided, resulting in a huge amount of grid calculation and a heavy computational burden. It is unrealizable in the calculation; and the fuel particles dispersed in the matrix are different from the poison particles, there is no such layering phenomenon, and there is no need for too fine division, but they still have double heterogeneity, which needs to be dealt with separately

[0005] The matrix is ​​mixed with a variety of complex structures such as coated fuel particles and burnable poison particles and their corresponding characteristics. Therefore, in the process of dealing with the stratified burnup effect of burnable poison particles in all-ceramic microencapsulated fuel (FCM), At present, there is a lack of efficient and high-fidelity solution methods

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