Numerical simulation of high-pressure tritium leakage based on AN-EOS model

[Background] Tritium leakage is a typical nuclear accident scene, which is harmful to human and environment. Therefore, numerical simulation of tritium leakage is of significance to nuclear accident emergency decision making. [Purpose] This study aims at the numerical simulation of high-pressure tritium leakage. [Methods] A numerical simulation method based on AN-EOS model was proposed to solve the problem of tritium leakage from high pressure storage vessels. The AN-EOS model embedded into Fluent by user defined functions was used to describe the tritium leakage transient behavior. The leakage process of tritium and variation rule of concentration were simulated in closed and ventilated environment based on Fluent. [Results] The results show that the concentration of tritium increases rapidly when the leakage occurs. After stopping leakage, the concentration of tritium in a closed environment increases first and then stabilizes, and gradually decreases in ventilated environment. [Conclusions] Ventilation has a significant effect on the diffusion of tritium gas, which can effectively achieve the purpose of tritium removal. © 2022 Science Press. All rights reserved.