Metal fuel multi-physical field model coupling method for metal cooling fast reactor

Abstract

The invention discloses a metal fuel multi-physical field model coupling method for a metal cooling fast reactor. The method includes the following steps: S1. establishing a metal fuel multi-physicalfield coupling model in an irradiation process in COMSOL and coupling, and solving the model in the COMSOL to acquire a change value of an outermost temperature of a fuel core body with time in the early irradiation period of the metal fuel; S2. deriving the change value of the outermost temperature of the fuel core body with time, fitting the outermost temperature of the fuel core body by a leastsquare method to acquire a temperature function; S3. removing a gap coolant heat transfer model in the metal fuel multi-physical field coupling model, taking the outermost temperature function of themetal fuel as a boundary condition of the fuel core heat transfer model, and solving the model to acquire a metal fuel irradiation performance parameter in the whole irradiation process. As a metal fuel irradiation behavior model is introduced into the field of metal fuel performance analysis and simulation simulation through a strong coupling mode based on a COMSOL multi-physical field couplingsimulation platform, the accurate simulation of the metal fuel irradiation behavior is realized.

Description

technical field [0001] The invention relates to the technical field of performance analysis and simulation of advanced fast reactor metal fuel, in particular to a multi-physical field model coupling method for metal-cooled fast reactor metal fuel. Background technique [0002] In recent years, in order to reduce the pressure on the storage of radioactive waste in LWR fuel, there has been strong international interest in the development of fast neutron reactors. Fast neutron reactors can burn long-lived actinides in LWR spent fuel to reduce nuclear waste. long-term radiation. As one of the fourth-generation reactors, metal fast reactors can incinerate long-lived actinide nuclides left over from thermal reactors, and can realize the proliferation of fissile materials while generating energy. The metal fuel for metal cold fast reactors, namely uranium-zirconium alloy (U-Zr) or uranium-plutonium-zirconium alloy (U-Pu-Zr) has the advantages of stronger proliferation and better s...

AI Technical Summary

Problems solved by technology

However, COMSOL cannot handle the complete disappearance of the solution domain during the simulation calculation, which leads to an error when the gap coolant in the fuel core and cladding is completely squeezed out of the gap due to core expansion when simulating the early behavior of fuel irradiation and terminate the calculation, it is impossible to simulate the performance change of the metal fuel throughout the irradiation process

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