Multi-dimension coupling simulation method for irradiation damage of nuclear reactor material

Abstract

The invention relates to a multi-dimension coupling simulation method for irradiation damage of a nuclear reactor material. According to the method, by combining MD, KMC and CD methods, the respectiveadvantages are achieved, MD is used for simulating a cascade collision process, a simulation result is used as input of KMC, the KMC is used for simulating an annealing process of a cascade defect, asimulation result is used as input of CD, the CD is used for simulating a long-time evolution process of the cascade defect, large-space-time-dimension simulation from defect generation to microcosmic structure representation can be achieved, and accordingly material performance prediction under the service condition is achieved. According to the multi-dimension coupling simulation method, the limit of a single dimension is broken through, long-time and large-scale simulation from atom dimension defect generation of the irradiation damage of the nuclear reactor material to microcosmic structure representation is achieved, the irradiation damage mechanism of the nuclear material can be deeply known, and evolution of a microcosmic structure of an irradiation induction material is predicted.

Description

technical field [0001] The invention relates to a computer simulation technology for nuclear material radiation damage, in particular to a multi-scale coupling simulation method for nuclear reactor material radiation damage. Background technique [0002] The service performance of key component materials in nuclear reactors (such as: pressure vessels, reactor internals, fuel cladding, etc.) directly affects the safety and economy of nuclear reactors. Structural materials are irradiated by high-energy neutrons during service, which impacts lattice atoms, resulting in cascade collisions that cause initial damage defects. Under the action, after long-term diffusion and aggregation to form microstructures such as defect clusters, precipitates, pores, bubbles, and dislocation rings, they interact with dislocations and grain boundaries in the material. Radiation) will eventually cause changes in the macroscopic properties of materials, mainly manifested as radiation embrittlement...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-scale coupled simulation that combines molecular dynamics, kinetic Monte Carlo and cluster dynamics methods to address the limitations of single-scale simulations in current multi-scale simulations of radiation damage to nuclear reactor materials Method, by coupling three simulation methods of different scales in series, with

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