Method for researching eutectic reaction and high-temperature melting behaviors in reactor core by using particle grid mixing method

Abstract

The invention discloses a method for researching eutectic reaction and high-temperature melting behaviors in a reactor core by using a particle grid mixing method. The method mainly comprises the following steps of: 1, setting initial arrangement of particles for specific problems; 2, performing mesh generation on the initial particle position; 3, solving a mass diffusion equation and an energy equation by using a finite volume method to obtain a mass and temperature solution of a next time layer; 4, solving a momentum equation by using a moving particle semi-implicit method to obtain the positions and speeds of the particles; 5, iteratively solving the steps 2-4 until a result at the required moment is obtained through solving; and 6, outputting a calculation result, and carrying out post-processing to obtain heat distribution, melt distribution and melt migration conditions in the reactor core. The method disclosed by the invention has the advantages of accurately processing the freesurface and simulating the phase change by adopting the moving particle semi-implicit method, has high precision of calculation by adopting the finite volume method, can be used for researching the melting process of the reactor core, and provides an important basis for researching the early melting safety characteristic of the reactor core in serious accidents of the nuclear power plant reactor.

Description

technical field [0001] The invention relates to the technical field of research on eutectic reaction and high-temperature melting behavior characteristics in a nuclear power plant severe accident core, in particular to a method for studying eutectic reaction and high-temperature melting behavior in a reactor core by using a particle grid mixing method. Background technique [0002] Recently, my country's nuclear power has developed rapidly. In order to change my country's existing energy structure, ease the pressure on the environment, and achieve emission reduction targets, the country has formulated a huge medium- and long-term development plan for nuclear power. The Fukushima nuclear power plant accident in Japan sounded the alarm for the safety of nuclear power in my country. After the accident, the Chinese government attaches great importance to the safety of nuclear power in our country. Carrying out research on the mechanism and key technologies of severe accidents ...

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Problems solved by technology

[0006] In order to overcome the inaccurate problems of mass diffusion calculation and heat transfer calculation existing in the calculation of the eutectic reaction and high temperature melting behavior in the core by the semi-implicit method of moving particles, the present invention provides a method of using the particle-grid mixing method to study the in-core The method of eutectic reaction and high-temperature melting behavior, this method can study the eutectic reaction and high-temperature melting behavior in the core with multi-phase state, multi-free surface and mass diffusion, and obtain the heat distribution, Melt distribution and melt migration, revealing reactor core fuel melting and melt expansion behavior, providing technical support for nuclear power plants to formulate comprehensive severe accident link strategies

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