High-adaptability multi-phase particle dispersion type fuel element temperature field calculation method

Abstract

A high-adaptability multi-phase particle dispersion type fuel element temperature field calculation method mainly comprises the following steps of: 1, establishing and setting a geometric simulation model of a fuel element and multi-phase dispersion particles; 2, importing control flow engineering software into the set geometric simulation model; 3, calculating an element temperature field at the current moment; 4, dividing to obtain element sub-regions; 5, calculating and storing the average temperature of the sub-regions; 6, using numerical simulation software to modify representative particle parameters and calculate a temperature field; 7, storing the heat conductivity of the particles and the base material of each sub-region; 8, calculating equivalent thermal conductivity of an element fuel area by using the theoretical model; 9, correcting the heat conduction parameters of the element; and 10, repeating the steps 3-9 until the end of the moment. According to the high-adaptability calculation method, the relation between the temperature field of the element and the temperature field of the dispersion particle can be established, real-time parameter mutual transmission is achieved, data of the heat conduction performance of the element is updated, and therefore the fuel element temperature field can be evaluated more effectively and accurately.

Description

technical field [0001] The invention relates to the field of performance analysis of nuclear reactor multi-phase dispersion type fuel elements, in particular to a calculation method for the temperature field of multi-phase particle dispersion type fuel elements with high adaptability. Background technique [0002] Multiphase dispersed fuel element is a new type of fuel formed by dispersing nuclear fission materials in a metal, ceramic or graphite matrix. It has the advantages of high uranium utilization efficiency, anti-proliferation, good thermal conductivity, and a wide range of material choices. It has been used in research and test reactors, pebble bed high-temperature gas-cooled reactors, and pressurized water reactors, and is expected to be applied in the field of nuclear waste treatment. [0003] Due to the large difference in response to temperature and radiation of various structural components of multiphase dispersed fuel elements; at the same time, the internal th...

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Problems solved by technology

A large number of theoretical models are limited to constant two-phase composite materials, and have their own scope of application; for the analytical solutions to solve specific problems, when the physical equations contain variable physical parameters, the equations are very difficult to solve; in addition, due to the special nature of nuclear reactors There are few related experiments, and the experimental objects cannot involve all the designs of diffused fuel elements

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