Analysis of Hydrogen Transport Operation Under Multiple Drive Sources in Containment

Abstract As a kind of clean energy, nuclear energy has great development potential and application prospects, but we must take into account the possible harm to the environment and society caused by radioactive material leakage. Therefore, the integrity of the containment vessel, which is the third and final barrier against the release of radioactive materials, must be effectively guaranteed. When a water loss accident occurs in a nuclear reactor and causes a serious accident, a large amount of steam will be released from the pipe breach, and hydrogen will be released into the large space of the containment vessel due to the zirconium-water reaction. When the concentration of hydrogen reaches a certain level, explosion may occur, seriously damaging the integrity of the containment. In this paper, a full-scale model of the containment vessel and its key equipment is established by means of numerical simulation to analyze the transport and diffusion behavior of hydrogen under the action of multiple driving sources such as heat exchangers and breaks. The results show that the sedimentation effect caused by the condensation of water vapor on the surface of the heat exchanger will affect the transport direction of the surrounding hydrogen, and the existence of compartments will also hinder the flow of hydrogen. The accumulation of hydrogen in large space can be effectively alleviated by optimizing the design of compartments.